Locks On The C&O Canal

The Locks on the C&O Canal, located in Maryland, West Virginia, and Washington, D.C. of the United States, were numbered from 1 to 75 with two locks, 63⅓ and 64⅔, having fractional numbers and no lock 65. There is also a lock at the downstream end of the canal in Washington, DC where Rock Creek flows into the Potomac River which is sometimes called Lock 0 or the Tidewater Lock.

Some of the locks were also informally named, usually after a prominent lockkeeper, a nearby town or important geographical feature. Some locks are known by more than one name and some are only known by their number.

With respect to the fractional locks, it was found that the level of the canal between locks 62 and 66 could be raised in three steps instead of four. So the additional locks through there were numbered 1⅓ steps apart (62, 63⅓, 64⅔ and 66) so that the other locks on the canal did not have to be renumbered.

Lock Miles Name Nearby landmarks Coordinates
0 0.0 Tidewater Lock 38°54′00″N 77°03′29″W / 38.900°N 77.058°W / 38.900; -77.058
1 0.38 Georgetown 38°54′14″N 77°03′29″W / 38.904°N 77.058°W / 38.904; -77.058
2 0.42 Georgetown 38°54′14″N 77°03′32″W / 38.904°N 77.059°W / 38.904; -77.059
3 0.49 Georgetown 38°54′14″N 77°03′32″W / 38.904°N 77.059°W / 38.904; -77.059
4 0.54 Georgetown 38°54′14″N 77°03′40″W / 38.904°N 77.061°W / 38.904; -77.061
5 5.0 Brookmont Lock Brookmont 38°56′24″N 77°07′19″W / 38.940°N 77.122°W / 38.940; -77.122
6 5.4 Magazine Lock Little Falls 38°56′42″N 77°07′26″W / 38.945°N 77.124°W / 38.945; -77.124
7 7.0 Chataqua Lock Glen Echo 38°57′54″N 77°08′20″W / 38.965°N 77.139°W / 38.965; -77.139
8 8.33 Seven Locks 1 38°58′16″N 77°09′40″W / 38.971°N 77.161°W / 38.971; -77.161
9 8.7 Seven Locks 2 38°58′19″N 77°10′01″W / 38.972°N 77.167°W / 38.972; -77.167
10 8.79 Seven Locks 3 38°58′19″N 77°10′08″W / 38.972°N 77.169°W / 38.972; -77.169
11 8.97 Seven Locks 4 38°58′19″N 77°10′19″W / 38.972°N 77.172°W / 38.972; -77.172
12 9.29 Seven Locks 5 38°58′19″N 77°10′41″W / 38.972°N 77.178°W / 38.972; -77.178
13 9.37 Seven Locks 6 American Legion (Cabin John) Bridge 38°58′19″N 77°10′44″W / 38.972°N 77.179°W / 38.972; -77.179
14 9.47 Seven Locks 7 38°58′19″N 77°10′52″W / 38.972°N 77.181°W / 38.972; -77.181
15 13.45 Six Locks 1 Great Falls 38°59′20″N 77°14′38″W / 38.989°N 77.244°W / 38.989; -77.244
16 13.60 Six Locks 2 Great Falls 38°59′31″N 77°14′42″W / 38.992°N 77.245°W / 38.992; -77.245
17 13.99 Six Locks 3 Great Falls 38°59′46″N 77°14′53″W / 38.996°N 77.248°W / 38.996; -77.248
18 13.99 Six Locks 4 Great Falls 38°59′53″N 77°14′56″W / 38.998°N 77.249°W / 38.998; -77.249
19 14.17 Six Locks 5 Great Falls 38°59′56″N 77°14′53″W / 38.999°N 77.248°W / 38.999; -77.248
20 14.30 Six Locks 6 - aka Tavern Lock Great Falls Tavern 39°00′00″N 77°14′53″W / 39.000°N 77.248°W / 39.000; -77.248
21 16.64 Swain's Lock 39°01′55″N 77°14′38″W / 39.032°N 77.244°W / 39.032; -77.244
22 19.63 Pennyfield Lock 39°03′14″N 77°17′20″W / 39.054°N 77.289°W / 39.054; -77.289
23 22.12 Violette's Lock and Inlet Lock 2 39°04′01″N 77°19′44″W / 39.067°N 77.329°W / 39.067; -77.329
24 23.00 Riley's Lock Seneca Creek Aqueduct 39°04′08″N 77°20′24″W / 39.069°N 77.340°W / 39.069; -77.340
25 30.8 Edward's Ferry Poolesville 39°06′11″N 77°28′19″W / 39.103°N 77.472°W / 39.103; -77.472
26 39.4 Wood's Lock 39°12′58″N 77°27′29″W / 39.216°N 77.458°W / 39.216; -77.458
27 41.5 Spinks Ferry Monocacy Aqueduct 39°11′28″N 77°28′16″W / 39.191°N 77.471°W / 39.191; -77.471
28 48.9 Fulton's Lock Point of Rocks 39°16′55″N 77°32′53″W / 39.282°N 77.548°W / 39.282; -77.548
29 50.89 Lander Lock or Catoctin Lock 39°18′25″N 77°33′32″W / 39.307°N 77.559°W / 39.307; -77.559
30 55.0 Brunswick, Maryland 39°18′40″N 77°37′48″W / 39.311°N 77.630°W / 39.311; -77.630
