AI - Preliminary Assessment of 1996 Flood Impacts: Channel Morphology and Fish Habitat

Identification Information

Citation

Originator: Kim K. Jones, Scott Foster, Kelly M.S. Moore

Publish Date: May 1, 1998

Online Link: http://nrimp.dfw.state.or.us/crl/Reports/AI/Flood%201996%20Assessment.pdf

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Kim Jones

Job Position: Project Leader

Telephone: (541)757-4263 x260

E-Mail Address: kim.jones@oregonstate.edu

Description

Abstract: Because the Oregon Department of Fish and Wildlife (ODFW) conducted a program of quantitative stream habitat inventories from 1990-95, we have the capacity to assess channel and habitat changes. The impact area of the February 1996 event extended from the Smith River tributary in the Umpqua basin inland to the McKenzie basin and north to include the remainder of Oregon’s coast range tributaries, the Willamette Valley, and west slope of the Cascades. High precipitation and storm flows also occurred in the Hood River, Deschutes, Grande Ronde and Wallowa basins. Within this area, ODFW’s Aquatic Inventory Project (AIP) has conducted stream surveys and summarized data for over 650 stream with approximately 3,800 km of stream length covered. Because of the extensive habitat information collected and analyzed by the project, we had the ability to select stream reaches for resampling, stratified by ecoregion and geology, land use, and channel gradient. Also, because the AIP program has developed many partnerships among state, county, federal, and private landowners, the assessment was able to address the flood effects across a broad range of geographic and land use criteria. The sampling design was structured to allow analysis of the stream survey results to address the following questions: • What is the degree and extent of habitat alteration associated with the floods? • How did flood impacts on stream habitat vary by region, land use, and stream channel characteristics? • What were the characteristics of stream reaches that demonstrated positive or negative habitat responses to the flooding? • What land use and management practices were associated with positive or negative impacts on stream habitat? • Were there different impacts relative to the habitat requirements of the different salmon species? In other words, were there net gains for coho habitat but net losses for chinook? • Based on the observations and results of this study, what options are available for improved habitat management in streams influenced by the floods?

Purpose:

Time Period of Content: 1996

Geographic Extent: Tillamook, Nestucca, Siletz, McKenzie, Santiam, Upper Willamette, Nehalem, Necanicum, Yaquina, Alsea, Siuslaw, Hood River, Lower Deschutes, Grande Ronde, Wallowa Basins

Status: Final

Use Constraints:

Format: PDF File

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Is a physical copy maintained for reference at Headquarters? No