Draft Imnaha Subbasin Summary November 30, 2001 Prepared for the Northwest Power Planning Council Subbasin Team Leader



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Watershed Assessment

Watershed assessments completed for the Imnaha subbasin characterize historical conditions, current habitat, analysis, improvement recommendations, propagation, policies, and management planning. Some reports also cover public involvement and agency interactions with regard to implementation of management plans. The following list is not meant to be inclusive of all documents that have been produced for the Imnaha Subbasin but it is meant to be representative.

Duncan, D. and G. Cawthon (1994). Draft Grande Ronde Model Watershed Program Operations- Action Plan. La Grande, OR.

Provides an overview of current watershed and fish habitat conditions, describes the Grande Ronde Model Watershed Program, delineates a framework for subbasin needs, describes potential measures as current, proposed, or under consideration. Includes Imnaha River as part of the Grande Ronde watershed.

Gaumer, T. F. (1968). Behavior of Juvenile Anadromous Salmonids in the Imnaha River, September 1964 - June 1967. Fish Commission of Oregon; Nez Perce Tribe.

Covers timing of migration, distribution of adult anadromous fish, rearing areas of juvenile anadromous fish, and resident fish.

Huntington, C. W. (1994). Stream and Riparian Conditions in the Grande Ronde Basin 1993. Canby, OR: Clearwater BioStudies, Inc.

This report contains information prepared for the Grande Ronde Model Watershed Board to aid in the development of a watershed restoration program for the Grande Ronde Basin in Oregon and Washington.

Johnson Jr., C.G. and S.A. Simon. (1887). Plant associations of the Wallowa-Snake Province.

This assessment was conducted in response to the proposed construction of High Mountain Sheep Dam on the Snake River below the Imnaha confluence.

Mays, D. (1992). Imnaha River Stream Survey Report.

This report is part of the Wallow-Whitman National Forest Stream Survey Program, initiated in 1989 to inventory existing fisheries conditions and provide baseline information for wild and scenic river planning. The stream survey was collected according to USFS Region Six Version Five methodology based on Hankin and Reeves (1988) riparian vegetation data, stream management and analysis, and reporting and tracking system. Foxpro was used to analyze the stream habitat data. The survey found the condition in 1992 to be good to excellent and meeting forest plan standards and goals. Grazing, power line right of ways, and home developments have impacted a number of reaches in the watershed. Temperatures probably always exceeded 68˚F in warm seasons.

Mays, D. (1992). Lick Creek Stream Survey Report.

Reported on results from R-6 Hankin/Reeves Stream Inventory Methodology (ver. 4.0). They found the subwatershed to be generally in good condition

Mays, D. (1992). North Fork Gumboot Creek Stream Survey Report.

Reported on results from R-6 Hankin/Reeves Stream Inventory Methodology (ver. 4.0). They found the subwatershed to be in good condition with some livestock issues in the East N. Fork and some channelization at the confluence with Gumboot Creek.

Mobrand, L. and L. Lestelle (1997). Application of the Ecosystem Diagnosis and Treatment Method to the Grande Ronde Model Watershed Project. Portland: Prepared for Bonneville Power Administration.

An assessment of the ability of the watershed to support and sustain natural resources and other economic and societal values. Helps guide the development of actions aimed at improving the conditions of the watershed to achieve long-term objectives.

Mundy, P. R. and K. Witty (1998). Imnaha Fisheries Management Plan: Documentation for Managing Production and Broodstock of Salmon and Steelhead. Fisheries and Aquatic Sciences; S. P. Cramer and Associates.

Prepared at the request of the Nez Perce Tribe as a record and guide for its fisheries management and mode of communication with its co-manager ODFW. Focus is on the basis for production of salmon and steelhead and managing allocation of spawners to hatchery broodstock and natural spawning. Includes relevant policies, objectives, recommendations, and understandings.

Nez Perce Tribe, Confederated Tribes of the Umatilla Indian Reservation, et al. (1990). Imnaha River Subbasin Salmon and Steelhead Production Plan.

