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Sample Design: Tributary Habitat Assessment Grande Ronde
  • Version History: v1.0 Finalized (1/13/2022)

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.


The sample design for implementation of CRITFC's Tributary Habitat Assessment Protocol was intended to provide a spatially continuous snapshot of fish habitat conditions collected over a three year period (2021-2013) within the current extent of Spring Chinook Salmon use in the upper Grande Ronde River and Catherine Creek subbasins in NE Oregon. Site locations provided here represent the midpoint of adjoining stream segments, although field measurements will generally cover the full length of each segment. 

We delineated stream segments using the National Hydrography Dataset High Resolution flowlines (NHDPlus HR, 1:24K scale) as a starting point. Segment boundaries were based on the presence of large tributary junctions (Strahler order ≥ 4) or significant changes in valley confinement and gradient. Stream reaches falling between these break points were lumped together into a ‘segment’ and assigned a unique identification number. With a few exceptions, we used a minimum segment length of 1 km, consistent with the spacing of GRTS master sample points used by CHaMP and other programs to characterize broad-scale status and trends in fish habitat conditions. Segments were grouped by 12-digit hydrologic unit code (HUC) watershed boundaries consistent with the National Watershed Boundary Dataset (WBD) to facilitate data tracking and management.

The temporal design utilizes a simple three-panel structure in which a full census of all stream segments within each panel are sampled each year. Panel 1 (sample year 2021) represents all Tier I habitat within the upper Grande Ronde River Spring Chinook Salmon population area as designated by the Grande Ronde Atlas process (Atlas partners 2015). Additionally, some Tier II habitat was also included in this panel to evaluate specific restoration areas. Panel 2 (sample year 2022) represents all Tier I and II habitat within the Catherine Creek Spring Chinook Salmon population area. Panel 3 (sample year 2023) represents all Tier II habitat in the upper Grande Ronde Spring Chinook Salmon population area.


Atlas partners. 2015. Atlas implementation guidelines - Catherine Creek and upper Grande Ronde River. Page 17.

Start Year


End Year


Study Plan

Tributary Habitat Assessment v1.0

Data Repositories




Area of Inference

Chinook Spring-Summer Interior Columbia Pop. Name: Catherine Creek
Chinook Spring-Summer Interior Columbia Pop. Name: Grande Ronde River Upper Mainstem

AOI Notes


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


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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Relevant acts include the Organic Act, 43 U.S.C. 31 et seq., 1879; Fish and Wildlife Coordination Act, 1934; Fish and Wildlife Act, 1956; Migratory Bird Treaty Act, 1918; Migratory Bird Conservation Act, 1900; Federal Land Policy and Management Act, 1976; Fish and Wildlife Improvement Act, 1978; Endangered Species Act, 1973; Marine Mammal Protection Act, 1972; Great Lakes Fishery Act, 1956; Nonindigenous Aquatic Nuisance Prevention and Control Act, 1990; Water Resources Development Act, 1990; and other authorizations conveyed to the U.S. Geological Survey.

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