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My Huron River (Arms Creek)

One of the perks of my job as a co-director of the Adopt-a-Stream program at HRWC is that I get to see places that many others miss out on.  And so while I love the main branch of the Huron River and spend many hours at our metroparks, I decided to focus on a small creek in Webster township– Arms Creek.

An HRWC volunteer explores Arms Creek.

An HRWC volunteer explores Arms Creek.

Arms Creek at the intersection of Walsh Road is known internally here at HRWC as “Adopt-a-Stream Site Number 1″, meaning that it was the first site to be picked as a part of the program way back in 1992.  The watershed council and our many volunteers have been visiting this location and collecting information on this creek for 23 years! The creek contains many insect families that are sensitive to pollution and their presence tells us that the creek has good water quality.  In fact, the insect population has been getting better over time, so conditions here have improved over the past 20 years.  A thick riparian zone of trees and shrubs provides ample shade for the creek and plentiful groundwater inputs keep the water quite cold.  Many decades ago, the DNR actually stocked Arms Creek with trout, which is very rare for the Huron Watershed, but not enough fisherman utilized the creek to make this worth the cost. Last year HRWC staff wrote a creekshed report for Arms Creek, which can be found here along with a clickable and zoomable map.

 

independence150

The shores of Independence Lake

The Arms creekshed also contains Independence Lake, a beautiful county park located only a few miles from my
house and a spot that my family visits many times during the year. In the summer it is our go-to spot for swimming and waterslides, and in the other seasons we play on the playground and take walks through wetlands and fields. Winter is a great time to visit as the park is all but deserted.  Last winter we spent a long time throwing rocks onto the lake and listening to the musical “plunk-plink-plunk-pppppppp” of the rocks echoing and reverberating against the ice.

independence151

“More rocks, Daddy. More rocks!”

Sunshine, bugs, and volunteers

Now that is a lot of sunshine!

Now that is a lot of sunshine! credit: Kristen Baumia

People enjoying nature!

We could not have asked for better spring weather for our 120 volunteers on April 18!  They soaked in the sun and warmth while visiting 50 different creek and river locations across the Huron River Watershed. Held twice a year, HRWC’s River Roundup is one of the most effective ways that HRWC has to understand how the water quality of the river and creeks may be changing. From the macroinvertebrates collected during this event, we are able to keep abreast of the health of our waterways throughout the watershed. You can see all the results in April 18 River Roundup Report.

Highlight

Mill Creek is the largest tributary to the Huron River, draining  143 square miles of land, 68 of which are agriculture. Agricultural impacts have certainly taken their toll on Mill Creek, with some Mill Creek’s tributaries no more than straightened ditches, and the creek has phosphorus and E.Coli issues that come from fertilizers and animals. However, great things are happening in Mill Creek, including the removal of Mill Pond Dam in Dexter, stream stabilization projects, landowner education, and a renewed interest in bringing residents to the waterfront. 

Changes in the EPT families on Mill Creek, Shield Road. The red line shows the Mill Pond Dam removal.

Changes in the EPT families on Mill Creek, Shield Road. The red line shows the Mill Pond Dam removal.

As a part of the River Roundup, volunteers regularly visit 9 sites on Mill Creek (the main branch and several tributaries).  Four of these sample sites are showing significant improvements in the macroinvertebrate populations, indicating improving water quality and habitat.  These four sites are Shield Road (near the mouth), Manchester Road and Klinger Road (both in the headwaters), and Fletcher Road (on the north branch).

Shield Road in particular seems to be doing quite well with several highly diverse samples taken since the removal of the downstream dam.  The graph to the right shows the changes in the EPT (mayfly-stonefly-caddisfly) family diversity, with the red line in the middle of the graph indicating the dam removal. Samples in the early 2000′s were particularly poor with only 2 or 3 families found, and now we are regularly finding  6 or 7. Insect families that are now found which were not found previously include Baetid mayflies, Isonychia mayflies, Leptophlebia mayflies, and the Philopotamid caddisfly.

You can learn more about Mill Creek from our creekshed report.

Lowlight

South Ore Creek has fewer insects than we would expect despite areas of great habitat. When this happens, the likely culprit is some type of chemical pollutant.

