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Sample Design: Monitoring Steelhead Use of Restoration Projects – Redd and Juvenile Snorkel Survey Design
  • Version History: v1.0 Finalized (5/20/2025)
Basics

The details of this Sample Design, including all the parameters used to generate it, are included below. Sample designs must belong to a Study Plan.

Description

Spatial Design:
This sample design includes stream reaches identified for steelhead redd surveys in the North Fork Walla Walla River and Couse Creek. All reaches are on private lands with secured access and were selected to align with habitat restoration treatments or serve as adjacent non-treatment comparison areas. The spatial design includes:

North Fork Walla Walla River:

RM 3.6-4.4 (braided complex restoration 2023)

RM 4.4-5.2 (restoration 2024)

RM 5.2-6.5 (planned restoration reach 2026)

RM 6.5-7.7 (planned restoration reach 2027)

RM 7.7-8.8 (planned restoration reach 2028)

Couse Creek:

RM 0–0.25 (confluence roughened riffle project, 2021)

RM 3.2–4.5 (low-tech restoration 2023 and 2024, and adjacent reach)

RM 7.0–9.4 (planned future restoration reach, 2025-2027)

These reaches represent the accessible project areas in the two tributaries and include both restored and unrestored sites for spatial comparison of redd and juvenile abundance and distribution.

Temporal Design:

  • All surveys will be conducted in 2025 and 2026
  • Redd surveys will be conducted in each reach at least four times per spawning season, spaced no more than 14 days apart between February and May. Survey timing is based on CTUIR fish counts at Nursery Bridge Dam and stream temperature conditions to capture the full steelhead spawning period. Data will be collected and analyzed annually.
  • Stream Habitat Surveys will occur annually prior to snorkel surveys.
  • Juvenile Snorkel Surveys will be conducted once per year per reach, from May through July, depending on hydrology and water temperature. Couse Creek surveys will take place in May–June (depending on reach type), and North Fork surveys in late June to early July, before peak summer temperatures. Surveys will only be conducted when stream temperatures are within the recommended 14–18°C range for optimal visibility and fish detectability (White et al. 2012; O'Neal 2007).

Start Year

2025

End Year

2026

Study Plan

Monitoring Steelhead Use of Restoration Projects in the North Fork Walla Walla River and Couse Creek v1.0

Data Repositories

Focal Species

Photos

Documents

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Area of Inference

HUC6 - Sub Watershed: Couse Creek
HUC6 - Sub Watershed: North Fork Walla Walla River

AOI Notes

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Sample Sites
These are the unique sites that are participating in this sample design over the time period covered by the design.

Map of Sites

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Sampling Schedule
This section describes which sites are scheduled to be sampled in any given year, and (if applicable) the panel and stratum that the sample site belongs to.

Plan Description

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