Lake Halcyon   Be the first to submit input for Lake Halcyon. If you have info on Lake Halcyon, Montgomery County, Maryland please submit it here to improve this web site.          These outdoors activities are available near Lake Halcyon.   Lakes Near Lake Halcyon: Lake Needwood, Montgomery County, 6 miles away Tridelphia Reservoir, Montgomery County, 15 miles away Triadelphia Reservoir, Howard County, 15 miles away Lake Barcroft, Fairfax County, 16 miles away   Public Lands Near Lake Halcyon: Seneca Creek State Park, Maryland, 6 miles away Patuxent River State Park, Maryland, 14 miles away George Washington's Grist Mill Historic State Park, Virginia, 23 miles away Glen Echo Park, McLean - VA, 10 miles away Great Falls Park, McLean - VA, 11 miles away Wolf Trap Farm Park, Vienna - VA, 11 miles away   Marinas On or Near Lake Halcyon: Nova Ocean Marine, Falls Church, 14 miles away Nova Ocean Marine, Annandale, 14 miles away Columbia Island Marina, Arlington, 15 miles away Columbia Island Marina, Washington, 17 miles away Seafarers Boat Club, Washington, 18 miles away   Camp Grounds Near Lake Halcyon: Valley Mill Camp, Germantown, 7 miles away   Hotels Near Lake Halcyon: Oakwood Gaithersburg, Gaithersburg, 1 miles away TownePlace Suites Gaithersburg, Gaithersburg, 1 miles away Courtyard Gaithersburg Washingtonian Center, Gaithersburg, 1 miles away Hilton Washington Dc North/Gaithersburg, Gaithersburg, 2 miles away Gaithersburg Marriott Washingtonian Center, Gaithersburg, 2 miles away   Ski Areas Near Lake Halcyon: Ski Liberty, Pennsylvania, 36 miles away       620 foot drop, 8 lifts, 16 runs Ski Roundtop, Pennsylvania, 57 miles away       600 foot drop, 11 lifts, 15 runs Tussey Mountain, Pennsylvania, 96 miles away       500 foot drop, 5 lifts, 8 runs   Whitewater Near Lake Halcyon: Little Seneca Creek, MontgomeryCounty, 3 miles away       Class II(III) - 5.2 miles long (Boyds to Darnestown) Rock Creek, MongomeryCounty, 5 miles away       Class I(II) - -blank- miles long (Rockville to Military Road) Potomac River, MontgomeryCounty, 7 miles away       Class V+ - 0.6 miles long (Through Great Falls)   Golf Courses Near Lake Halcyon: Woodmont Country Club, Rockville, 7 miles away Laytonsville Golf Course, Gaithersburg, 7 miles away