South Ore Creek has fewer insects than we would expect despite areas of great habitat. When this happens, the likely culprit is some type of chemical pollutant.

If you have read these updates before, you will recall that we have learned that several streams in Livingston County have had significant reductions in their insect populations over time.  In fact, of the 62 sites that we monitor across the Huron River Watershed, 20 are in Livingston County, and 9 of those have statistically significant reductions. In contrast, HRWC monitors 30 sites in Washtenaw County and the insects at 12 sites are statistically improving while zero are declining.  Now, this may simply be a coincidence, as it is difficult to explain why a political boundary can make such a difference in insect populations.  But the data speaks pretty clearly; among others, Davis Creek (South Lyon area) has been declining, and South Ore Creek (Brighton area) is also getting worse.  Thankfully, both of these creeks could still be considered relatively healthy (when compared to more heavily urbanized creeks like Malletts), but we have to make some extra efforts to get these creeks to reverse their negative trends.

 

What’s next?

You should be a creekwalker! In this unique program, you will walk up and down a stream, exploring it and looking for possible pollution sources.  Join by yourself, with friends, or with your family.  Learn more about it at http://www.hrwc.org/volunteer/creekwalker/.

New study links coal-tar sealed pavement to death of aquatic organisms

Numerous studies on coal-tar based asphalt sealcoats have linked this product to human health problems and ecological damage (learn more about the issue in this recent blog and this newsletter article, page 7).  HRWC would like municipalities and homeowners to refuse to use coal-tar based sealcoats because of their environmental effects, and a recent study released by the U.S. Geological Survey gives us all another reason to do so.

A fathead minnow, one of the aquatic species used to determine coal-tar toxicity in this study.

A fathead minnow, one of the aquatic species used to determine coal-tar toxicity in this study.

In this study, researchers applied coal-tar sealcoat to a section of a parking lot, and simulated rain-falls and collected the water runoff both 3 days and 36 days after sealcoat application.  Two common aquatic species (fathead minnows and cladocerans) were exposed to the run-off.  A 1:10 dilution of the run-off (which would be an approximation of conditions in moderately urban streams and ponds) caused a 10% mortality of the fathead minnow and a 60-100% mortality of the cladocerans, with the length of time after sealcoat application not making a difference.

There is much more to this study including looking at the effects of ultraviolet light, alternative sealcoat products, control treatments, and differing treatment lengths.  However, based on the one part of the study given above, it is clear that coal-tar sealcoat is producing toxic rain run-off. Secondly, the sealcoat continues to cause the death of aquatic life 36 days after application (and perhaps further, but this was not included in the study). Application guidelines of coal-tar sealcoat  state that the sealcoat should not be applied if rain is forecast within 24 hours to allow the product time to cure, but after this period the “risk level of runoff drops close to inconsequential.” This study reveals these application guidelines are incorrect.

Readers are welcome to check out the study for themselves; it is technical but not impossible to read. It is also copyright free, so HRWC is able to give the journal article here.

 

The River Roundup is April 18!

Kids and adults welcome! Photo by Rick Martin

Kids and adults welcome! Photo by Rick Martin

Find insects, crayfish and other small river creatures as a part of the River Roundup!

Join a small team with your friends and family for a unique activity and (hopefully) some time in gorgeous spring weather! Collect a sample of the bugs and other creatures that live in our streams.  Like canaries in a coal mine, these creatures indicate the health of our creeks and rivers.  In healthy places, the amount of life  in these fresh water systems is amazing! 

All volunteers first meet in Ann Arbor, and then trained volunteer leaders take you to two stream sites, where you help them search through stones, leaves, and sediment.  Only trained volunteers go in the water.  Dress to be in the field for a couple hours.   You must register early to participate.

Children are welcome to attend with an adult.

WHERE: Meet at the HRWC office in Ann Arbor.  Then car pool to two streams in Livingston, Oakland, Wayne and/or Washtenaw Counties.

WHEN: Two times: April 18, 2015 from 9:00 AM to 3:30 PM, or 10:30 AM to 5 PM

DEADLINE: Registration closes on April 15, 2015.

