USASCE Lake Washington annual summer refill

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#1 February 15, 2017 - 9:58am

Sound Suite

From Local Notice to Mariners

The U.S. Army Corps of Engineers officials will begin Lake Washington's annual summer refill operations 16 Feb 17. Vessel owners should closely

monitor lake elevations and adjust mooring lines as necessary. Water managers are targeting a typical annual refill of the lake to elevation 22

feet this spring. Fill rates and target elevations vary through May based on conditions. Refilling the lake to 22 feet will help meet increased

summer water use, providing water necessary for fish passage, navigation and salinity control. Private and commercial maritime interests along

Lake Washington Ship Canal and in Lakes Washington and Union should expect a gradual rise from the winter level of 20 feet until the 22-foot

target refill elevation is reached around 01 Jun 17. The official lake level is measured at the Locks. The 22-foot target elevation is referenced

he local project datum and is equivalent to 18.75 feet referenced to the North American Vertical Datum of 1988. Lake Washington and Lake

Union levels may vary due to the natural gradient between the lake and the locks or wind that can push the lake levels up for short durations.

Depending on conditions, the lake may remain at the maximum target elevation through June and July. More information on Lake Washington's

status is available on the Corps' Seattle District Reservoir Control Center website at http://bit.ly/MWS-RCC. For more information about

activities at the Locks, visit the Locks' Web site at http://bit.ly/BallardLocks, the Locks on Facebook at www.facebook.com/ChittendenLocks and