Grant County PUD

As part of the objective of achieving at least 95% survival of Anadromous salmonid smolts passing Wanapum Dam, the Grant County Public Utility District plans to provide an alternative passage route that affords the opportunity for smolts to bypass the turbines.

The Future Unit Fish Bypass (FUFB) consists of a 290 foot long chute with an opening of 18.5 foot and an exit width of 90 feet. The “chute” will carry a bypass flow of 20,000 cubic feet per second (cfs). Vertical and inclined gates will make it possible to set lower flow rates.

Movable Camera showing major
work in progress. Will be moved
to capture the action.

Fixed Camera

Wanapum Future Unit Fish Bypass

Wanapum Future Unit Bypass
Concrete Pour Video

Divers at bedrock, below water downstream of Wanapum Dam can be detected from bubbles visible on the surface. The divers are helping to guide placement of ecology blocks being set in place for further work on the Wanapum Future Unit Fish Bypass.

Project Started June 1, 2005

Anticipated Completion December 2007

Nominal full bypass flow of 20,000 cfs

Finished opening through concrete is 18.5 feet wide

Length of 290 feet from upstream to downstream end

Exit chute width of 90 feet

Concrete Removal	1,400 Cubic Yards
General Excavation	12,000 Cubic Yards
Rock Excavation	2,200 Cubic Yards
Chute Foundation	25,000 Cubic Yards
Cast in Place Concrete	15,000 Cubic Yards
Fabricated steel items	1,200,000 lbs
Stainess Steel Guiderails	125,000 lbs
Hydraulic Cylinders	2 @ 45 feet, 2 @ 24 feet
Backfill Material	5,000 Cubic Yards

Public Utility District No. 2 of Grant County
30 C Street SW, P.O. Box 878, Ephrata WA 98823
(509) 754-0500 - Toll Free in WA State 1-800-422-3199