NEXT STEPS: Fill out the registration page for the time and general area that you desire to work in.

1. 9 AM. Washtenaw and Livingston Counties

2. 9 AM. Belleville and Flat Rock

3. 9 AM. Western Washtenaw and Livingston Counties.

4. 9 AM. Oakland County.

5. 10:30 AM. Washtenaw and Livingston Counties. 

MORE INFO: Please email Jason at jfrenzel@hrwc.org.

PHOTOS and STORY: Get a sense of what this event is like from a HRWC volunteer here.

 

 

Stoneflies! Cute AND educational!

Stonefly Search 2015 Wrap Up

A Surprisingly Pleasant January Day
So cute! Who wouldn't want to spend a cold Saturday in January looking for one of these?

So cute! Who wouldn’t want to spend a cold Saturday in January looking for one of these?

You never know what a Michigan January will bring; last year HRWC was forced to cancel the Stonefly Search because of sub-zero temperatures and blizzard conditions.  But this year, on January 17, 125 intrepid volunteers enjoyed bright sunshine and 30 degree weather as they spread across the Huron River watershed. They were in search of stoneflies, which are only found in clean and healthy streams.  Everyone made it back safe, and not a single leaky wader was reported! Overall, it was a great success!

The results are in, and are given in this pdf report.

What We Found

1. Usually when we look at the data after an aquatic bug search, we see that some sites do better than normal, some sites do worse, but most sites stay the same. This was a strange year because while most sites stayed the same, several did worse than normal, and none did better.  Overall, the count of stonefly families was down about 10% from our last sampling event (2013). There is no clear explanation for this; weather conditions were great and the ice wasn’t any thicker than other year.  We will start to be concerned if we continue to see this happen year after year. However, there is always natural variation in the data and collecting and this year will likely not be the start of a downward trend in terms of the overall sampling.

 

Caroline, HRWC Intern and volunteer, scours Malletts Creek in hopes of scoring a Capnid.

Caroline, HRWC Intern and volunteer, scours Malletts Creek in hopes of scoring a Capnid.

2. That being said, there are specific locations that have shown long-term degradation. For example, Honey Creek in Ann Arbor. The team searching for stoneflies in Honey Creek at Wagner were unable to find stoneflies. This site has been sampled 14 times since 1995, and this is the first time that stoneflies could not be found. This is a site with lots of turbulent highly oxygenated water and should be a great place for stoneflies. Taken in isolation, the absence of the stoneflies at Wagner Road would not be concerning given that this is a single sample.  However, two upstream Honey Creek Adopt-a-Stream sites used to have stoneflies but haven’t in years.  Stoneflies haven’t been seen in Honey Creek at Jackson Road since 2008; they haven’t been at Honey Creek at Pratt Road since 2003. All of the pieces combined indicates that the overall quality of Honey Creek is degrading over the last decade.

3. Davis Creek at Pontiac Trail is another location where the stonefly population has dropped over time. This change is concerning because it happened slowly over the last ten years and our spring and fall samples show a very similar pattern.  In the early 2000s we regularly found one or two stonefly families at the creek, but they started to drop off and now have not been found since 2009.

4. All this doom and gloom needs to be put in perspective, though. Remember, most of the sites we visited were as healthy as ever.  Of the 61 Adopt-a-Stream sites that HRWC uses to assess the overall water quality of the watershed, stoneflies are regularly found at 38 of them. In other words, 62% of our watershed has very high water quality and habitat. This agrees with recent analyses of other HRWC data, showing that 66% of the watershed was good to very high quality, 28% was fair to good, and 7% was highly impacted (2014 State of the Huron)

Next on the horizon!

Interested in doing more with our macroinvertebrate searches?  Think about becoming a trained leader or collector by coming to the next training on March 29.  This is an extremely important job because every team needs both a trained leader and collector, and we often do not have enough to meet the demand.  Sign up for the training!

 

The team gathers around the white trays to sort debris and hunt for stoneflies!

The team gathers around the white trays to sort debris and hunt for stoneflies!

