Garrett Park topographic map

Average elevation: 133 m

Average elevation: 114 m

Average elevation: 117 m

Average elevation: 84 m

Average elevation: 139 m

Average elevation: 109 m

Average elevation: 116 m

Average elevation: 133 m

Average elevation: 214 m

Average elevation: 177 m

Average elevation: 101 m

Average elevation: 139 m

Average elevation: 173 m

Average elevation: 82 m

The rocks of the falls date to the late Precambrian and are about 750 million years old. The rocks are a resistant metamorphized schist, gneisses, metagraywackes, and metaconglomerates. The Falls formed the last time sea level dropped, during the Last Glacial Period about 35,000 years ago, causing the Potomac…

Average elevation: 73 m

Seneca is located close to the intersection of River Road (Maryland Route 190), Seneca Road (Maryland route 112), and Rileys Lock Road, east of Great Seneca Creek and north of the Potomac River. The C&O Canal runs along the river, and Riley's Lock is the closest canal lock. The southern portion of Seneca Creek…

Average elevation: 82 m

Average elevation: 134 m

Average elevation: 127 m

Average elevation: 93 m

Average elevation: 107 m

Average elevation: 136 m

Average elevation: 111 m

Average elevation: 139 m

Average elevation: 96 m

Average elevation: 104 m

Average elevation: 147 m

Average elevation: 85 m

Average elevation: 92 m

Average elevation: 143 m

Average elevation: 114 m

Average elevation: 97 m

Average elevation: 93 m

Average elevation: 128 m