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 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.

Weed Warrior event – Mid Sligo north of Forest Glen Rd.

Saturday, Oct 31 from 9:00am -11:00am

Join Weed Warrior Supervisors Greg and Kathryn for a non-native, invasive plant removal workday in Sligo Creek between Forest Glen Rd and University Blvd in Silver Spring. You do not need to be certified to participate, but you do need to register! Registrants will get the details and meet up location.

Weed Warrior event – lower Sligo in Takoma Park

Wednesday, Nov. 4 from 9:00am – 10:30am
Meet at the Maple Ave bridge over Sligo Creek trail in Takoma Park.

We will continue to tackle English Ivy, Wintercreeper, Porcelainberry, and Bush Honeysuckle. If you are not a Certified Weed Warrior yet, please RSVP to me at: Elmsky(at)proton(dot)me as I’ll need to limit uncertified volunteers to 10 people. See details on the Calendar page.

News & Updates

FOSC Weed Warriors Remove Invasive Plants at Colt Terrace Park at the Sligo Headwaters

In anticipation of MoCo Parks’ extensive trail restoration projectWeed Warriors surveying wavy leaf basket grass, an invasive grass that spreads rapidly. at the Sligo headwaters in Wheaton, FOSC Weed Warriors have been out tackling invasive plants in an environmentally sensitive wetland area near the existing trail. (See photo of Weed Warriors surveying wavy leaf basket grass encroaching into the wetland, at right.) The replacement trail will be rerouted away from the wetland and mature upland forest in order to restore this habitat, while bringing the trail up to current standards.

Clean up at Indian Spring Terrace Local Park

More than 30 volunteers cleaned up the entire length of this long narrow park on Sunday, March 8. They wrestled a sofa, mattress, various chairs, fencing, many bags of plastic and glass bottles, cans, fencing, and a plastic castle playset – good for many years if not decades or more of decomposing plastic. After removing well over 1,200 pounds of trash from the park, it is looking a lot better. We also had some Weed Warriors who started freeing trees from English ivy!

Some the volunteers who cleaned up more than 1,000 pounds of trash at Indian Spring local park and restoration site on March 8, 2026.

March 8 cleanup at Indian Spring Restoration site at Flower and Granville by Ed Murtagh

Thanks to everyone who came out and helped us get this park and restoration site, the headwaters of Long Branch, poised for spring growth without the trash and pollutants that would have been carried downstream into the rest of Long Branch. The restoration area, which has 5 stone stormwater retention ponds and hundreds of native plants installed by the Parks Dept, is worth a visit to see the investment the County is making in our watershed.

Join FOSC

FOSC logo

Sligo Creek connects us

Become a FOSC member and help protect and restore the Creek for everyone in our community. It’s simple to do and can be free if you wish. Membership gives you early notice of events and the monthly FOSC newsletter.

You can make a donation, either online here or using the button below (both are simple and secure), or by check to FOSC, P.O. Box 11572, Takoma Park, MD 20913. Thank you!

FOSC Action Hub

Sligo Creek Water WatchDog mascot

See Water Pollution in Sligo? Report it 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 find and fine the pollutors, to [email protected].

In the spring of 2025, a major water main break poured thousands of gallons of chlorinated water, mud and debris into Sligo Creek. As the following video shows, water main breaks are a major threat to Sligo’s water quality and the flora and fauna who depend on it.

Fall 2026 Top Invasives

Check out the Invasives page to see the other side of this postcard, and learn more about invasive plants that are going into the park from yards around the watershed. Do some look familiar? If you have them in your yard, please dig them out and replace them with native plants that provide food and shelter, and host the larvae of beneficial pollinators.

FOSC Videos

See many more on the FOSC Youtube Channel

 FOSC on iNaturalist

Pine Siskins at Wheaton Branch Ponds by Stephen DaviesPine siskins at Wheaton Branch ponds
(Photo 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

FOSC on Facebook

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
  • Tell us about your experience at a FOSC event
  • Suggest an activity
  • Voice your concern about an environmental issue