 

 

River Roundup Results Reviewed

Macroinvertebrate sampling on the Huron River and its creeks

Thanks to 128 volunteers who contributed approximately 650 volunteer hours, the October 2014 River Roundup was a great success!  The weather was a little dreary and chilly for our volunteers as they split into 24 teams and traveled to 48 different creek and river locations across the Huron River Watershed to assess the aquatic benthic macroinvertebrate community.  This study is one of the most effective ways that HRWC has to understand how the water quality of the river and creeks may be changing. From the data collected at this semi-annual event, we are able to keep abreast of the health of our waterways throughout the watershed. You can see all the results in October 14 River Roundup Report.

Also, in case you missed it, on November 13 the HRWC staff presented our data summaries of 2014 to a packed in crowd.  Jason discussed the broadening of HRWC’s volunteers and volunteer programming. I walked through a case study showing how our data and volunteer programming can be used to investigate pollution problems, and Ric explained how box and whisker graphs can show us water quality data. For those who couldn’t make it, here’s a PDF of the presentation. Let us know if you have any questions!

 

Current Watershed Health

In a nutshell, the health of the watershed as judged by our macroinvertebrate sampling is holding steady.  Of the 62 sites that we monitor to judge this, 28 sites have had no statistically significant changes over time, and 6 sites are too new to make this judgment.

Fourteen sites are declining, and these include locations on Chilson Creek, Davis Creek, east branch of Fleming Creek, Norton Creek, and South Ore Creek.  Eight of the declining sites are in Livingston County, two are in Washtenaw, and three are in Oakland.

Fourteen sites are significantly improving.  Twelve of the improving sites are in Washtenaw County, including Boyden Creek, Horseshoe Creek, the main and west branches of Fleming Creek, Huron Creek, the Huron River in Ann Arbor and Ypsilanti, Malletts Creek, and several places on Mill Creek. One site is improving in Livingston County (Mann Creek at Van Amberg Road), and 1 site is improving in Wayne County (Woods Creek at the Lower Huron Metropark).

Highlight

I’ve become a big fan of Arms Creek over the couple of years as I have learned more and more about it.  While possessing a rather mucky stream bed, the water is cold and heavily influenced by groundwater, the riparian zone is thick and undisturbed in many parts, and there is plenty of woody debris in the water. In fact, part of Arms Creek is actually in a Natural River Zone.  Also, many many years ago, the DNR stocked trout in Arms Creek because of the cold water temperature, which is a very rare thing for southeast Michigan. However, despite all of these great properties, the insect community has only ever been mediocre (probably due to the fine sand and muck dominating the streambed).

Kyle Fetters explored Arms Creek last summer with a group of U-M grad students through HRWC's Creekwalking program. credit: Nate Gainer

Kyle Fetters explored Arms Creek last summer with a group of U-M grad students through HRWC’s Creekwalking program. credit: Nate Gainer

Therefore I was very excited to see this fall’s sample was the best ever collected there since sampling started in 1994. Sixteen total insect families were found, with five of those members of the mayfly and caddisfly families, and 3 of the families classified as “sensitive”. Sensitive families are those that are first to disappear in disturbed or polluted conditions.  Finding three sensitive families is very good and usually only our best River Roundup sites have that many.

 

Lowlight

I have lowlighted Davis Creek before in this results blog, but the really poor results from this Roundup have prompted me to look into the issue again.  Both the Doane Road and Pontiac Trail sites had very poor macroinvertebrate samples; the worst seen in many years at both of these sites.  Both of these sites are on the main branch of Davis Creek, upstream from Sandy Bottom and Ten Mile Lake, on the outskirts of South Lyon.

To investigate the issue, I looked at the habitat data collected by our volunteers in the summer.  Both locations have good to excellent habitat, with good diversity of substrate, good riparian zones, and plenty of instream woody debris.  Furthermore, summer creekwalkers also explored two sections of this creek and also reported finding good habitat throughout.

Therefore, it is probable that there is something dissolved in the water, rather than poor habitat, that is reducing the macroinvertebrate diversity and abundance.  Our volunteers regularly take water samples during the River Roundup that we analyze for conductivity (a proxy for total dissolved solids, which includes inorganic or organic substances, naturally found and pollutants).  I plotted out conductivity over time and did indeed notice an increase of conductivity since 1994.  Conductivity is going up; bugs are going down.  A correlation like this does not prove anything especially given  the variability in the data, but it is an interesting clue.

