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Lower Gunpowder Falls

This is a map showing the location of the Lower Gunpowder watershed.

The Lower Gunpowder Falls Watershed is located in the central eastern portion of the County. The Lower Gunpowder begins at the Loch Raven Reservoir Dam and flows generally eastward where it meets the tidal portions of Gunpowder River. Major tributaries in the watershed include Minebank Run, Long Green Creek, Sweathouse Run, Haystack Branch, Jennifer Branch and Bean Run.

The mainstream of the Lower Gunpowder Falls forms a unique geographic divide in this watershed with very rural countryside to the north and a very urbanized area on the southern side. The land to the north is primarily agricultural in nature and includes the communities of Long Green, Hydes, Glen Arm, Fork, Kingsville and Upper Falls. Land south of the river consists of developed areas such as parts of Towson, Carney, and Parkville, the commercial corridor along Joppa Road, and newer, rapidly developing areas such as Perry Hall. The valley forming the Lower Gunpowder Falls main stem consists of heavily forested lands that are part of the Gunpowder Falls State Park. The park, Maryland’s largest, is a popular destination for fishing, birding, picnicking, hiking, mountain biking and horseback riding.

The Lower Gunpowder Falls watershed is also home to Cromwell Valley Park, which is owned and operated by the Department of Recreation and Parks. Located in the Minebank Run stream valley, this 367-acre park includes pasture, open fields, forests, hedgerows, cultivated fields and floodplain; these mixed habitats make it an excellent area for diverse wildlife. The Department of Recreation and Parks hosts events and educational programs year-round for children and adults with a focus on farming, history and natural history. A portion of the park is a demonstration farm, illustrating animal husbandry and sustainable and organic farming. The farm also operates a Community Supported Agriculture (CSA) farm program. The County recently completed a major stream restoration project on the Minebank Run through Cromwell Valley encompassing three stream miles.

Previous Watershed Studies

The Lower Gunpowder Falls Water Quality Management Study was completed in September 1999. The plan identifies non-point source stormwater pollution, management measures and a restoration framework for Baltimore County's Department of Environmental Protection and Sustainability's watershed restoration program. View the executive summary (PDF).

The Lower Gunpowder Falls Watershed Assessment was completed in June 2011, to provide the county with assessments of potential sites for stream restoration projects.

Stream restorations, such as the previously referenced project on Minebank Run in Cromwell Valley Park, use state-of-the-art techniques to reduce sediment, nutrients and pollution to the County's streams and waterways.

Small Watershed Action Plan

Lower Gunpowder Falls (Urban) Small Watershed Action Plan

A Small Watershed Action Plan (SWAP) has been completed for the Lower Gunpowder Falls watershed. A public community meeting was held June 16, 2015, at Perry Hall Middle School which drew many attendees from the local community. A few short presentations were made by county employees and consulting experts, followed by lively discussion amongst participants to share what the community’s priorities are for restoration goals. Presentations provided general information about SWAPs, an overview of the SWAP area from a geographic perspective, and a brief overview of the project status to date. A second public community meeting was held October 14, 2015, at the Loch Raven Branch of the Baltimore County Public Library. This meeting included more presentations on project development and content.

  • SWAP Volume 1 (PDF) outlines the actions identified as part of the strategy.
  • SWAP Volume 2 (PDF) contains the results of the field and geographic information systems data assessments.

Lower Gunpowder Falls (Rural) Small Watershed Action Plan

The draft SWAP is now available for public comment for the rural areas of the Lower Gunpowder Falls watershed. This planning area consists of the North bank of the Lower Gunpowder Falls which flows eastward from the Loch Raven Reservoir to the Gunpowder River near Days Cove. Baltimore County hosted a public meeting on March 7, 2017.


To participate in watershed activities, contact your local watershed association, the Gunpowder Valley Conservancy.

Contact Information

Watershed Management Program
Phone: 410-887-5683
Fax: 410-887-4804

Revised August 8, 2017         


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