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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.

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!

The next training session is:

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.

Bird Walk on Sat, May 4 at 8:00am

Head out in the early morning to catch sight/hear migrating as well as local birds, guided by 3 accomplished birders. Please RSVP to [email protected] by May 1st.

This event will have a limited number of participants, with event details and location sent to those who have registered. We will keep a waiting list. For details, see the FOSC Calendar of Events page.

Birders with their binoculars trained on the trees of Sligo Creek at Forest Grove.

Sligo Creek Fest on Sat, May 4
11:00am to 3:00pm
on Sligo Creek Parkway between Dennis Ave and University Blvd.

A poster for the Sligo Creek Fest taking place on Sligo Creek Parkway between Dennis Ave. and University Blvd. on Sat. May 4, from 11am - 3pm.

Sligo Creek Fest is a free street festival in the park for residents of all ages, with live music, street performers, kids’ activities, hands-on activities by community groups and Montgomery Parks, and food/beverages from food trucks and local breweries. FOSC will be there! Find out more on the Parks website.

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 [...]

Join FOSC

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!

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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