Conductivity measurements in microsiemens/cm for the Davis Creek: Doane Road site.

Conductivity measurements in microsiemens/cm for the Davis Creek: Doane Road site.

As a followup, it could be useful to get a water analysis to determine the exact chemical constituents of Davis Creek. We may be dealing with herbicides or pesticides, or perhaps excessive chloride (from water softeners). There is also more of the creek to explore on foot, as there are some light industrial and residential areas that we have not visited yet.

What’s next?

Do you consider yourself a Michigander, or aspire to be one? Then you should brave the cold and join the Winter Stonefly Search on January 17.  It is like the River Roundup, only much snowier.  You can register for the event here.

Underwater Mussel Shenanigans

While doing a habitat assessment on the Huron River, I was lucky enough to see a pocketbook mussel in the process of attracting a fish host and managed to get some pictures and a video of it.

Please excuse the poor video quality- it looks like a bubble got trapped on our underwater camera lens! But you can make it out. The mussel is buried in the sediment, positioned so that its opening is facing up. The mussel is extending a part of its mantle into the current to use it in its reproduction process.

Mussels reproduce by releasing their glochidia (microscopic larvae) in the presence of fish.  The glochidia latch onto the fish’s gills and fins where they dwell for days or weeks, depending on the species and water conditions.  During this time the glochidia develop into microscopic juveniles and eventually drop off the fish.  If they land in a suitable place, they can create a new mussel bed.

mussel reproduction

Therefore, since fish are integral to a mussel’s life cycle, the mussels have developed ways to get a fish’s attention. By extending the colorful mantel into the current, the mussel acts like an angler’s fish lure! When a fish gets closer- the mussel shoots out the glochidia!

Special acknowledgments go to Ryan and Marty of ECT, for experiencing this really cool find with me.

Want to seal your driveway? Don’t use coal-tar based sealant!

Capture

Beautiful but deadly? Credit: USGS

Many people like to use driveway sealants to prolong the life of their asphalt driveways and to give them an attractive, shiny glow.  However, in recent years there have been a number of scientific studies that indicate using coal tar sealants have significant environmental and health effects.  Coal tar sealants contain very high levels of polycyclic aromatic hydrocarbons (PAHs), many of which are suspected or known carcinogens.

  • Coal tar pitch from sealcoat reaches streams and lakes via runoff as the sealcoat erodes. Coal tar sealcoat was determined in a study to be the largest source of PAH contamination to urban lakes.
  • PAHs are toxic to mammals, birds, fish, amphibians, invertebrates and plants. Invertebrates that live in the bottom sediment where PAHs accumulate are particularly susceptible to PAH contamination. Possible effects include reduced reproduction, forcing creatures from their habitat, and death.
  • The routine wear and tear of coal tar sealcoated pavements produces dust and particles contaminated with PAHs that can be breathed and accidentally ingested by people living by the pavements.  For someone who spends their entire lifetime living adjacent to coal tar sealcoated pavement, the average excess lifetime cancer risk is estimated to be 38 times higher than the urban background exposure. More than one-half of the risk occurs during the first 18 years of life.
  • Much of the scientific argument against coal tar comes from the USGS, and you can learn more here: Studies and information from the United States Geological Survey.

There is a safer alternative if sealants are needed.  Asphalt based sealcoats are safer, readily available, and very affordable according to the Minnesota Pollution Control Agency website.  (The state of Minnesota has banned coal tar sealcoats and provides information on alternatives.)  The most common and least expensive alternative to coal tar sealcoat now on the market is petroleum asphalt based sealcoat.  Asphalt sealcoats contain PAHs, but at far lower levels than coal tar sealcoats—about 1/1000th the PAH level of coal tar sealcoats.

HRWC is currently investigating how wide-spread the use of coal tar sealants is in our communities.  We are not sure if this is a minor problem here, or a serious issue. We will release more information as more is learned over the coming month. However, one thing seems undeniable- you do not want this material used at your house, at your neighbors’ houses, or on parking lots that you and your children walk on.

