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 other 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.

Thank you to everyone who came out to clear the creek and park of litter at the Sweep the Creek event.

See photos of sweepers and their finds, from the Sligo headwaters to the confluence with NW Branch, on the Sweep the Creek photos page. Send your pics to [email protected].

The weirdest find of this Sweep: scuba diving headgear and tank, found by the Section 1 Sweep team!

The weirdest discovery in the creek during the recent Sweep the Creek litter pick-up was this scuba diving headgear and tank, found in Section 1


FOSC logo

Sligo Creek connects us. Please Join FOSC and help protect and restore the Creek for everyone in our community. It’s simple to do and can be free if you wish.

You can make a donation
too, either online (simple and secure) or by check to FOSC, P.O. Box 11572, Takoma Park, MD 20913.
Thank you!

News & Updates

Salt Watch Is Gearing Up for the Winter – Join Us

WQ Committee to Continue Two SaltWatch Initiatives This Winter
Volunteers needed!

The FOSC water quality team is gearing up for the winter season. We’re monitoring Sligo Creek salt levels because excessive salt, from roadways, parking […]

Fall Sweep Results

Thank you, Sweep Participants! The Fall Sweep results are in!  Volunteers removed 200+bags of trash and recyclables from the creek and adjacent parkland! Thank you [...]

FOSC Action Hub

Sligo Creek Water WatchDog mascot

Report water pollution ASAP!
Send an email to:

[email protected]

You play an important role protecting Sligo. Please report any pollution you see in the creek or heading into a storm drain ASAP, with photos which help County investigators.

The Salt Watch (Road Salt) Initiative volunteer program is starting up for the winter season. It’s not too late to volunteer. Let the Water Quality Committee know if you’re interested: [email protected]

Last winter’s results and our interpretation of them are on the Water Quality Salt Monitoring page.

The proposed Royal Farms gas station site at Sligo Creek and Riggs Road. FOSC contributed to a formal appeal, by members of the Carole Highlands Neighborhood Assn, of the Prince George’s County Zoning Hearing Examiner’s recent approval of a 16-pump gas station adjacent to Sligo Creek Park at Riggs Rd. The appeal was drafted with pro-bono legal help from the Chesapeake Bay Foundation and participation by faculty and students in the Environment Law Clinic at the University of Maryland Carey School of Law. Read the appeal on the Letters and Testimony page.

Autumn forest of tall trees with leaves turning yellow, orange, and brown.FOSC Advocacy has been an active partner with the MoCo Forest Conservation Coalition to advocate for strong protection of MoCo’s remaining forests. In an April 28 Planning Commission hearing, the Coalition and many groups and individuals testified or submited written testimony arguing for stronger protections than the Commission’s proposed amendments to the existing Forest Conservation law would provide.

For more information about the issue and the bill, and to get sufficient information to write your own testimony, go to the Audubon Naturalist Society blog. You can use FOSC’s own written testimony as a guide for yours.

MoCo Councilmembers hold signs saying 'Electrify everything now' at the annoucement of the bill. The Council will consider the bill on Tues, July 26.Consider signing the petition asking MoCo Council members to support Bill 13-22, the Comprehensive Building Decarbonization Bill. The hearing for this bill is coming up in a few days, on Tuesday, July 26, 2022.

Graphic of proposed downtown Silver Spring redesign of Ellsworth DriveStill pending! Find 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.

Recent Videos

See many more on the FOSC Youtube Channel

Remove Invasives from Your Yard & Keep Them Out of Sligo

Fall 2022 Top Invasives

 FOSC on iNaturalist

Pine Siskins at Wheaton Branch Ponds by Stephen Davies

Heard about FOSC on iNaturalist.org but uncertain how to navigate the site or contribute your own observations? Expert birder and iNaturalist… Read more

FOSC on YouTube

Support FOSC

Donate to Friends of Sligo Creek

Get Involved

  • Participate in your community
  • Meet your neighbors
  • Improve your surroundings
  • Enhance your skill set
  • Advocate for the Creek
  • Arrange a group activity for your club or group
  • 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
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