The canal's 36 original locks addressed the elevation differential of about 565 feet as the waterway climbed from the Hudson River to Lake Erie. A lock is a section of waterway that can be made watertight by closing gates at both ends; water is then pumped into the section to raise the watercraft waiting inside the lock. Shippers paid duties based on the tonnage of their cargo, and the canal boats were weighed at weigh locks, only one of which survives (anywhere in the US) and now houses the Museum.
The highlight of the museum is an actual canal boat, now in permanent drydock, as it were, which visitors can investigate. Many canal boats were family-owned, so, in addition to carrying cargo and passengers, these vessels served as houseboats. Young children wore harnesses so they could be pulled up out of the water quickly in case of falling overboard.
The museum also recreated the weighmaster's office, with its desk-with-a-thousand-cubbies, and all-important stove, and has exhibits depicting a period tavern and general store and lots of info on the construction and planning of "Governor Clinton's Ditch," as the project was derisively labelled when first envisioned.