This June 20, 2013 USA Today article gives some pertinent advice. “Before sealing your driveway, hire only a contractor who provides a MSDS (material data safety sheet) for the intended product. Check to see if it contains this CAS number for coal tar: 65996-93-2. If doing the work yourself, buy only products with a “coal tar free” logo.”

Being a Creekwalker (Part 3)

The adventure comes to a close!

You can read Mark Schaller’s first post and second post about his experiences with HRWC’s Creekwalking Program.

Are you interested in being a creekwalker? You can recruit your family and friends to join you on your team or ask HRWC to assign you to a team. The training is on June 10, 6:30- 8 pm. Check out this webpage and email Jason at jfrenzel@hrwc.org to volunteer.

____________________________________________________

Guest Author: Mark Schaller

It all comes down to this, the final visit.  This time, I arrived early so I could set some crayfish and minnow traps.  I had seen fish on earlier visits but could never get a good look at any of them.  The deepest part of the stream was where I placed the thermometer so I figured that would be a good site for a trap.  I also placed a crayfish trap further upstream in a rocky area hoping to catch some more crayfish and get a good positive ID.  Everything was set!

Creekwalkers look pick up trash, take water measurements, and record and photograph erosion and infrastructure problems.

Creekwalkers pick up trash, take water measurements, and record and photograph erosion and infrastructure problems.

As I walked back to my Jeep, Erin was heading down the trail.  After our “Hello’s” we headed back to the parking lot to get the rest of the gear.  We picked up the paperwork, meter, measuring stick and my camera and headed back to the stream.  Our starting point was where I placed my crayfish trap and we had 6 crayfish already in the trap.  As I started to pull them out for pictures I found that 3 of them were the invasive Rusty.  The other 3 were northern crayfish.  They were a lot bigger than the Rusty’s so I’m hoping they are holding their own against them.  Too bad; after our last trip I thought that there weren’t any Rusty’s in here.

In midsummer, Woods Creek is a great place to sit down and soak in the cool water... if the mosquitos aren't too bad.

In midsummer, Woods Creek is a great place to sit down and soak in the cool water… if the mosquitoes aren’t too bad.

We then started by taking the water temperature and conductivity readings. When we reached the halfway point I handed the GPS and water conductivity meter over to Erin.  She wanted to see how the meter worked and I needed to get some pictures of her as well.  She took about 4 more readings and then next thing we knew we were at the end of our sample area.  All that was left now was for Erin to compile all the data and for me to turn it in with all the equipment. Mission Accomplished!

I have to say the creekwalking experience was a lot of fun.  Walking up and down Wood Creek brought back a lot of fond memories of myself as a kid exploring all the creeks and streams of my youth.

Good times.

________________________________

Our big thanks go to Mark and Erin, and all our other creekwalking volunteers, from this past summer!

Rounding Up the River

River and creek sampling

Thanks to 108 volunteers who contributed a total of 643 volunteer hours, the 2014 River Roundup was a great success!  The weather was perfect for our volunteers as they split into 21 teams and traveled to 42 different creek and river locations across the Huron River Watershed to assess the aquatic benthic macroinvertebrate community.  This study is one of the most effective ways that HRWC has to keep its finger on the pulse of the stream. From the data collected at this semi-annual event, we get a better understanding of which creeks and rivers are getting better, which are getting worse, and how we can direct our management activities.

You can see all the results in April 2014 River Roundup Report.

  • Emily checks out a crayfish! credit: Max Bromley Emily checks out a crayfish! credit: Max Bromley
  • Bruce collects insects in South Ore Creek. credit: Dick Chase Bruce collects insects in South Ore Creek. credit: Dick Chase
  • Picnic tables! Volunteers love these. (Mill Creek at Warrior Park in Dexter) credit: Eric Bassey Picnic tables! Volunteers love these. (Mill Creek at Warrior Park in Dexter) credit: Eric Bassey
  • Sampling the Huron River by Riverside Park in Ypsilanti. credit: Kristen Baumia Sampling the Huron River by Riverside Park in Ypsilanti. credit: Kristen Baumia
  • Hay Creek winds through wetlands and forests. credit: David Amamoto Hay Creek winds through wetlands and forests. credit: David Amamoto
  • Sorting the bugs on ID Day! credit: David Amamoto Sorting the bugs on ID Day! credit: David Amamoto
  • "What the heck is it?"--Paul Steen.  credit: David Amamoto "What the heck is it?"--Paul Steen. credit: David Amamoto
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Current Watershed Healthconditions April 2014

