C&O Canal GPS Coordinates

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Locks

Latitude	Longitude	Title
38° 54.229	77° 03.452	Lock 1
Located between 28th and 29th Streets.
38° 54.236	77° 03.511	Lock 2
Between 29th and 30th Streets. 29th Street was originally Green Street and the bridge crossing was rebuilt of iron in the 1860s to provide a higher clearance for unladen canal boats. After the canal was abandonded, the bridges were rebuilt again.
38° 54.239	77° 03.569	Lock 3
The park service's canal boat docks here between its scheduled excusions upstream. Just north is the Georgetown Visitor Center and across the canal to the south is the building that was once Duvall's Foundry. For long distance travelers of the canal towpath, there is a public water fountain here.
38° 54.244	77° 03.630	Lock 4
Located between Thomas Jefferson and 31st Streets.
38° 56.390	77° 07.312	Lock 5 - Brookmont Lock
Park at Lock #6 and walk down from there. There is a guard lock into the Potomac River adjacent to Lock #5 at this location
38° 56.682	77° 07.431	Lock 6 - Magazine Lock
Nearby is the point where President Adams broke ground for the construction of the Canal in 1828.
38° 57.882	77° 08.350	Lock 7 - Chataqua Lock
This lock has a drop gate instead of a swing gate on the upstream end. Parking onsite.
38° 58.270	77° 09.683	Lock 8 - Seven Locks 1
First of the Seven Locks
38° 58.336	77° 10.018	Lock 9 - Seven Locks 2
Second of the Seven Locks. Park at lock 8 or 10 and walk from there.
38° 58.337	77° 10.124	Lock 10 - Seven Locks 3
Third of the Seven Locks. Parking is located onsite. This is the last canal access point with parking before Carderock.
38° 58.341	77° 10.334	Lock 11 - Seven Locks 4
Fourth of the Seven Locks. Park at Lock 10.
38° 58.346	77° 10.667	Lock 12 - Seven Locks 5
Fifth of the Seven Locks. Park at Lock #10
38° 58.332	77° 10.766	Lock 13 - Seven Locks 6
Sixth of the Seven Locks. This lock is located directly beneath the American Legion Bridge which carries I-495 over the Clara Barton Parkway, the C& O Canal and the Potomac River. Park at Lock #10.
38° 58.325	77° 10.850	Lock 14 - Seven Locks 7
Seventh of the Seven Locks. Park at Lock 10.
39° 01.898	77° 14.622	Lock 21 - Swain's Lock
Swain's Lock is reached by turning off of River Road onto Swains Lock road and following it to the end. There is river access on the far side of the canal. Fishing, canoeing and kayaking are very popular here, although the small shack that used to sell refreshments, bait and tackle and rent small boats is now closed indefinately.
38° 59.366	77° 14.650	Lock 15 - Six Locks 1
First of the "Six Locks". Just south of Great Falls Park.
38° 59.525	77° 14.671	Lock 16 - Six Locks 2
Second of the "Six Locks". There is an interesting stop lock just north of this lock between here and lock 17. Parking is at Great Falls park for this entire set of locks.
38° 59.777	77° 14.876	Lock 17 - Six Locks 3
Third of the "Six Locks". Nearby is trail access to Olmstead Island and the overlook of Great Falls and the Potomac Gorge.
38° 59.921	77° 14.907	Lock 19 - Six Locks 5
Fifth of the "Six Locks".
39° 00.012	77° 14.907	Lock 20 - Six Locks 6 - aka Tavern Lock
