Montgomery County, Md
Can be accessed at Brighton Dam Recreational Park to pray. Brighton Dam/Triadelphia Reservoir, Brookville MD, on Montgomery / Howard county border. Serves WSSC area around DC. Alternative Energy Associates Ltd. Partnership.
Can be accessed at Burnt Mill East Special Park.Burnt Mills Dam, Robert B. Morse Filtration Plant, Reservoir straddles Colesville Road between New Hampshire Ave. and University Blvd. in Montgomery County MD.Washington Suburban Sanitary Commission.
Little Seneca Dam, Little Seneca Lake, Located within Black Hill Regional park in Montgomery county Md. Provides emergency drinking water supply to the Washington DC metropolitan area.Washington Suburban Sanitary Commission
Howard County Maryland/P.G/Montgomery Counties
Rocky Gorge Dam, Rocky Gorge Reservoir, Washington Suburban Sanitary Commission. Rocky Gorge Reservoir is located on the Patuxent River in Howard, Montgomery, and Prince George's counties in Maryland, between Laurel and Burtonsville. The reservoir was created in 1952 by the construction of the T. Howard Duckett Dam on the Patuxent. The dam is visible from Interstate 95 near milemarker 34.
Maryland 21043, Howard County, Maryland.
Howard County Md, Carroll County Md
Liberty Dam, Liberty Reservoir, Baltimore City Department of Public Works. On the border between Carroll and Baltimore counties on the Patapsco river. Serves Baltimore and Howard counties via Lake Ashburton filtration plant.
Piney Run Dam, Piney Run Reservoir, Carroll County, Maryland Built to provide future potable water supply for southeastern Caroll County. MD
Centinnial Lake Dam, Daniels Dam, Lake Elkhorn Kittamagundi, Wilde Lake Dam, Columbia Md and Howard County, Md
Baltimore County, Md
Loch Raven Dam, Loch Raven Reservoir, Baltimore City Department of Public Works. Located in Baltimore county, MD east of Timonium, provides potable drinking water to Baltimore city and most of Baltimore county via the Montebello lake and filtration plants. The inflow source is the Gunpowder River.
Prettyboy Dam, Prettyboy Reservoir, Baltimore City Department of Public Works. Located in northwest Baltimore county and a small portion of Caroll county. Acts as a backup to Loch Raven via the Gunpowder Falls.
Harford County, Md-Eagle Dawn Massammi and group doing these two.
Conowingo Dam, Conowingo Reservoir, Spans the Susquehanna river between Harford and Cecil counties on US Rt. 1. Philadelphia Electric Co. (Provides Hydro Electric power as well)
Conowingo Hydro Station, 2569 Shures Landing Rd, Darlington, MD 21034
Allegeany County, Maryland
Rocky Gap Dam, Lake Habeeb, Maryland Department of Natural Resources. Located in Flintstone, Allegany county, MD and constructed by the Army Corps of Engineers to impound Rocky Gap Run and lake Habeeb.
Garrett County, Md
Jennings Randolph Dam, Jennings Randolph Lake, United States Army Corps of Engineers Garrett County, MD and Mineral County WV (on the North branch of the Potomac river) Provides water to the DC metropolitan area 200 miles south.
Deep Creek Hydro Electric Dam, Deep Creek Lake, Oakland, MD Pennsylvania Electric Company Provides electric power to surrounding areas of Maryland and Pennsylvania.
Savage River Dam, Savage River Reservoir, Upper Potomac River Commission. Garrett County, Md. The reservoir was formed by the Savage River Dam which impounds the Savage River and is used for flood control and municipal drinking water supply.
FILTRATION PLANTS—Baltimore City, Md
MONTEBELLO FILTRATION PLANT NO. 1 is located at 3900 Hillen Road, was placed in service in service in 1915 and can treat up to 128 million gallons per day of water from Loch Raven Reservoir or the Susquehanna River. The plant has two rapid mix chambers, four flocculators, four sedimentation basins, and 32 rapid sand filters. Treated water from the plant supplies the First Zone by gravity and other zones via pumping.
MONTEBELLO FILTRATION PLANT NO. 2 is located on the West Side of Hillen Road opposite of Plant No. 1. This facility began operation in 1928 and can treat up to 112 million gallons per day of water from either Loch Raven Reservoir or the Susquehanna River. Plant 2 has two rapid mix chambers, three flocculators, three sedimentation basins, and 28 rapid sand filters. This plant serves the First Zone by gravity and provides potable water to other zones using pumping stations.
ASHBURTON FILTRATION PLANT is located at 3001 Druid Park Drive. This plant was placed into service in 1956 and has a capacity of 165 MGD. The plant includes four flocculators, four sedimentation basins, and 20 rapid sand filters. Raw water supply for this plant is obtained from Liberty Reservoir. Drinking water flows by gravity from the Ashburton Plant to the Second Zone and is pumped to other zones in the Central System.
Notes: Baltimore City operates three water filtration plants to meet current and future demands of the metropolitan area’s 1.8 million consumers. Montebello Plants I and II are normally supplied by the Gunpowder Falls Reservoirs. Water from Loch Raven flows by gravity to the Montebello plants through a 12’ tunnel. The capacity of Plant I is 128 million gallons per day (MGD) while Plant II is rated at 112 MGD.
In times of drought, the Deer Creek Pumping Station supplements Loch Raven by pumping water from the Susquehanna 37 miles through a 9’ transmission main to Montebello. The third filtration plant, Ashburton, located on the west side of the City, is supplied by Liberty Reservoir through a 10’ wide tunnel 13 miles long. This plant can treat up to 165 MGD.
The City’s water supply system must not only meet everyday water demands but also the maximum projected needs of consumers. The combined safe treatment capacity of the three plants is over 400 MGD.
To help preserve the high quality and safety of our drinking water system, the Baltimore City Department of Public Works (DPW) has been converting our open-air drinking water lakes into buried tanks. As of December 21, 2023, work to cover the remaining open-air reservoirs at Druid Lake and Ashburton is complete. The conclusion of both projects provides an added layer to protect the region's water supply against cryptosporidium.
As a result, the precautionary advisory for immunocompromised residents is no longer in effect. For more on both projects, take a moment to read the latest press release. We’ve completed projects in Towson and the Montebello II Filtration Plant, and are in construction on projects at the Guilford and Druid Lake reservoir. Our drinking water will be much safer and more secure with these underground tanks, and it allows us to comply with federal Safe Drinking Water Act regulations.