Columbia Basin Fish and Wildlife Program Columbia Basin Fish and Wildlife Program
SOW Report
Project Number:
Estimate Adult Steelhead Abundance in Small Streams Associated with Tucannon & Asotin Populations
Province Subbasin %
Columbia Plateau Snake Lower 100.00%
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Contract Description:
Asotin and Tucannon steelhead are sole populations within the Lower Snake River Major Population Group (MPG). Both populations include steelhead using small Snake River tributaries that have little or no fish monitoring. All but one of the tributaries (Alpowa Creek) are considered minor spawning aggregations (mSAs) and most of these mSAs are not monitored for adult steelhead abundance or other Viable Salmonid Population (VSP) attributes. Therefore, the proportions of adult natural origin steelhead escapement, or hatchery fish on the spawning grounds, within these mSAs, are unknown for these two steelhead populations (Asotin and Tucannon). NOAA guidance on monitoring ESA recovery (Crawford and Rumsey 2009) lists abundance of naturally produced steelhead as the highest priority for monitoring. They also call for monitoring the ratio of marked to unmarked fish in spawning escapement. The Tucannon and Lower Snake Subbasin Plans, and the Snake River Salmon Recovery Plan also emphasize improved monitoring, especially for adult escapements.

We propose to establish upstream migrant traps on at least two mSA tributaries per year, and rotate them from stream to stream every three years, to: 1) estimate adult steelhead abundance and ratios of hatchery and natural steelhead, 2) collect tissue samples for inclusion in Snake Basin genetic characterization of steelhead (coordinated with New Fast track proposal 202002600 from IDFG) for future run reconstruction estimates at Lower Granite Dam, 3) geographically locate and reference (gps) all redds while conducting spawning surveys in at least one stream to compare the abundance estimate with the trap estimate, and 4) conduct random draws of the data to test and evaluate several different spawning survey designs and determine their precision and accuracy.

Natural adult abundance, and the proportion of hatchery steelhead, in the associated mSA tributaries will be compiled with similar estimates for core Asotin (on-going BPA Project 00205300) or Tucannon steelhead populations (New Fast Track Project 201003400 and Lower Snake River Compensation Plan monitoring by WDFW) to provide more complete estimates of adult abundance and escapement composition (e.g. hatchery proportion and source) over a period of years.
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* Expenditures data includes accruals and are based on data through 31-Oct-2019.

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Contract (IGC)
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Cost Reimbursement (CNF)
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Viewing of Work Statement Elements

Deliverable Title WSE Sort Letter, Number, Title Start End Complete
Compliance for WEs C-L A: 165. Compliance for WEs C-J 06/30/2011 06/30/2011
Upstream migrant traps for adult steelhead acquired, installed, and removed at end of season C: 70. Acquire and install traps and weirs 07/01/2011 05/17/2011
Mark or tag adult steelhead at traps for mark-recapture estimates D: 158. Operculum punch or tag steelhead passed upstream for mark-recapture estimate of trap efficiency 06/30/2011 05/17/2011
Adult enumeration data E: 157. Adult enumeration 11/30/2011 11/30/2011
Genetic sampling data F: 157. Collect Tissue Samples for Baseline Genetic Analysis 07/01/2011 05/17/2011
Water temperature summaries H: 157. Deploy, monitor and retrieve water temperature monitors 11/30/2011 11/30/2011
Flow monitoring data I: 157. Monitor stream discharges 11/30/2011 11/30/2011
Analyzed data J: 162. Analyze data 11/30/2011 11/30/2011
Manage Project 2010-028-00 K: 119. Manage & Administer Project 11/30/2011 11/30/2011

Viewing of Implementation Metrics
Viewing of Environmental Metrics

Primary Focal Species Work Statement Elements
Steelhead (O. mykiss) - Snake River DPS (Threatened)
  • 1 instance of WE 70 Install Fish Monitoring Equipment
  • 5 instances of WE 157 Collect/Generate/Validate Field and Lab Data
  • 1 instance of WE 158 Mark/Tag Animals
  • 1 instance of WE 162 Analyze/Interpret Data

Sort WE ID WE Title NEPA NOAA USFWS NHPA Has Provisions Inadvertent Discovery Completed
A 165 Compliance for WEs C-J 08/01/2010
B 185 Periodic Status Reports for BPA 08/01/2010
C 70 Acquire and install traps and weirs 10/07/2010
D 158 Operculum punch or tag steelhead passed upstream for mark-recapture estimate of trap efficiency 04/22/2011
E 157 Adult enumeration 04/22/2011
F 157 Collect Tissue Samples for Baseline Genetic Analysis 04/22/2011
G 157 Steelhead redd count surveys 08/01/2010
H 157 Deploy, monitor and retrieve water temperature monitors 08/01/2010
I 157 Monitor stream discharges 08/01/2010
J 162 Analyze data 08/01/2010
K 119 Manage & Administer Project 08/01/2010
L 132 Technical Progress Report for 8/1/10 - 11/30/11 due under next contract 08/01/2010