Harmful Algal Bloom Advisories

UPDATE: Triadelphia and T. Howard Duckett Reservoirs

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This project is needed to remove sediment surrounding the intake structure at Brighton Dam, as well as removing sediment that has accumulated upstream of the dam since its original construction in the 1940’s. 

Once complete the reservoir’s drinking water storage capacity will increase by about 1 million gallons of water.

Due to lower reservoir levels, all boat ramps on Triadelphia Reservoir will be closed, and no boating will be allowed. Additionally, the Greenbridge and Pig Tail recreation areas will be closed to ensure public safety due to the construction activity. As a result, shoreline fishing will only be available at Big Branch and Triadelphia Recreation areas. Recreational activities on T. Howard Duckett Reservoir will not be impacted.

The project’s anticipated start date is anticipated to start late Summer 2022 and is dependent on securing permits from the state. Once the water level in the drinking-water reservoir is lowered and construction equipment is in place, the project will take 4 to 5 months to complete, weather permitting. Most work will occur during weekday daylight hours (7:00 am – 5:00pm). If needed, weekend work may occur.

Residents can expect 15 to 25 daily dump truck round trips between Greenbridge and Pig Tail recreation areas during work hours. Trucks will follow all posted speed limit signs and drive along the following roadways: Greenbridge Rd, New Hampshire Ave., Brighton Dam Rd., Highland Rd., Triadelphia Mill Rd., and Greenbridge Rd. (see map) Trucks will be lined to reduce sediment leaking during transport. Minimal noise is expected from the trucks traveling along the route and around the recreation areas. There will also be construction equipment at the Pig Tail recreation area to spread the sediment.

Triadelphia project sediment removal area

Additional Information

Send questions to the project manager, John Kasprzak, at 301-206-8554  or or complete this form below.

Last Modified: July 7, 2022, 9:07 am EDT