Columbia Basin Fish and Wildlife Program Columbia Basin Fish and Wildlife Program
SOW Report
Contract 71840: 2007-003-00 EXP DWORSHAK DAM RESIDENT FISH MITIGATION
Project Number:
Title:
Dworshak Dam Resident Fish Mitigation
BPA PM:
Stage:
Closed
Area:
Province Subbasin %
Mountain Snake Clearwater 100.00%
Contract Number:
71840
Contract Title:
2007-003-00 EXP DWORSHAK DAM RESIDENT FISH MITIGATION
Contract Continuation:
Previous: Next:
68053: 2007-003-00 EXP DWORSHAK DAM RESIDENT FISH MITIGATION
  • 75428: 2007-003-00 EXP DWORSHAK DAM RESIDENT FISH MITIGATION
Contract Status:
History
Contract Description:
Contract Description:

This contracting period represents the fifth year of a second nutrient restoration pilot study on Dworshak Reservoir.  This project is a joint venture between the U.S. Army Corps of Engineers (USACE) and the Idaho Department of Fish and Game (IDFG).  The USACE will apply ammonium nitrate to the reservoir to promote an improved nitrogen to phosphorus ratio and increased food web efficiency.  The IDFG will be responsible for collecting limnological samples, which will be used for in-season management of nutrient supplementation and for evaluating project effectiveness.  The USACE has contracted Advanced Eco-Solutions to provide the nutrient prescription, interpret the results of limnological sampling, and recommend in-season adjustments to the amount of fertilizer to be applied.  Fish monitoring will also be conducted by the IDFG and, combined with limnological data, will allow for an overall assessment of project effectiveness.

This project was initially designed to be a five year pilot study to determine if nutrient restoration would work as a long-term management strategy for Dworshak Reservoir.  However, the original pilot study was interrupted by a legal challenge less than four years into the project.  Many of the benefits of nutrient restoration are believed to be cumulative, working up successive trophic levels each year.  Therefore, it was determined that an additional pilot study of five consecutive years should be conducted in order to properly assess the effects of nutrient restoration.  Furthermore, this scenario has unintentionally resulted in a unique opportunity to evaluate a nutrient restoration project using an interrupted time series study design.  From this, we can track changes to the limnological conditions and productivity of the reservoir in response to adding nutrients for a period of time, discontinuing the additions, and then continuing them again.

The first four years of nutrient restoration produced promising results.  Nitrogen additions resulted in immediate increases of picoplankton densities. By the second year, we observed increases in the proportion of edible plankton concurrent with decreases in the proportion of inedible phytoplankton.  Furthermore, the percentage of the phytoplankton community that was composed of toxigenic cyanobacteria (blue-green algae) was significantly less than non-restoration years by the second year of the project.  Zooplankton densities were also higher by the fourth year of the project than they had been in recent years.  Daphnia biomass and densities were higher during the restoration period than the non-restoration period.  Daphnia were also larger in three out of four restoration years than in pre-restoration years.  Kokanee were larger by the fourth year of the project than in a pre-restoration year of similar density and biomass was at least double that of recent years.  These results were achieved without violating water quality standards set forth in the Consent Order.

Both limnological and fish sampling during this contracting period will be similar to the last contracting period.  We will continue to collect creel data, but at a reduced level due to the available funding.  While we are beginning to get a good understanding of how each trophic level is responding, we need more data to determine how the fishery has benefited.
Account Type(s):
Expense
Contract Start Date:
03/01/2016
Contract End Date:
02/28/2017
Current Contract Value:
$216,257
Expenditures:
$216,257

* Expenditures data includes accruals and are based on data through 31-Jan-2021.

BPA CO:
Env. Compliance Lead:
Work Order Task(s):
Contract Type:
Contract (IGC)
Pricing Method:
Cost Reimbursement (CNF)
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Viewing of Work Statement Elements

Deliverable Title WSE Sort Letter, Number, Title Start End Complete
All administrative tasks fulfilled with timely quality products A: 119. Manage and Administer Project 02/28/2017
BPA Environmental Compliance B: 165. Environmental Compliance 12/31/2016 01/04/2017
Collect reservoir limnological data C: 157. Collect reservoir limnological data 01/31/2017 02/13/2017
Provide data summaries and interpretation D: 162. Analyze and interpret limnological data 02/28/2017 02/13/2017
Collect kokanee population data E: 157. Conduct Kokanee population surveys 01/15/2017 02/13/2017
Provide data summaries and interpretation F: 162. Analyze and interpret Kokanee population data 02/28/2017 02/13/2017
Survey spawning kokanee G: 157. Survey Kokanee spawners 01/15/2017 02/13/2017
Provide data summaries and interpretation H: 162. Analyze and interpret Kokanee spawner data 02/28/2017 02/13/2017
Conduct creel surveys I: 157. Conduct creel surveys to evaluate the fishery 12/31/2016
Provide data summaries and interpretation J: 162. Analyze and interpret creel data 02/28/2017
Present project results and findings K: 161. Present project results and findings 02/28/2017 02/21/2017
Manage project data L: 160. Manage project data 01/15/2017 01/13/2017
Maintain public support for project M: 99. Maintain public support for project 02/28/2017 02/28/2017
Completed Annual Report N: 132. Submit Progress Report for the period Mar 2016 to Feb 2017 02/28/2017 02/28/2017

Viewing of Implementation Metrics
Viewing of Environmental Metrics Customize

Primary Focal Species Work Statement Elements
Kokanee (Oncorhynchus nerka)
  • 4 instances of WE 157 Collect/Generate/Validate Field and Lab Data
  • 1 instance of WE 161 Disseminate Raw/Summary Data and Results
  • 4 instances of WE 162 Analyze/Interpret Data

Sort WE ID WE Title NEPA NOAA USFWS NHPA Has Provisions Inadvertent Discovery Completed
A 119 Manage and Administer Project 03/01/2016
B 165 Environmental Compliance 03/01/2016
C 157 Collect reservoir limnological data 03/01/2016
D 162 Analyze and interpret limnological data 03/01/2016
E 157 Conduct Kokanee population surveys 03/01/2016
F 162 Analyze and interpret Kokanee population data 03/01/2016
G 157 Survey Kokanee spawners 03/01/2016
H 162 Analyze and interpret Kokanee spawner data 03/01/2016
I 157 Conduct creel surveys to evaluate the fishery 03/01/2016
J 162 Analyze and interpret creel data 03/01/2016
K 161 Present project results and findings 03/01/2016
L 160 Manage project data 03/01/2016
M 99 Maintain public support for project 03/01/2016
N 132 Submit Progress Report for the period Mar 2016 to Feb 2017 03/01/2016
O 185 Periodic Status Reports for BPA 03/01/2016