In a nutshell, the health of the watershed as judged by our macroinvertebrate sampling is holding steady. Of the 62 sites that we monitor to judge this, 28 sites have had no statistically significant changes over time, and 6 sites are too new to make this judgment.

Fourteen sites are declining, and these include locations on Chilson Creek, Davis Creek, east branch of Fleming Creek, Norton Creek, and South Ore Creek.  The majority of the declining sites are in Livingston County.  Eight of the declining sites are in Livingston, two are in Washtenaw, and three are in Oakland.

Fourteen sites are significantly improving.  Twelve of the improving sites are in Washtenaw County, including Boyden Creek, Horseshoe Creek, the main and west branches of Fleming Creek, Huron Creek, the Huron River in Ann Arbor and Ypsilanti, Malletts Creek, and several places on Mill Creek. One site is improving in Livingston County (Mann Creek at Van Amberg Road), and 1 site is improving in Wayne County (Woods Creek at the Lower Huron Metropark).

Highlights

The finger-net caddisfly (Philopotamidae) had never been seen in Malletts Creek before the spring of 2014. credit: Jude Walton

The finger-net caddisfly (Philopotamidae) had never been seen in Malletts Creek before the spring of 2014. credit: Jude Walton

1. Malletts Creek is an urban creek in Ann Arbor that has been the focus of restoration efforts for well over a decade. Last fall, we noticed a more diverse insect community in Malletts Creek than had ever been seen before.  We are happy to report that this spring we once again saw a healthier insect community than ever before.  From 1993-2013, volunteers have found an average of 5 insect families in spring samples, but in 2014 volunteers found 9 insect families. One of these insect families is a finger-net caddisfly, which is common in healthy streams but has never been found in Malletts Creek until now. The increase in insect families over time is statistically significant.

Our congratulations go out to all of the partners involved in fixing Malletts Creek! An increase in the diversity of aquatic insects reflects an increase in the overall water quality, water stability, and habitat quality. This is a major accomplishment!

2. The volunteers who sampled in Boyden Creek along Delhi Road pulled in a bonanza of caddisflies! They found 5 different types of caddisflies: the common net-spinner (Hydropsychidae), the square barked case- maker (Lepidostomatidae), the northern caddisfly (Limnephilidae), the finger-net caddisfly (Philopotamidae), and the rock case-maker (Uenoidae).  They also found two families of stoneflies and two families of mayflies.  We have been seeing good changes in Boyden Creek for several years now, and this sample was one of the best taken this spring.

Lowlights

The volunteers who sampled at Greenock Creek near South Lyon were not impressed with the size and abundance of the leeches they pulled out of their trays, nor were they impressed with the total abundance and diversity of the overall insect community.  Greenock Creek was never a very healthy creek, but conditions have significantly worsened here since monitoring began in 1993.  The creek is located downstream of Nichwagh Lake, which is impounded by a dam.  Water exiting the lake and entering the creek is quite warm, regularly reaching 85 degrees Fahrenheit in the summer, which is too warm for many types of aquatic life. It is quite possible that dissolved oxygen levels are very low in the creek also (even in the non-summer months when the water is not as warm).  This is something that HRWC will look into.

Looking upstream in Greenock Creek, October 2012.  It looks picturesque, but looks can be deceiving when it comes to water quality! credit: Max Bromley

Looking upstream in Greenock Creek, October 2012. It looks picturesque, but looks can be deceiving when it comes to water quality! credit: Max Bromley

 What’s next?

Consider being a creekwalker this summer!  You can learn more about this experience through our recent blog series. Check it out here: Part 1 and Part 2.  You can register to be a creekwalker here.


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