Columbia River Basin Water Management Program Mill Creek Water Storage Feasibility Study Lake Roosev

1
Columbia River Basin Water Management Program
Mill Creek Water Storage Feasibility Study
Lake Roosevelt Forum April 13, 2009
2
WRIA 59 Colville River WatershedMill Creek Water
Storage

• Project Applicant/Sponsor
• Partially Prepared by

Stevens Public Utility District PO Box 592 Loon
Lake, Washington, 99148-0592 General
Manager/Engineer Dick Price, PE
HDR Engineering, Inc. 1001 SW 5th Avenue, Suite
1800 Portland, OR 97204-1134 Project Manager
Ron Mason, PE
With assistance from
Stevens County Watershed Planning
Office Courthouse Annex, 215 S. Oak St. Colville,
WA 99114 Project Manager Linda Kiefer
3
Mill Creek Water Storage Project Site
Mill Creek
Within the WRIA 59 Colville River Watershed
4
Drainage Area Map
Mill Creek Storage Site Watershed
5
Normal Annual Precipitation
Mill Creek Storage Basin-wide Mean Precipitation
36.2
6
Mill Creek Storage Site

• Potential Project Purposes
• Benefit for instream flows Low flow
  augmentation
• Reduction of flooding
• Benefit to current water users / water rights
• Provide additional water to meet future water use
  needs
• Micro-Hydropower opportunities

7
Mill Creek Hydrology

• Stream Gages
• USGS Stream Gage 12408500 41 years of record
• Used for project analysis
• Gage discontinued in 1986
• WRIA 59 Stream Gage Project 2007 New Mill
  Creek Gage Installed
• Site Information
• Drainage area 41 square miles
• Estimated Annual runoff (A-F/mile) 425
• Estimated Annual runoff (acre feet) 17,442

8
Mill Creek Storage SiteElevation vs. Storage
Curve
9
Mill Creek Storage Project
Mill Creek Inundation
10
Mill Creek Storage Site
Major Study Elements

• Biological and environmental coordination
  throughout the scoping process
• Site survey
• Develop project hydrology
• Determine site location for spillway
• Preliminary hydraulics to determine size type
  of spillway
• Type size of regulating outlet
• Geotechnical investigations

11
Mill Creek Storage Site
Major Study Elements, contd

• Test pits soil samples
• Lab testing of soil samples
• Determine possible types of embankment
• Construction quantities
• Project alternatives analysis
• Project drawings, (CADD)
• Construction cost estimates
• Project recommendation
• Feasibility report
• Quality control review

12
Mill Creek Storage Site

• Current Project support
• Conducted one scoping meeting with Department of
  Ecology Department of Fish and Wildlife on
  November 13, 2007
• Stevens County Commissioners Stevens Public
  Utility District
• Local Support of Colville River (WRIA 59)
  Watershed Water Resource Management Board
• P.U.D. has option to purchase 40 acres where the
  structure would be located.

13
Questions??

• Contacts
• Richard (Dick) Price, General Manager, Stevens
  PUD _at_ [phone]
• Ron Mason, Project Manager, HDR Engineering, Inc.
  _at_ [phone]
• Linda Kiefer, WRIA 59 Watershed Project Manager
  Stevens County _at_ [phone]