Adjacent to the Great Falls Tavern in Great Falls National Park. The tavern, once a popular provisioning stop along the canal, is now a visitor's center with refreshments, a museum and a bookstore. There are plenty of hiking trails in the park as well.
38° 59.859	77° 14.913	Lock 18 - Six Locks 4
Fourth of the "Six Locks". Located in Great Falls Park.
39° 03.237	77° 17.335	Lock 22 - Pennyfield Lock
Pennyfield Lock
39° 4.028	77° 19.742	Lock 23 - Violette's Lock
Lock 23
39° 04.120	77° 20.419	Lock 24 - Riley's Lock
Lock 24 near Seneca
39° 12.968	77° 27.477	Lock 27 - Spink's Lock
In 1862, Confederate troops disabled this lock, its reconstruction accounting for the two different types of stone used in its construction. The lockhouse still stands on the towpath side.
39° 11.475	77° 28.285	Lock 26 - Wood's Lock
Wood's Lock was built of red sandstone and has an enormous maple tree next to the lockhouse ruins.
39° 06.207	77° 28.333	Lock 25
Lock 25 at Edwards Ferry
39° 16.894	77° 32.863	Lock 28
Built mostly of hard white flint-stone with some granite.
39° 18.396	77° 33.515	Lock 29 - Lander Lock
Granite and whit flintstone construction with a brick lockhouse nearby.
39° 18.684	77° 37.817	Lock 30
Located at Brunswick where MD17 croses the Potomac River. There is also boat launch here.
39° 19.756	77° 40.842	Lock 31 - Weaverton Lock
Behind the lockout lies Weaverton Heights, site of a Union observation outpost during the Civil War.
39° 19.440	77° 43.111	Lock 32
Limestone construction.
39° 19.480	77° 43.594	Lock 33
The building on the far side of the canal has been variously identified as Spencer's Store or the Elgin House. The lockhouse, long gone, was on the towpath side of the canal.
39° 23.112	77° 44.095	Lock 37 - Mountain Lock
Built of blue-grey limestone and with a surviving lockhouse.
39° 19.988	77° 44.324	Lock 34
There is a water pump here as well as access to the river. Tours will drop of busloads of people with inner tubes to float down through the rapids at Harpers Ferry.
39° 20.207	77° 45.042	Lock 35
The lock can be seen across the inlet channel but is not accessable from her. One must travel to Lock 36 and come back. The trail veers south towards the river and then back.
39° 20.238	77° 45.201	Lock 36
Built of grey limestone.
39° 29.143	77° 46.769	Lock 40
Severly damaged during one of Jubal Early's raids in July of 1864.
39° 26.740	77° 46.962	Lock 39 - One Mile Lock
Also known as Hahn Lock.
39° 26.123	77° 47.899	Lock 38
Lock 38 near Shepherdstown
39° 35.653	77° 49.526	Lock 44
With a newly restored lockhouse.
39° 31.987	77° 50.292	Lock 41
Canal boats would enter and exit the Big Slackwater through this lock. The towpath crosses and runs along the Potomac River from here to McMahon's Mill. The towpath used to continue downstream further but repeaded flooding has made this section of trail impassable.
39° 31.910	77° 50.404	Lock 42
Built near to lock 41 to quickly raise the canal level to the preferred 16 feet above the river.
39° 32.532	77° 51.967	Lock 43
Built of blue-gray limestone with a whitewashed brick lockhouse.
39° 36.853	77° 55.556	Lock 45
Both an inlet lock and a lift lock.
39° 36.944	77° 55.624	Lock 46
Has the lockhouse for the keeper of both this lock and lock 45.
39° 37.009	77° 56.812	Lock 47
The other side of the lock's bypass flume has the remenants of a drydock used for canal boat repairs.