This plan is one of the 31 subbasin long-term plans that comprise the NPPC's Columbia River Basin Fish and Wildlife Program for salmon and steelhead production. In addition to providing the basis for production strategies, it also documents current and potential production, summarizes agency and tribal management efforts, goals, and objectives, and identifies problems, opportunities, and strategies.

Nowakowski, M. J. (1978). Soil Depth and Elevation as a Basis for Predicting Three Steppe Habitat Types of Wallowa County, Oregon.

MS Thesis which examines three steppe habitat types by measuring aspect, slope, elevation and soil depth, and vegetation coverage, frequency and productivity. Soil depth and elevation were the best variables for distinguishing habitat types.

Parkhurst, Z. E. (1950). Survey of the Columbia River and its Tributaries, Part VII: Snake River from above the Grande Ronde River through the Payette River.

Rose, R. K., G. Sausen and K. Martin (1992). Imnaha River Drainage: Assessment of Ongoing Management Activities. Wallowa-Whitman National Forest.

Covers timber sales, silviculture, recreation, engineering, and range.

Sausen, G. (1997). Imnaha River and Sheep Creek Section 7 Watersheds: Assessment of Ongoing and Proposed Activities. Amendment to Include Proposed Project, Marr Flat Grazing Allotment. Wallowa-Whitman National Forest.

Classifies streams and determines conditions to help prioritize areas of resource concern within the designated area. Includes description of site-specific recommended activities.

Watershed improvements since 1990 include adding large woody material into headwater intermittent and ephemeral draws and constructing exclosures to reduce impacts to headwater seeps and springs from ungulates.

Thompson, Robert N., and James B. Haas. 1960. Environmental Survey Report Pertaining to Salmon and Steelhead in Certain Rivers of Eastern Oregon and the Willamette River and its Tributaries. Part I. Surveys of Eastern Oregon Rivers.

Thompson and Haas surveyed watersheds in the Imnaha Subbasin for habitat condition, quantity, and quality for salmon and steelhead. They also reviewed potential hatchery sites.

USDA Forest Service, J. (1994). Sheep Creek Section 7 Watershed: Assessment of Ongoing and Proposed Activities. Wallowa-Whitman National Forest.

USDA Forest Service, J. (1998a). Steelhead Consultation for Big Sheep Creek Section 7 Watershed: Assessment of Ongoing and Proposed Activities. Wallowa-Whitman National Forest.

USDA Forest Service, J. (1998b). Steelhead Consultation for Imnaha River Section 7 Watershed: Assessment of Ongoing and Proposed Activities. Wallowa-Whitman National Forest.

USDA Forest Service, J. and R. B. Mason (2000). Bull Trout Consultation for Imnaha River Section 7 Watershed: Assessment of Ongoing and Proposed Activities. Wallowa-Whitman National Forest.

USDA Forest Service (2001). Imnaha Subbasin Multi-Species Biological Assessment (2000-2001: Assessment of ongoing and proposed activities. Wallowa-Whitman National Forest. Eagle Cap Ranger District, Hells Canyon Ranger District, Wallowa Valley Ranger District, Pine Ranger District.

Wallowa County and Nez Perce Tribe (1993, updated and expanded in 1999). Salmon Habitat Recovery Plan with Multi-Species Habitat Strategy. Assures that watershed conditions in Wallowa County provide habitat necessary for salmonids and other vertebrate species by protecting and enhancing conditions as needed. Analyzes the Imnaha River for water quantity, water quality, stream structure, substrate, and habitat requirements. Appendices include social and economic infrastructure, agriculture history, logging, mining, and vegetation.

Wallowa-Whitman National Forest (1995). Big Sheep Creek Watershed Analysis.

Includes erosion characterization, erosion processes, stream channel, hydrology, water quality, vegetation, species and habitat, human uses, and national forest management practices.

Wallowa-Whitman National Forest (1998). Upper Imnaha River and Lower Imnaha River Watershed Analysis.

Includes erosion characterization, erosion processes, stream channel, hydrology, water quality, vegetation, species and habitat, human uses, and national forest management practices.







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