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.

Sweep the Creek Litter Clean-Ups this weekend
Sat, April 20 and Sun, April 21

Whether you’ve got a few minutes or a few hours…please join your neighbors to Sweep the Creek of litter and debris!

FOSC volunteers will be at 10 different sites at various times throughout the Earth Day weekend to hand out gloves and bags, and loan some trash grabbers too.

This cleanup has a major impact on the health of the creeks and parkland by removing plastic, which leaches pollutants into the soil and water, cans, bottles, auto parts and furniture and other items.

Wonder how and why Earth Day got started? Check out the Sweep the Creek page, where you can also see just how effective the Sweep is – FOSC is #1 in Montgomery County for removing litter!

The schedule is below: (click on it to see a larger version, or go to the Sweep the Creek page to see the schedule, a map, and other info as well.)

The schedule for the litter cleanups on April 20 and 21st. The cleanup in section 10M at the Long Branch Community Center has been postponed.

Note: Section 10 cleanup at the Long Branch Community Center has been postponed. Please join a cleanup at another section!

A Map of the Sligo Watershed showing the section boundaries.


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. Membership gives you early notice of events and the FOSC newsletter.

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!

Takoma Park Earth Day Celebration
Sat. April 20, 10am – 2pm in the park

The Takoma Park Earth Day celebration coincides with the first day of the Sweep the Creek event. FOSC will be there with hands-on activities for kids and adults.

You’ll have a chance to try water quality testing, sweep litter from the park, touch and ID invasive vines and weeds which strangle our trees, a macroinvertebrate search in the creek, and heat mapping.

Join us – it’s going to be a blast for all ages!

Takoma Park Earth Day Celebration April 20 in Sligo Creek at Kennebec St., from 10am - 2pm.
En Espanol, una noticia por Celebracion sel Dia de las Tierra, Sabado, 20 Abril, 10am - 2pm en el Sligo parque a la Kennebec St.

Summer Water Quality Testing – Looking for Volunteers!

FOSC and Anacostia Riverkeeper will be conducting Water Quality testing at 6 sites in Sligo/Long Branch this summer, every other Wed from May to September. You only need to attend one training to be qualified to participate in this program!

Two training sessions are available:

Wed 4/24 – Virtual training 9am-10am. Register here and join the training via this Google Meet link: https://meet.google.com/yuu-vosc-tzp

Sat 4/27 – In person training 11am -12pm at Long Branch Library, 8800 Garland Ave, Silver Spring, MD (follow the signs for the detour during construction). Register here.

Flyer for summer water quality testing training on Wed, April 24 virtually, and Sat April 27 in person at Long Branch Library at 11am -12pm.

News & Updates

President’s Day Sweeps pulled a huge amount of litter from Sligo

Mini-sweeps at 3 trash hot spots yielded an impressive amount of trash from the creeks over the President's Day weekend. Altogether, 101 volunteers hauled 118 bags of trash, [...]

Faring well? Sligo and Long Branch in a warming climate

Faring well? Sligo and Long Branch in a warming climate How healthy are Sligo, Long Branch and NW Branch? The Water Quality Committee of FOSC invites 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 find and fine the pollutors.

Spring 2024 Top Invasives

 Invasive: Italian Arum

Italian Arum is back in force around Sligo Creek and Long Branch. One of the EDRR (Early Detection, Rapid Response) invasive species, it has many little “daughter” corms attached to its main corm which makes it difficult to remove completely. Dig it out carefully. Screen the loosened soil for small “daughter” corms. There is some evidence that spraying with glyphosate is effective at killing all its corms.

FOSC Videos

See many more on the FOSC Youtube Channel

 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

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
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