39° 36.966	77° 56.857	Lock 48
In 1875-76, the Smith & Brother Store was built over the bypass flume.
39° 36.891	77° 56.911	Lock 49
The brick lockhouse on the opposite berm was the official home of the keeper of the "Four Locks" but duties were shared by the entire community.
39° 36.833	77° 56.944	Lock 50
A small wooden waithouse for the lockkeeper stand on the upstream berm side of the lock. The Park Service has reconstructed a barn for wintering mules 200 feet upstream.
39° 41.589	78° 08.917	Lock 51
Lock 51 near Hancock was constructed of grey limestone. The ruins of a stone lockhouse, built of limestone and red shale, stand on the river side of the towpath.
39° 41.640	78° 09.384	Lock 52
MP 122.9 This lock is nearly close enough to the aqueduct to have been constructed as a single structure.
39° 39.055	78° 14.517	Lock 53
MP 130.1 - Lock 53 built of limestone. Ony the foundation for the lockhouse remains on the other of the lock.
39° 37.424	78° 17.362	Lock 54
Lock 54.
39° 37.509	78° 17.504	Lock 55
This lock has a connecting bridge with the Western Maryland Rail Tral (WMRT). I believe this is the western-most connection point between the two trails.
39° 38.230	78° 19.719	Lock 56
Lockhouse and a parking area off of Pearre Rd.
39° 37.635	78° 21.675	Lock 57
A stone foundation and chimney are all that ramains of the lockhouse.
39° 34.947	78° 24.230	Lock 60
Lock is near Stickpile Hill Campground
39° 37.230	78° 24.339	Lock 58
Mike High's 'The C&O Canal Companion' notes that this lock was probably the last lock to be completed before the canal opened in 1850. This is the first in a series of 'composite' locks which were partly made of wood because of a lack of suitable stone. Directly behind this lock is a sign detailing trails of the Green Ridge State Forest.
39° 36.671	78° 25.955	Lock 59
The remains of the Lockkeeper's house foundation are easily visible.
39° 34.264	78° 27.167	Lock 62
A composite lock, with the foundation of the lockkeeper's house nearby.
39° 34.015	78° 27.249	Lock 63 1/3
The first in a series of 3 nearby locks that raised the canal boats to an appropriate level to get through the Paw Paw Tunnel.
39° 33.945	78° 27.320	Lock 64 2/3
The middle of 3 locks in quick succession before the Paw Paw Tunnel. The following was taken from Mike High's 'The C&O Companion', who recounts George 'Hooper' Wolfe's story about the lockkeepr at this lock: It seems that the lockkeeper in this isolated stretch of the canal was well known for his collection of rare coins. The keeper was found murdered one night. Months later in Cumberland's Shantytown neighborhood, a stranger was noticed buying drinks with one of the rare coins. They seized the stranger and found more coins in his possesion. The man was tried and convicted of murder and later hung.
39° 33.881	78° 27.404	Lock 66
The last lock before the Paw Paw Tunnel. There is no Lock 65.
39° 35.036	78° 27.591	Lock 61
Lock has been damned up with stone on its upstream end.
39° 31.528	78° 31.978	Lock 67 - Darkey's Lock
A composite lock, inexpensively built with stone fill and timbers rather than cut stone.
39° 31.826	78° 35.318	Lock 68 - Crabtree's Lock
This watered section of the canal has many lillypads, making this lock and the frame lockhouse quite scenic.

