Proposal title | Dworshak Dam Impacts Assessement and Fisheries Investigation |
Proposal ID | 198709900 |
Organization | Idaho Department of Fish and Game (IDFG) |
Proposal contact person or principal investigator |
Name | Melo A. Maiolie, Ph.D |
Mailing address | PO Box 806 Bayview, Id 83803 |
Phone / email | 2086833054 / mmaiolie@micron.net |
Manager authorizing this project | Steve Yundt, State Research Manager |
Review cycle | FY 2001 Ongoing |
Province / Subbasin | Mountain Snake / Clearwater |
Short description | Determines ways to minimize entrainment losses of fish into Dworshak Dam. Also, evaluates impacts to the kokanee population caused by drawdowns and routine operations of the dam. |
Target species | |
Year | Accomplishment |
1990 |
Reservoir fishery documented by creel survey (1988 - 1990). |
1993 |
Fishery objectives defined for waters of this type and productivity. Published in Rieman and Maiolie 1995. |
1994 |
Selector gates on dam utilized to reduce kokanee losses during a winter of low flow and resulted in a record high kokanee population. |
1995 |
Selector gates again utilized to reduce kokanee losses during winter of low flow and second record high kokanee population was produced. |
1995 |
Eighty foot drawdowns of reservoir to provide anadromous fish flows were found to have minimal impacts on the kokanee population. |
1996 |
We successfully monitored kokanee abundance in reservoir throughout the year and during a flood event when selector gates could not be used due to low pool elevation. Ninety five percent of the kokanee population was lost. |
1997 |
Strobe light testing began. Kokanee repelled by lights during open water tests on free ranging fish. |
1998 |
Winter strobe light test conducted and found to be even more effective than during summer. |
1998 |
Tests conducted with downward pointing strobe lights were found to repel kokanee. |
1999 |
Hydroacoustic equipment tested in front of turbine intakes shows promise for monitoring entrainment and strobe light effectiveness. |
1999 |
Hydroacoustic estimates of kokanee abundance, verified by trawling, showed a recovering kokanee population warranting further strobe light testing. |
2000 |
Strobe light testing schedule and construction of floating research platform approved by Dworshak Natural Resource Department of the U.S. Army Corps of Engineers. |
2000 |
Construction of floating research platform completed and located on site. It is now (April 2000) awaiting installation of strobe light equipment and will be soon ready for testing. |
Objective | Task | Duration in FYs | Estimated 2001 cost | Subcontractor |
1. Increase the kokanee population to 30 to 50 adults/ha by reducing entrainment losses. This can be accomplished if annual survival rate for each year class of kokanee can be increased to 50%. |
a. Pre-project strobe light testing on site for their potential effectiveness at repelling kokanee from the turbine intakes |
completed |
$0 |
|
|
b. Consultation with engineers from strobe light and hydroacoustic equipment manufacturers to establish research protocol. |
completed |
$0 |
|
|
c. Design strobe light tests to examine entrainment in turbine intakes (phase one of on-site testing). |
completed |
$0 |
|
|
d. Design strobe light tests to examine entrainment in reservoir outlets (phase two of on-site testing). |
.1 |
$0 |
|
|
e. Implementation of new hydroacoustic technology. |
.2 |
$0 |
|
|
f. If strobe light testing proves suitable for implementation, then design an implementation plan for FY 2003. |
.2 |
$0 |
|
|
g. Plan research to examine the effect of strobe lights on species other than kokanee FY 2003. |
.1 |
$0 |
|
|
h. Planning and design of Clearwater Subbasin Plan with Nez Perce Tribe (FY 2000). |
.2 |
$0 |
|
|
i. If a stable kokanee population is attainable then design a predator management plan within confines of the Subbasin Plan. |
.2 |
$0 |
|
Objective | Task | Duration in FYs | Estimated 2001 cost | Subcontractor |
1. Increase the kokanee population to 30 to 50 adults/ha by reducing entrainment losses. This can be accomplished if annual survival rate for each year class of kokanee can be increased to 50%. |
a. Test split-beam hydroacoustic gear for its ability to monitoring kokanee entrainment. |
.2 |
$10,000 |
|
|
b. When available apply new technology and techniques to maximize monitoring efficiency and data interpretation. |
.2 |
$10,000 |
|
|
c. Floating dock structure will be tested during high flows for stability and to insure lights do not drift or hit trash racks. |
.1 |
$1,000 |
|
|
d. Start phase two of strobe light testing. Purchase additional strobe lights and generator, install wiring, modify exsisting research platform, and fabricate winch stantions for lifting additional lights. |
.6 |
$131,000 |
|
|
e. Two sets of lights and hydroacoustic equiptment will be installed on floating research platform in front of one intake during initial testing. |
.1 |
$3,000 |
|
|
f. Map water velocities in front of each turbine intake, reservoir outlets, and forebay. |
.1 |
$10,000 |
|
|
g. Test strobe lights in front of multiple turbine intakes or reservoir outlets. |
.4 |
$50,000 |
|
|
h. Compile hydroacoustic results and evaluate entrainment losses to compare test results. |
.1 |
$1,000 |
|
This information was not provided on the original proposals, but was generated during the review process.