The Hiram M. Chittenden Locks are operated by the U.S. Army Corps of Engineers.
Construction of the Lake Washington Ship Canal and Hiram M. Chittenden Locks was completed in 1917 by the U.S. Army Corps of Engineers. Connecting the waters of Lake Washington, Lake Union, and Salmon Bay to the tidal waters of Puget Sound, the canal and locks allow recreational and commercial vessels to travel to the docks and warehouses of Seattle's busy fresh water harbor.anadromous fish, notably salmon.
The locks and associated facilities serve three purposes:
• To maintain the water level of the fresh water Lake Washington and Lake Union at 20 to 22 feet above sea level.
• To prevent the mixing of sea water from Puget Sound with the fresh water of the lakes (saltwater intrusion).
• To move boats from the water level of the lakes to the water level of Puget Sound, and vice versa.
The complex includes two locks, a small (30 x 150 ft, 8.5 x 45.7 meter) and a large (80 x 825, 24.4 x 251.5 meter). The complex also includes a (235-foot, 71.6 meter) spillway with six (32 x 12-foot (3.7 m), 9.8 x 3.7 meter) gates to assist in water-level control. A fish ladder is integrated into the locks for migration of anadromous fish, notably salmon.
The grounds feature a visitors center, as well as the Carl S. English, Jr. Botanical Gardens.
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