The Hiram M. Chittenden Locks are a complex of locks that sit in the
middle of Salmon Bay, part of Seattle’s Lake Washington Ship Canal.
They are known locally as the Ballard Locks after the neighborhood to
their north. (Magnolia lies to the south.)
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.