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
Pahsimeroi River Fish Loss and Irrigation Intake Assessment
BPA project number 5501800
Business name of agency, institution or organization requesting funding
Sponsor type ID-State/Local Agency
Proposal contact person or principal investigator
|Name||John Der Hovanisian|
|Mailing address||Idaho Department of Fish and Game
868 East Main Street
Jerome, ID 83338
BPA technical contact , EWP
Biological opinion ID
NWPPC Program number 10.2C.2
Project will determine if losses of bull trout to irrigation diversions on the Pahsimeroi River impact the population. Project will also install and evaluate alternative irrigation intake systems (e.g., filtration) in view of the high costs, construction impacts, operation/maintenance requirements, and vulnerability to ice and flooding associated with drum screens.
Project start year 1997 End year 2001
Start of operation and/or maintenance 2001
Project development phase IMPLEMENTATION
This project is related to anadromous fish screen projects on the Pahsimeroi River under the Idaho Model Watershed Habitat Project # 9401700.
Biological results achieved
Annual reports and technical papers
Specific measureable objectives
Statistically significant decrease in bull trout and rainbow trout lost through irrigation diversions. Statistically significant increase in bull trout and rainbow trout population size, spawning (redd counts), and increased fry to adult survival.
1. Losses to irrigation diversions do not impact the bull trout population in the Pahsimeroi River.
2. Drum screens are similar to alternative irrigation intake designs in terms of installation, operation and maintenance costs, construction impacts, operation/maintenance requirements, and durability under winter conditions.
Underlying assumptions or critical constraints
Losses to irrigation diversions are limiting the Pahsimeroi River bull trout population.
The proportion of the bull trout population intercepted, or “exploited”, by irrigation diversions will be estimated by a mark-recapture study. Approximately 250 age 0 fish, assuming 30% interception, and 950 age 1 and older fish, assuming 10% interception, will need to be marked to estimate proportions with 10% coefficient of variation. Fish will be captured with screw traps in the mainstem, marked, released, and recaptured in bypass traps placed in screened diversions. The impact of this source of exploitation on the bull trout population will be modeled with program MOCPOP. Impacts on cutthroat trout, steelhead trout, and chinook salmon will also be investigated. Alternative irrigation intakes will be designed, installed, and monitored at three sites. Data will be collected on costs, construction impacts, operation and maintenance requirements, and durability for comparison with associated drum screen variables.
Brief schedule of activities
Fish loss assessment will occur during 1997. The mark-recapture experiment will be conducted from April through September. Alternative irrigation intake systems will be designed in 1996 and installed in summer 1997 and 1998. These systems will be monitored throughout the year during the period 1998-2001.
Losses to irrigation diversions may adversely impact the bull trout population in the Pahsimeroi River. We need to determine if this is the case. If losses are shown to significantly impact the bull trout population, drum screens may reduce these losses. However, drum screens are expensive and difficult to install, operate, and maintain. Alternative irrigation intake systems may be cost-effective substitutes for drum screens.
Preventing the emigration of bull trout into irrigation diversions may not reverse population declines since critical habitats are dewatered in the Pahsimeroi drainage. Irrigators may not be receptive to alternative irrigation intake designs.
Summary of expected outcome
The expected outcomes are 1) irrigation diversions impact bull trout, and 2) alternative irrigation intake systems are cheaper and easier to operate/maintain than drum screens. If the later proves to be true, alternative intake systems may be installed at a greater number of sites. Better coverage of irrigation diversions in the Pahsimeroi River drainage could translate into fewer losses and an increase in the bull trout population. Since cutthroat trout, steelhead trout, and chinook salmon are also prone to interception by irrigation diversions, these species would also be expected to benefit by reducing losses to canals.
Dependencies/opportunities for cooperation
Project is contingent on NMFS/USFS/COE/NRCS/Sho-Ban Tribe consent and/or permits, and the cooperation of irrigators.
Alternative irrigation intake systems may not effectively deliver water to irrigators.
Mark-recapture experiments and/or weir counts will be used to monitor bull trout populations. Costs, installation procedures and problems, operation/maintenance requirements, etc. will be documented for the alternative intake systems.
|Historic costs||FY 1996 budget data*||Current and future funding needs|
|(none)||New project - no FY96 data available||1997: 181,640|
* 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 Resident Fish
Recommendation Tier 2 - fund when funds available
Recommended funding level $181,640