Great Falls Dam, Lock No. 20

Low Hazard ConditionEmergency Action Plan: No

Location

StateMaryland
CountyMontgomery
River/StreamC&O Canal
Coordinates39.00169, -77.24927

Physical Characteristics

Dam TypeMasonry
NID Height8 ft
Dam Height8 ft
Year Completed1850 (176 years old)

Storage & Hydraulics

NID Storage51 acre-ft
Max Storage51 acre-ft

Ownership & Safety

PurposeNavigation
OwnerUS Army Corps of Engineers,Washington Aqueduct Div
Owner TypeFederal
Hazard ClassificationLow
Last Inspection09/30/1996
Emergency Action PlanNo

Identifiers

NID IDMD00410
Federal IDMD00410
More InfoState Dam Safety Program

Nearby Dams

Hidden Spring Dam 0.9 mi Undetermined Great Falls Estate Dam 1.0 mi Low Marmota Farm Pond Dam 1.7 mi Undetermined Avenel - Tpc Dam #3 3.1 mi Low Falls Road Golf Course 3.5 mi High Daddy Long Lake Dam 4.2 mi Significant Wolf Trap Farm Pond Dam 4.3 mi Low Crippen Dam 4.4 mi Undetermined Pulte Mclean Swm Pond Dam 4.4 mi High Lake Fairfax Dam 4.5 mi High