McDevitt Diversion Project

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• Email Becky Gallaher

Project Sponsor:
Chelan County Conservation District

Funding:
Rock Island Tributary Fund

Project Location:
The project site is located on Chumstick Creek approximately 1100 feet upstream from the confluence with the Wenatchee River.

Project Description/Purpose:
The existing diversion and pumping facilities are in poor condition, requiring annual maintenance and repair, and the weir precludes upstream passage of most fish during the irrigation season and especially at low flows.

The purpose of the McDevitt Diversion project is to install a low-maintenance water diversion that provides fish passage through the diversion site at all times and to screen the intake pipe to prevent the entrainment of juvenile fish. The plan is to replace the existing 1.5-foot high weir, consisting of wood planks installed across the creek with a boulder weir at the riffle below the existing weir. The proposed weir will be constructed by rearranging existing boulders within and adjacent to the channel to concentrate flow through a 3-foot wide gap between boulders. A new pump passive screed will be installed in the gap and connect to a 4-inch diameter flexible hose that will convey water directly to the existing pump.  Concentration of flow between the boulders would increase water depth sufficiently to provide adequate hydraulic head and sweeping flows at the proposed screen during low-flow conditions. During high-flow conditions the screen would be moved a few feet to a location near the left stream bank. The flexible hose would accommodate the seasonal relocation of the screen in response to changes in stream discharge.

The McDevitt Diversion Project was completed in August 2006. The new system was tested for several days and was successful at even low stream flows.

he existing diversion and pumping facilities are in poor condition and require annual maintenance/repair. The weir precludes upstream fish passage during the irrigation season.  The goal of this project is to install a low-maintenance water diversion that provides fish passage at all times and to screen the intake pipe to prevent the entrainment of juvenile fish.

The McDevitt Diversion Project was completed in August 2006. The new system was tested for several days and was successful at even low stream flows.

Final Report:
McDevitt Diversion Project 2005-01 RI

For more information, please contact Keith Truscott or Becky Gallaher at (509) 663-8121, or Tom Kahler at (509) 884-8171.

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