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When the canal was opened the level of the lake dropped nearly nine feet (2.7 m). [9] The canal became the lake's sole outlet, causing the Black River to dry up and disappear. Before construction, the Sammamish River was the primary source of water for Lake Washington, and the lowering of the lake slightly increased its flow.
To maintain the water level of the fresh water Lake Washington and Lake Union at 20–22 feet (6.1–6.7 m) above sea level, or more specifically, 20.6 ft (6.3 m) above Puget Sound's mean low tide. [2]: 2 [3] [5]: 8 To prevent the mixing of sea water from Puget Sound with the fresh water of the lakes (saltwater intrusion). [2]: 2–3
Lake Washington Ship Canal: Lake Washington [n 3] Gravity 0 26 7.9 458,000 565,000 1916 U.S. Army Corps of Engineers: Navigation Howard A. Hanson Dam: King: Green River: Howard A. Hanson Reservoir: Earthfill 235 72 136,700 168,600 1961 U.S. Army Corps of Engineers: Flood control, Water supply John Day Dam† Klickitat: Columbia River: Lake ...
The Lake Washington Ship Canal is a canal that runs through the city of Seattle and connects the fresh water body of Lake Washington to the salt water inland sea of Puget Sound. The Hiram M. Chittenden Locks accommodate the approximately 20-foot (6.1 m) difference in water level between Lake Washington and the sound.
Following the completion of the Lake Washington Ship Canal and Hiram M. Chittenden Locks in 1917, the water level of Lake Washington was lowered 8.8 feet (2.7 m) exposing the lake bed along the course of the present-day slough. The Mercer Slough was partially dredged in the 1920s to make it navigable to small watercraft.
In 1912, the Cedar was diverted from the Black River into Lake Washington to avoid future floods. Its water still flowed through the Black after passing through Lake Washington. In 1916, with the opening of the Lake Washington Ship Canal in Seattle, the lake's level dropped nearly nine feet and the Black River dried up. [4] Today, part of its ...
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The water level of Spirit Lake is maintained at about 3,406 ft (1,040 m) by draining water through Spirit Lake Outlet Tunnel, a gravity-feed tunnel completed in 1985. The 8,465-foot-long (2,580 m) tunnel was cut through Harrys Ridge to South Coldwater Creek, which flows to Coldwater Lake and into the North Fork of the Toutle River.