This one was erected in 1825, automated in 1917, and closed in 1939. It is part of Aberdeen Proving Ground and not open to the public. Barges loaded with coal and farm products and pulled by mules once carried goods 45 miles up the Susquehanna and Tidewater Canal between Havre de Grace and Wrightsville, Pennsylvania. The museum is located at the southern end of the canal, which is no longer in use. The 1836 lockhouse, built in 1840, has been restored.
Demonstrations show how the lock worked.
There is also a replica of a canning house. The museum is located on a bluff overlooking the Susquehanna River. Special events include Civil War remembrances, the Scottish Festival, a fall harvest festival, and a Christmas open house. This famous museum features excellent examples of Chesapeake Bay working decoys. An annual Duck Fair in September draws decoy carvers, artists, duck callers, and decoy buyers from up and down the East Coast.