Aqueducts

Latitude	Longitude	Title
39° 25.050	77° 44.750	Antietam Aqueduct
Antietam Aqueduct, completed in 1834, is one of eleven that were once a part of the Chesapeake and Ohio Canal. This blue-gray limestone aqueduct, which no longer has water in it, is in the best shape of any of the multi-arched C and O aqueducts which remain standing.
39° 36.064	77° 49.635	Conococheague Creek Aqueduct
Conococheague Creek Aqueduct near Williamsport, MD. This aqueduct is part of the C&O Canal between Georgetown and Cumberland. This one was built in 1834 and on April 20, 1920 Capt. Frank Myers was steering boat #73 into the aqueduct and lightly bumped the upstream wall which gave way. The aqeduct was repaired with a wooden wall until the flood of 1924 closed the canal for good...
39° 39.068	78° 02.914	Licking Creek Aqueduct
This is the longest single-span aqueduct along the C&O Canal.
39° 41.637	78° 09.404	Tonoloway Creek Aqueduct
Single arch aqueduct over Tonoloway Creek. The aqueduct is supported by steel beams placed by the Park Service due to wear.
39° 37.496	78° 44.395	Evitts Creek Aqueduct
Evitts Creek Aqueduct

Campgrounds

Latitude	Longitude	Title
39° 17.925	77° 33.440	Bald Eagle Island Campground
Bald Eagle Island Campground
39° 41.104	78° 06.784	Little Pool Campground
This campground is one of the larger ones and is located directly across from the Little Pool lake.
39° 40.689	78° 12.583	White Rock Campground
A small campsite close to Hancock.
39° 39.127	78° 14.408	Leopard's Mill Campsite
Campsite is close to Lock 55, which crosses over to the Western Maryland Rail Trail.
39° 37.311	78° 16.945	Capacon Junction Campsite
This campsite has a nice view across the river of where the Capacon River joins the Potomac along with the railroad arch that crosses it.
39° 39.024	78° 2.905	Licking Creek Campground
A campground located between Big Pool and Little Pool. The campground is very close to the Licking Creek Aqueduct.
39° 37.518	78° 23.136	15 Mile Creek Campground
15 Mile Creek Campground
39° 35.015	78° 23.887	Stickpile Hill Campground
Stickpile Hill Campground
39° 37.361	78° 24.806	Devils Alley Campground
Devils Alley Campground
39° 34.284	78° 27.184	Sorrel Ridge Campground
Sorrel Ridge Campground
39° 32.333	78° 39.046	Pigsmans Ferry Campground
Pigsmans Ferry Campground
39° 35.266	78° 44.139	Iron Mountain Campground
Iron Mountain Campground

Trailheads

Latitude	Longitude	Title
39° 31.989	77° 50.260	McMahon's Mill
Restored by the Park Service, this structure has been called Charles Mill, Cedar Grove Mill, Dhaffer's Old Flouring Mills and Avis Mill. Downy Branch Creek just across from the mill is a great place to wade in and cool your feet. This is the western end of the Big Slackwater detour as flooding damage has made the towpath impassable.
39° 36.355	78° 00.291	Fort Frederick Trailhead
Parking for the C&O Canal at Fort Frederick. Park here and cross the bridge to get onto the trail at approximately mile 112.
39° 38.494	78° 45.483	Cumberland Trailhead
This is the beginning (or the end) of the C&O Canal trail. Several shops and a museum about the trail are located here.

Historic Crossings

Latitude	Longitude	Title
39° 36.500	77° 58.190	McCoy's Ferry
This campground/historic site if the location of two Civil War crossings. There is a historic marker, as well as ample camping and a boat launch.

Misc.

Latitude	Longitude	Title
38° 53.995	77° 03.457	Mile Marker Zero
A concrete marker at the tidewater lock next to Thompson's Boat Center. Only fragments remain of the lock gate and the lock itself is filled with silt and debris.
39° 16.393	77° 32.428	Flood Pole
Markings on this pole indicate various high water marks of the Potomac River. At knee-level are floods of 1975 and 79. At hip level in 1976. At twice my height in 1996 and a foot above that in 1972. Realize that the pole is several hundred feet from the river and about 20 feet above it's normal level.
39° 40.669	78° 14.06	Roundtop Cement Mill
A row of eight stone arches are perched in the rock face on the berm side of the canal. These were the limestone kilns at the cement mill.
39° 37.944	78° 01.765	Crossover to Western Maryland Rail Trail
This location provides an opportunity to cross to the paved Western Maryland Rail Trail.
39° 41.884	78° 10.424	Hancock Visitor Center
Hancock Visitor Center
39° 33.571	78° 27.701	Eastern Entrance into the Paw Paw Tunnel
This is the eastern entrance into the Paw Paw tunnel, between miles 155 and 156.
39° 33.004	78° 27.779	Western Entrance into the Paw Paw Tunnel
This is the western entrance into the Paw Paw tunnel, between miles 155 and 156.
39° 32.387	78° 36.482	Sorrells' Grave
A single Civil War-era grave stone marked "Ashmon Sorrell Co.B. 2nd Md.P.H.B.INF."