Lakes in Washington County, Maryland      Big Pool Blairs Valley Lake Boonsboro Reservoir Edgemont Reservoir Edgemont Reservoir Greenbriar Lake Hagerstown Reservoir Hancock Sewage Lagoon Lake Edward Elliote Jenkins Lake Jenkins Lake Lanahan Lake Nesbit and Lanhan Lake Royer Little Pool Potomac River Reservoir Potomac River Reservoir Lake Royer Smithsburg Reservoir OTHER COUNTIES NEARBY District Of Columbia County Allegany County Carroll County Frederick County Howard County Montgomery County Prince Georges County Adams County Bedford County Blair County Cambria County Cumberland County Dauphin County Franklin County Fulton County Huntingdon County Juniata County Lebanon County Perry County Alexandria City County Arlington County Clarke County Culpeper County Fairfax County Fairfax City County Falls Church City County Frederick County Loudoun County Manassas City County Manassas Park City County Prince William County Rappahannock County Shenandoah County Warren County Winchester City County Berkeley County Hampshire County Hardy County Jefferson County Mineral County Morgan County Maryland Lakes