StreamWatch began in 1995 as a comprehensive monitoring program designed to assess the health of the waterways in and around Lower Merion. Individuals known as StreamKeepers visit specific sites along local streams each month to make observations and track changes. Conservancy staff use a YSI pro plus probe and collect quarterly water samples to further assess stream health.

In addition to water testing,  we collect aquatic insect larvae each spring to analyze the biodiversity of Mill Creek. A summary of our findings is published in our Mill Creek Report.

2013 Mill Creek Report

If you would like to learn more about StreamWatch, email

LMC Monitoring Sites

StreamBank Stabilization Projects

In addition to our monitoring program, we maintain a stream restoration program for township parks like Ashbridge Memorial Park in Rosemont and West Mill Creek Park in Gladwyne. Healthier streambanks mean healthier streams. The vegetated areas along streams, formally called riparian buffers, serve a variety of functions. The plants and trees along riparian buffers not only provide shade to allow for healthier water temperatures, but they also help to stabilize streambanks to prevent erosion. Riparian buffers reduce the amount of stormwater runoff entering the stream and serve as crucial habitat for birds and other streamside wildlife. By restoring and stabilizing streambanks, we can improve the water quality of our streams and create habitat for wildlife.

Learn more about our monitoring and restoration work below:

Stream Monitoring

Mill Creek Project – HDR Foundation

Mill Creek Project Supported by a grant from the HDR Foundation What we’re doing? The Lower Merion Conservancy (LMC) is partnering with the Villanova Department of Geography and the Environment (GEV) to expand upon its historically recognized StreamWatch
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Streambank and Stormwater Photo Monitoring

We are asking for volunteers to take photographs of streams on a regular basis (monthly or quarterly) to expand the Conservancy’s stream monitoring program. The photos can be in a park, along a trail, or in your backyard. Stream size does not matter and
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Stream Restoration and Stormwater Management Projects

Ashbridge Memorial Park

Airdale Road, Bryn Mawr, PA     In 2002, the Conservancy partnered with the Bryn Mawr College’s School of Social Work and Lower Merion Township to create Lower Merion’s first streambank stabilization project using some funds from DEP’s Growing Greener program.  Steep, crumbling streambanks,
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West Mill Creek Park

Old Gulph Rd, Penn Valley, PA On the heels of a 2005 wetland planting in the park, the Conservancy partnered with Lower Merion Township in 2007 to secure DEP Growing Greener Funds to stabilize the stream banks in the park.  Volunteers from Main Line Health participating in the United Way Day
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Shortridge Memorial Park

Shortridge Drive, Wynnewood, PA The East Branch of Indian Creek, a headwater branch for Cobbs Creek, flows through this park. Impacted by stormwater and mowed-to-the-edge landscape practices the stream banks were eroding and impacting water quality. In 2009, the Conservancy worked closely wi
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Stormwater Demonstration Garden and Children’s Playscape

Funded by the 25th Century Foundation and completed in 2012, the Stormwater Demonstration Garden and Children’s Playscape (Rolling Hill Park, Gladwyne PA) is a native residential-scale rain garden that captures and treats the Conservancy’s stormwater runoff from our driveway and a portion of
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