Calendar of Events
See upcoming events, view the calendar, make a suggestion for an event, and see summaries of past events.
UPCOMING EVENTS
Water Quality Testing this summer
Friday May 20 at 10am: Volunteers needed for biweekly Water Quality Testing May – Sept. Attend the virtual training session and join in the effort to track and understand the water quality of Sligo Creek and Long Branch! Sign up at the Anacostia Riverkeeper Eventbrite page.
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What program or event would you like to see FOSC offer?
PAST EVENT: Stormwater Challenges in TP
PAST EVENT: Trash Action in the MD Assembly
Shari Wilson, Interim Executive Director of Trash Free Maryland, briefed us on the trash and litter reduction bills in the Maryland General Assembly this session, including where lobbying might have the greatest impact.
PAST EVENT: How’s the Water? Results of the Summer Water Quality Testing Program in MD
Water Quality continues to be a challenge overall in Sligo and its tributaries. But there are areas that are improving. See the weekly results of the summer testing program in Sligo on the ARK/FOSC Volunteer Water Quality Monitoring Data page. The just-released Final Maryland Summer Volunteer WQ Report is also on that page, and on the Anacostia Riverkeeper website. View the video of the event at this link.
PAST EVENT: Meet Chris Williams, new President of AWS
Chris Williams, the new president of the Anacostia Watershed Society spoke about his vision for the Watershed, including Sligo Creek. View the video – the passcode to the video is: Z?4Z64tU
PAST EVENT: “Migratory fish in Sligo?”
July 20, 2021 – Phong Trieu of the Metropolitan Washington Council of Governments Anacostia Program described his findings and observations about the migratory fish entering Anacostia watershed tributaries in recent years. View the video of the talk:
PAST EVENT: “Bird Outing”
June 19 -Bird outing with Dave Blockstein and Mary Sanger.
PAST EVENT: “Cicada Party”
PAST EVENT: Bird Outings
May 14 – Bird outing with Dave Blockstein & Mary Sanger.
May 15 – Bird outing with John Stith
PAST EVENT: USGS Monitoring in Sligo – data and trends
Chuck Walker of the regional USGS MD-DE-DG Water Science Center spoke on the health and water quality of Sligo Creek. The Water Science Center has partnered with MoCo DEP to collect continuous water quality data on 7 parameters at the Maple Ave gauge. How is Sligo faring compared to other regional streams? Chuck discussed the long term trends and implications for Sligo as our area gets more densely populated. If you missed the event, check out the video on FOSC’s YouTube channel.
PAST EVENT: Urban Forestry in MoCo Parks
View the video of the presentation
Oct 27 – Urban forestry in Parks – Colter Burkes, Senior Urban Forester at Parks, led a presentation and discussion of tree management in Moco Parks, plus green waste recycling, and hazardous tree management.
PAST EVENT: “Spotlight on Native & Invasive Vines of Sligo / Virtual Tour of Sligo Meadow & Restoration Projects”
-English Ivy
-Japanese Honeysuckle
-Mile-a-Minute
-Oriental Bittersweet
-Porcelainberry
-Wintercreeper
-Kudzu
-Wisteria
Corinne’s presentation shows photos of these NNIs. Please pull them from your yard!
Dianna Loescher, Senior Natural Resource Specialist at Parks, led a virtual tour of the Sligo meadow and restoration projects, highlighting the techniques and plantings that are working and those that have been revised as site data is gathered. Check out her presentation here.
Our thanks to Corinne and Dianna for great presentations!
PAST EVENT: “Less Lawn, More Life”
Merikay Smith, of the Master Gardeners Speakers Bureau and the Muddy Branch Alliance board, described the process of converting her lawn into a native plant habitat that supports a diverse array of wildlife. Her neighbor joined in, converting parts of their lawn too.
She recommends starting by assessing what you have already – is it native or not, is it a non-native invasive or not? Take out the non-native invasives first! Some other elements of a habitat to incorporate are:
—Plant a full stand of a native – too little and birds who are attracted to nest near it are unable to feed their young for lack of food (chicks don’t eat seed, they eat caterpillars or other insects, so plant enough so there are insects to feed the brood.)
—Put a water source – can be a simple dish you pour out and replenish every few days.
—Make changes by starting with the corners, and then the edges of your property.
—Start in a corner(s) by planting a native tree – these are the circles on a plan. Oaks are superstars. For example, a Black Jack Oak supports 500+ species of insects
—Then connect the circles with beds along the edges.
—Site prep – build beds by covering a lawn area with cardboard, then compost and mulch, in the fall. Don’t dig!
—Fully research the species / cultivars you plan to plant since many seem native but aren’t genetically native and a host for local insects.
—Get recommendations by zip code through the National Wildlife Federation’s Native Plant Finder and the Audubon Society’s Plants for Birds.
—Focus on keystone plants – those that sustain the food web of plants-insects-birds:
Keystone trees: White Oaks are superstars; Native Cherries, Native Willows, Native Birches, Cottonwoods, Elms
Keystone herbaceous plants: Native Goldenrods, Asters, and Sunflowers.
PAST EVENT: Improving Outreach and Inclusion
Our watershed is diverse in so many ways. We recognize that we need to reach out thoughtfully and more effectively to be inclusive of all Sligo watershed communities in outreach, programming and leadership.
On March 25, three leaders in the Black and Latino environmental movement discussed their perspectives on how Friends of Sligo Creek can engage the diverse communities living within the watershed.



(l to r) Ruby Stemmle, founder EcoLatinos; Raymond Coates, Community Outreach Coordinator, Ward 8 Woods and EarthJustice; and Dennis Chestnut, founder Groundworks DC, and Board, Alliance for the Chesapeake
Moderated by FOSC Advocacy director Kit Gage, the panelists discussed the importance of developing relationships with the communities who have been underrepresented in FOSC’s work; learning about the issues important to those living in the community; and tapping residents to develop and lead initiatives in those communities. A synopsis recording of the discussion is available below from the FOSC YouTube channel.
PAST EVENT: How to use iNaturalist

Heard 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 57.8 million observations to date.
Users can upload their observations, keep track of their photos, 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.
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PAST EVENT: What’s in Sligo’s Water?
Membrs of the Water Quality committee – Anne Vorce, Pat Ratkowski, Paul Chrostowski – and guests Mike Smith, FOSC President, Elaine Lamirande from the FOSC Stormwater Committee, Kit Gage from the Advocacy Committee, and Rachel Gauza from the Park Dept’s Aquatics Resource Management office presented a fascinating glimpse into the state of water quality of Sligo Creek today and trends over time.
These speakers discussed many facets of Sligo’s water quality: pollution and the importance of FOSC’s citizen-powered Water WatchDog pollution reporting and tracking program, growing concern on microplastic and persistent chemical contaminants, sediment pollution, chemical and Coliform bacteria loads now and trends, macro-invertebrates in the Creek, the detrimental impact of the increasingly powerful stormwater events on Sligo, and FOSC’s Sligo advocacy work across many issues, including against a proposal for use of synthetic turf locally.
We then opened things up for questions, observations, and suggestions on Friends of Sligo Creek’s water quality program.
— The FOSC Water Quality Committee