Seneca Creek State Park

Clopper Lake

Park Reservations

To reserve one of our rental picnic areas or pavilions​, contact the Maryland Park Service reservation desk at 1- 888-432-2267 or

For all other questions, contact the Park:

Montgomery County

Seneca Creek State Park
11950 Clopper Road
Gaithersburg, MD 20878

8 a.m. to Sunset, March-October
10 a.m. to Sunset, November-February

Service Fee Charges:
Weekends and Holidays, April-October: $3 a person for Maryland residents
$5 a person for Out-of-State residents


The park, comprised of 6,300 acres, extends along 14 scenic miles of Seneca Creek, as it winds its way to the Potomac River. The Clopper Day-Use Area contains many scenic areas, including the 90-acre Clopper Lake, surrounded by forests and fields. Picnicking, boat rentals, trails and a tire playground are just some of its recreational opportunities. A restored 19th century cabin and a self-guided path interpret the history of the area. Over 50 miles of trails are open for hiking, horseback riding and bicycling which wind through a variety of habitat.

Note: Swimming and wading are not permitted in Clopper Lake at Seneca Creek State Park. The closest Maryland State Parks with lifeguarded lake swimming are Cunningham Falls State Park and Greenbrier State Park. Wading is permitted at your own risk in Great Seneca Creek, the free flowing creek which runs the length of Seneca Creek State Park.

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Mountain Biking

Mountain Biking in Seneca Creek State Park

Schaeffer Farm Trail System
Schaeffer Farm is the hub of a trail system unique in Maryland. The trails at Seneca Creek State Park provide the backbone of a network that extends into most of the upcounty area. Configured in a series of loops, you can enjoy as few as four miles or go for an all-day adventure. It is possible to do a trail loop stretching 60 miles or more when you leave the trailhead. Linking the Seneca, Muddy Branch, and Potomac watersheds, visitors can journey from Schaeffer to Damascus to the Potomac and back.

One of these larger loops has been recognized by the International Mountain Bicycling Association as one of the best and most important routes in the country.​​

image of a corn field

Seneca Creek State Park - Agricultural Opportunities

Part of the Maryland Park Service mission is to promote the management of natural and cultural resources to ensure the continuing benefits for present and future generations, and farming is an important component of that. Agriculture is one of the central themes in Maryland’s rich and complex history and remains an important part of our state’s culture. It helps maintain wide open spaces and provide pastoral views that have remained unchanged despite surrounding development. Agricultural land use can also provide important food for wildlife and provide locally sourced food for nearby communities. In areas of Seneca Creek State Park where agriculture can coexist with passive recreation, the Maryland Park Service leases out lands that contain prime agricultural soils and have a history of being farmed to interested farmers for short-term agricultural use.

Are you interested in farming at Seneca Creek State Park? See the list below for agricultural lands out for bid:

If you’d like to submit a bid for leasing one of the above agricultural properties, please fill out the hyperlinked form for the property of your choosing and return either via mail or in person by 12:00pm November 5, 2021, to:

Seneca Creek State Park
11950 Clopper Road
Gaithersburg, MD 20878