BPA Fish and Wildlife FY 1997 Proposal
Section 1. Administrative
Section 2. Narrative
Section 3. Budget
see CBFWA and BPA funding recommendations
Title of project
Lower Snake Natural River Drawdown
BPA project number 5518800
Business name of agency, institution or organization requesting funding
Sponsor type Placeholder
Proposal contact person or principal investigator
BPA technical contact ,
Biological opinion ID Research M&E Program, Hypothesis B3.4
NWPPC Program number
Project would attempt to prove/disprove hypothesis that smolt survival cannot be increased by drawdown of Snake River hydroelectric projects to natural river grade.
Project start year 1997 End year
Start of operation and/or maintenance 0
Project development phase PLANNING
See BPA Project No. 9302900
Biological results achieved
Annual reports and technical papers
Results of study could affect volumes and timing of flows needed during the spring/summer migration; this in turn could affect amount and timing of availability of power from the hydrosystem; drawdowns, depending on the extent, can affect other uses of the dams and reservoirs, e.g., irrigation, recreation, use of juvenile collection facilities, etc. . In addition, the results of this study should clearly either support or counter the use of natural river grade drawdown to improve juvenile salmon survival, thereby directing the use of available funds to those measures that are truly improving the survival of listed stocks.
Specific measureable objectives
Determine: 1) short-term disruption of adult migration and subyearling rearing in MCN pool; 2) extent to which sediments move downstream from LGR pool through to MCN pool; 3) effects on redistribution of predator populations; 4) effects on size and distribution of wildlife and furbearer populations.
SMOLT SURVIVAL CANNOT BE INCREASED BY DRAWDOWN OF SNAKE RIVER HYDROELECTRIC PROJECTS TO RIVER GRADE
Underlying assumptions or critical constraints
Brief schedule of activities
The ability of listed Snake River stocks to recover under a Lower Snake River natural river grade drawdown in complicated by several conditions: 1) population levels may already be so low that genetic and demographic factors may lead to near-term extinction; 2) poor migration conditions and high smolt mortality in the lower Columbia may severly limit overall survival, and overshadow any increase realized in the Snake River; and 3) factors outside the hydro power corridor may have such a major effect on survival of the species that any changes in the migration corridor may be insufficient to change adult escapement. Moreover, it cannot be ruled out that if flow augmentation is reduced in response to implementation of drawdown and reduced smolt travel times, hydrologic conditions in the estuary may be altered (i.e., further degraded) to the degree that estuarine and nearshore ocean survival may decline.
Summary of expected outcome
Dependencies/opportunities for cooperation
|Historic costs||FY 1996 budget data*||Current and future funding needs|
|(none)||New project - no FY96 data available||1997: 500,000|
* For most projects, Authorized is the amount recommended by CBFWA and the Council. Planned is amount currently allocated. Contracted is the amount obligated to date of printout.
CBFWA funding review group System Policy
Recommendation Tier 2 - fund when funds available
Recommended funding level $500,000