31 58.0 Weverton Lock 39°19′44″N 77°40′52″W / 39.329°N 77.681°W / 39.329; -77.681
32 60.23 Sandy Hook, Maryland 39°19′26″N 77°43′08″W / 39.324°N 77.719°W / 39.324; -77.719
33 60.7 Harper's Ferry 39°19′30″N 77°43′37″W / 39.325°N 77.727°W / 39.325; -77.727
34 61.57 Goodheart's Lock Harper's Ferry 39°19′59″N 77°44′20″W / 39.333°N 77.739°W / 39.333; -77.739
35 62.33 Harper's Ferry 39°20′13″N 77°45′04″W / 39.337°N 77.751°W / 39.337; -77.751
36 62.44 Harper's Ferry 39°20′13″N 77°45′11″W / 39.337°N 77.753°W / 39.337; -77.753
37 66.96 Mountain Lock 39°23′06″N 77°44′06″W / 39.385°N 77.735°W / 39.385; -77.735
38 72.65 Shepherdstown Lock Shepherdstown, West Virginia 39°26′06″N 77°47′53″W / 39.435°N 77.798°W / 39.435; -77.798
39 74.0 One Mile Lock James Rumsey Bridge, Snyder's Landing 39°26′46″N 77°46′59″W / 39.446°N 77.783°W / 39.446; -77.783
40 79.41 Horseshoe Bend 39°29′10″N 77°46′44″W / 39.486°N 77.779°W / 39.486; -77.779
41 88.9 39°31′59″N 77°50′17″W / 39.533°N 77.838°W / 39.533; -77.838
42 89.04 39°31′55″N 77°50′24″W / 39.532°N 77.840°W / 39.532; -77.840
43 92.96 39°32′31″N 77°51′58″W / 39.542°N 77.866°W / 39.542; -77.866
44 99.3 Williamsport Williamsport, Maryland 39°35′38″N 77°49′30″W / 39.594°N 77.825°W / 39.594; -77.825
45 107.27 Two Locks 1 39°36′50″N 77°55′34″W / 39.614°N 77.926°W / 39.614; -77.926
46 107.42 Two Locks 2 39°36′58″N 77°55′37″W / 39.616°N 77.927°W / 39.616; -77.927
47 108.8 Four Locks 1 39°37′01″N 77°56′49″W / 39.617°N 77.947°W / 39.617; -77.947
48 108.8 Four Locks 2 39°36′58″N 77°56′53″W / 39.616°N 77.948°W / 39.616; -77.948
49 108.8 Four Locks 3 39°36′54″N 77°56′56″W / 39.615°N 77.949°W / 39.615; -77.949
50 108.8 Four Locks 4 39°36′50″N 77°56′56″W / 39.614°N 77.949°W / 39.614; -77.949
51 122.59 Hancock 1 Hancock, Maryland 39°41′35″N 78°09′04″W / 39.693°N 78.151°W / 39.693; -78.151
52 122.85 Hancock 2 Hancock, Maryland 39°41′38″N 78°09′22″W / 39.694°N 78.156°W / 39.694; -78.156
53 130.0 Irishman's Lock Leopard's Mill 39°39′04″N 78°14′28″W / 39.651°N 78.241°W / 39.651; -78.241
54 134.0 39°37′26″N 78°17′20″W / 39.624°N 78.289°W / 39.624; -78.289
55 134.0 Near Dam 6 39°37′30″N 78°17′31″W / 39.625°N 78.292°W / 39.625; -78.292
56 136.2 Sideling Lock Sideling Hill 39°38′13″N 78°19′44″W / 39.637°N 78.329°W / 39.637; -78.329
57 139.2 39°37′37″N 78°21′40″W / 39.627°N 78.361°W / 39.627; -78.361
58 143.9 39°37′16″N 78°24′22″W / 39.621°N 78.406°W / 39.621; -78.406
59 146.6 39°36′40″N 78°25′59″W / 39.611°N 78.433°W / 39.611; -78.433
60 149.7 Stickpile Hill 39°34′55″N 78°24′14″W / 39.582°N 78.404°W / 39.582; -78.404
61 153.1 39°35′02″N 78°27′36″W / 39.584°N 78.460°W / 39.584; -78.460
62 154.2 39°34′16″N 78°27′11″W / 39.571°N 78.453°W / 39.571; -78.453
63⅓ 154.5 Paw Paw Tunnel 39°34′01″N 78°27′14″W / 39.567°N 78.454°W / 39.567; -78.454
64⅔ 154.6 39°33′58″N 78°27′18″W / 39.566°N 78.455°W / 39.566; -78.455
66 154.7 39°33′54″N 78°27′25″W / 39.565°N 78.457°W / 39.565; -78.457
67 161.8 Darkey's Lock 39°31′30″N 78°31′59″W / 39.525°N 78.533°W / 39.525; -78.533
68 164.8 Crabtree's Lock 39°31′48″N 78°35′20″W / 39.530°N 78.589°W / 39.530; -78.589
69 166.4 Twigg's Lock 39°32′24″N 78°36′29″W / 39.540°N 78.608°W / 39.540; -78.608
70 166.7 Oldtown 39°32′24″N 78°36′43″W / 39.540°N 78.612°W / 39.540; -78.612
71 167.0 39°32′28″N 78°37′05″W / 39.541°N 78.618°W / 39.541; -78.618
72 174.4 The Narrows or Ten Mile Lock 39°34′30″N 78°43′48″W / 39.575°N 78.730°W / 39.575; -78.730
73 175.4 North Branch 1 39°35′17″N 78°44′10″W / 39.588°N 78.736°W / 39.588; -78.736
74 175.5 North Branch 2 39°35′17″N 78°44′17″W / 39.588°N 78.738°W / 39.588; -78.738
75 175.6 North Branch 3 39°35′13″N 78°44′28″W / 39.587°N 78.741°W / 39.587; -78.741
184.5 End of the canal Cumberland, Maryland 39°38′56″N 78°45′47″W / 39.649°N 78.763°W / 39.649; -78.763

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