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, and we will also be removing hatchery steelhead at our traps when it appears that there will be over 5% hatchery fish on the spawning grounds. 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 2010-026-00 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 2002-053-00) or Tucannon steelhead populations (New Fast Track Project 2010-034-00 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.  The designated Tucannon and Asotin steelhead populations extend beyond those drainages or areas sampled by the projects listed above.  Therefore, the intent of this project is to collect new adult return information on these small tributaries to add to the Asotin and Tucannon monitoring projects and enable us to estimate total population abundance.  Adult traps have proven to be more effective at estimating adult returns than steelhead spawning surveys (e.g. Asotin Creek).
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* Expenditures data includes accruals and are based on data through 31-Oct-2019.

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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
Compliance for WEs C-L B: 165. Compliance for WEs C-J 02/29/2012 02/29/2012
Upstream migrant traps for adult steelhead acquired, installed, and removed at end of season C: 70. Acquire and install traps and weirs 07/01/2012 07/01/2012
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 06/30/2012 06/30/2012
Adult enumeration data E: 157. Adult enumeration 11/30/2012 11/30/2012
Genetic sampling data F: 157. Collect Tissue Samples for Baseline Genetic Analysis 07/01/2012 07/01/2012
Water temperature summaries H: 157. Deploy, monitor, and retrieve water temperature monitors 06/30/2012 06/30/2012
Flow monitoring data I: 157. Monitor stream discharges 11/30/2012 11/30/2012
Analyzed Spawning Data J: 162. Analyze Steelhead Spawning Data 11/30/2012 11/30/2012
Analyzed Adult Trapping Data K: 162. Analyze Adult Trap Data 11/30/2012 11/30/2012
Manage Project 2010-028-00 L: 119. Manage & Administer Project 11/30/2012 11/30/2012

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
  • 2 instances of WE 162 Analyze/Interpret Data

Sort WE ID WE Title NEPA NOAA USFWS NHPA Has Provisions Inadvertent Discovery Completed
A 185 Periodic Status Reports for BPA 12/01/2011
B 165 Compliance for WEs C-J 12/01/2011
C 70 Acquire and install traps and weirs 12/01/2011
D 158 Operculum punch or tag steelhead passed upstream for mark-recapture estimate of trap efficiency 12/01/2011
E 157 Adult enumeration 12/01/2011
F 157 Collect Tissue Samples for Baseline Genetic Analysis 12/01/2011
G 157 Steelhead redd count surveys 12/01/2011
H 157 Deploy, monitor, and retrieve water temperature monitors 12/01/2011
I 157 Monitor stream discharges 12/01/2011
J 162 Analyze Steelhead Spawning Data 12/01/2011
K 162 Analyze Adult Trap Data 12/01/2011
L 119 Manage & Administer Project 12/01/2011
M 132 Technical Progress Report 12/01/2011