Friends of Sligo Creek is a nonprofit community organization dedicated to protecting, improving, and appreciating the ecological health of Sligo Creek park and its surrounding watershed.

What FOSC does

Friends of Sligo Creek (FOSC) offers events year round in support and appreciation of Sligo Creek and adjacent parkland. Litter clean-up and invasive plant clear-out events are among the most popular FOSC activities in the spring, summer and fall. FOSC also sponsors guided outdoor explorations of different sections and aspects of Sligo Creek flora and fauna. A wide variety of indoor programs throughout the year educate neighbors and users of the park about Sligo Creek’s strengths and challenges. FOSC also monitors the creek, advocating for civic policies that will support a healthier Sligo.

FOSC invites you to visit the creek, volunteer at an upcoming event, attend a program, advocate for the Creek, and join FOSC.

    Recent Event

    Pine Siskins at Wheaton Branch Ponds by Stephen DaviesHeard about iNaturalist.org but uncertain how to navigate the site or contribute your own observations? Expert birder and iNaturalist contributor Stephen Davies recently gave a tour through the many features of this site. He used the iNaturalist project “Fauna and Flora of the Sligo Creek Watershed” as a starting point.

    iNaturalist is an open-source, joint initiative of the California Academy of Sciences and National Geographic. It has world-wide scope, with 3.5 million people contributing 60 million observations to date.

    Users can upload their observations, keep track of their photos, view other contributors’ observations, crowdsource identifications, join citizen science projects, see trends and build knowledge of the natural world. Creating an account at iNaturalist is simple and free.

    FOSC also has a page on how-to-navigate-in-iNaturalist to help you find observations of interest and upload your own, as well as a page on how eBird.org works.

    To receive the Newsletter with all upcoming event invitations and meeting links, please join FOSC.

    Join FOSC!

    Sligo Creek connects us. The varying murmurs and roars of the Creek, the raindrops glistening on the tree leaves, the surprising plant and animal life all offer opportunities for reverie and reflection, comfort and respite.

    Friends of Sligo Creek works to protect and restore Sligo Creek. We organize neighbors like you to:

    • remove non-native, invasive plants in Sligo Creek Park;
    • monitor water quality and report illegal pollution;
    • present Zoom programs on Sligo’s natural history and other topics, such as our recent event on Feb 24th meeting on iNaturalist;
    • promote stream litter clean-ups;
    • manage local stormwater projects and educate our community about stormwater management;
    • advocate for Sligo-friendly practices to local, state and other officials; and more.

    Please help support Friends of Sligo Creek for everyone in our community. Join FOSC, and make a donation today. Donating online is easy and secure. Or donate via check to: FOSC, P.O. Box 11572, Takoma Park, MD 20913.

    Many volunteer efforts are getting underway now. Find out about them and plan to be a part of protecting Sligo Creek and park.

    Thank you very much.

    -Mike Smith, President of FOSC

    News & Updates

    FOSC Action Hub

    Sligo Creek Water WatchDog mascot

    You play an important role protecting the creek. Please report any pollution you see. Photos are very helpful as is information about any storm drain possibly involved.

    A beneficial native vine sometimes mistaken for an invasive plant.

    Unless you are a MoCo certified Weed Warrior, please don’t cut or remove plants in Sligo Creek park. Recently someone mistakenly cut a native grape vine. If you have any questions, please contact [email protected]. If you’d like to become a Weed Warrior, please email [email protected]

    Graphic of downtown Silver Spring redesign of Ellsworth DriveFind out why FOSC opposes synthetic turf on Ellsworth Drive in DTSS. Write the County Executive to oppose abandonment of Ellsworth Drive unless healthy alternatives are used. Write to Marc Elrich, Montgomery County Executive.


    FOSC Supports the MD Plastic Bag Reduction ActFOSC supports the Plastic Bag Reduction Act (HB 314/SB223) now in House of Delegates, Environment & Transportation Committee. Introduced by Del. Brooke Lierman, the bill would ban single use bags in MD. Write to your delegate or Kumar Barve, Committee Chair, to express your opinion.

    Map of Wheaton Branch Flood Mitigation Project - issues

    The FOSC Stormwater Committee suggested to DEP and DOT that the Wheaton Branch Flood mitigation project incorporate more green strategies and extend the project to Bucknell Drive. Find out more on the Stormwater page and add your voice to the conversation with DEP/DOT.

    What’s in the Water? Sligo’s Water Quality
    Dec 14 online event

    The Water Quality committee presented a program of 7 speakers on different aspects of Sligo’s water at its first annual public meeting on Dec 14, 2020. View the video here and on FOSC’s Youtube channel.

    Updates on the state of Sligo Creek included continuing concern about microplastics, sediment pollution, bacteria loads, salts, and water temperature but notable increase in certain fish species. We also heard updates on wildlife in and around the Creek, the citizen-powered Water Watchdog program, recent stormwater events in the area, and advocating for the Creek. The Committee then opened things up for questions, observations, and suggestions for Friends of Sligo Creek’s water quality program.

    Please share your concerns and interests with us if you’d like.

    — Pat, Anne, Paul, Dean and Chris of the FOSC Water Quality Committee
    wq at fosc.org

    Ideas for Habitat Improvements at Wheaton Branch Stormwater Ponds

    Friends of Sligo Creek recently recommended to the County three ways to improve the natural habitat at the Wheaton Branch stormwater ponds.

    These ponds support fish and macro-invertebrates that attract many species of birds including night-herons who depend on crayfish. The surrounding land provides grasses and wildflowers for bird nesting and nectar sources for a diversity of pollinators.

    1. Reduce Mowing: Mow only once a year along the northern pond banks to allow for the growth of grasses and wildflowers throughout the spring, summer, and fall, to support wildlife. Mid-summer mowing destroys habitat for food, shelter and raising young.
    1. Restore the bird-nesting boxes: These used to be in place on tall poles within the ponds (for example, in the northeast quadrant of the pond complex). They attracted breeding pairs of Tree Swallows, which no longer nest in the area and are rarely seen there. Consider also adding boxes along the banks for Eastern Bluebirds, which are likely to nest in this area.
    1. Explore expanding the habitat around the ponds: More square footage would allow more dense habitats to grow and increase the structural complexity of those habitats to support greater numbers of species.

    Great Blue Heron with a crayfish in its mouth 

    Recent Videos

    How to Remove Invasive Plants from Your Yard & Keep Them Out of Sligo

    FOSC on YouTube

    Donate to FOSC

    Donate to Friends of Sligo Creek

    Get Involved

    • Participate in your community
    • Meet your neighbors
    • Improve your surroundings
    • Enhance your skill set
    • Arrange a group activity for your club or group
    • Advocate for the Creek
    Join FOSC
    • Receive the monthly eNewsletter
    • Get early notice of events and special opportunities
    • Have your name forwarded to your Section Steward for hands-on events
    • Contribute to special projects
    • Fund outdoor events, expert talks, equipment for invasive plant/litter removal, the kiosks in the park, water quality testing, and more
    • Support FOSC’s outreach to schools, civic groups, and all communities
    We’re listening
    • Tell us about your experience at a FOSC event
    • Suggest an activity
    • Voice your concern about an environmental issue
    Go to Top