Gillis Falls - March 25, 2019 Gillis Falls Information and discussions related to Gillis Falls in Mount Airy, MD. Share Share on Facebook Tweet on Twitter Back to Trail Discussions Tags 495 Jumps Avalon Bacon Ridge Banneker Park Belmont Park Black Hill Regional Park Brookfield Park BROT Bull Run Occoquan Trail Cabin John Regional Park CCT Cedarville State Forest Chesapeake Church Trails Clopper Lake Colts Neck Park Conway Robinson State Forest Cosca Regional Park Cross County Trail Daniels Diabase Trail Emmitsburg Fariland Regional Park Fort Circle Fort Dupont Fountainhead Regional Park Fred Crabtree Frederick Watershed Freedom Center Gambrill State Park George Washington National Forest Germantown Bike Park Gillis Falls Greenbrier State Park Gunpowder Falls State Park GWNF Gwynns Falls Leakin Park Hashawa Hoyles Mill James Long Park Lake Accotink Lake Fairfax Park Laurel Hill Little Bennet Regional Park Loch Raven Reservoir Locust Shade Mckeldin Meadowood Recreation Area Monocacy Natural Resources Area Mount Vernon District Park Muddy Branch Park Northwest Branch Park Patapsco Patapsco Valley State Park Patuxent River State Park Pepco Trail Riverbend Park Rivers Edge Trails Rockburn Branch Park Rosaryville State Park Schaffer Farms Seneca Bluffs Trail Seneca Greenway Seneca Ridge Trail Severn Run SRT Upper Rock Creek Park Wakefield Park Woodstock