Montana Fish, Wildlife & Parks 2002 Westslope2002Assessment.zipPortland, OregonMontana Fish, Wildlife & Parks, via the StreamNet Data Publishing Servicehttp://www.streamnet.org/online-data/ids.cfm?id=36&keywords=Shepard, B.B, B.E. May, W. Urie, C. Corsi, K. McDonald, R. Snyder, T. Unterwegner, J. Uehara, and K. Walker. 2003. Status of westslope cutthroat trout (Oncorhynchus clarki lewisi) in the United States: 2002. The distribution and abundance of westslope cutthroat trout (Oncorhynchus clarki lewisi; WCT) have declined from historical levels over part or all of their historical range. For the U.S. range of WCT we used existing information provided by 112 fisheries professionals applied through a consistent methodology to assess the extent of WCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 539 populations designated as conservation populations by management agencies. We estimated that WCT historically occupied about 56,500 miles of habitat within the U.S. WCT currently occupy an estimated 33,500 miles of historically occupied habitats (59%). Genetic testing has been completed across about 6,100 miles of habitat (18% of occupied habitats), but sample sizes were variable and sample sizes of 25 fish or more (a sample size that likely would detect as little as 1% levels of introgression with a 95% level of confidence) made up 30% of the samples. WCT with no evidence of genetic introgression currently occupied about 3,400 miles (10%) of currently occupied habitats. Another 1,000 miles of currently occupied habitats (3%) contained WCT that were probably part of a mixed stock where the WCT were not introgressed. We suggest that even though genetic sampling was nonrandom because sampling likely occurred more frequently in WCT populations that appeared non-introgressed, some, if not much, of the habitats currently occupied by WCT where no genetic testing has been done likely support populations that are not introgressed. Much of the habitat currently occupied by WCT was located in designated parks (2%), wilderness areas (19%), and roadless areas (40%), and almost 70% of habitats currently occupied lie within federally managed lands. A total of 563 separate WCT populations currently occupying 24,450 miles of habitat were designated as conservation populations. These conservation populations were spread throughout the historical range, occuring in 67 of the 70 hydrologic units historically occupied by WCT. Most of these conservation populations were believed to be .isolets. (457 or 81%); however, metapopulations occupied much more of the habitat (21,600 miles or 88%). Of the 563 designated conservation populations, 339 (60%) had at least some component that was genetically unaltered and 172 (30%) consisted entirely of stream segments that were genetically unaltered. For the 539 conservation populations for which risks to the population were asseessed, more isolet populations were at higher risks due to temporal variability, population size, and isolation than metapopulations, but these isolets were generally at less risk from genetic and disease factors than metapopulations. This assessment clearly shows that WCT currently occupy significant portions of, and are well distributed across, their historical range. The data suggest that genetically unaltered WCT occupy at least 13% and possibly up to 35% of currently occupied habitats (8 to 20% of historical habitats). Conservation population designations suggest that two different conservation management strategies are needed and being implemented to conserve WCT. One strategy concentrates on preventing introgression, disease and competition risks through isolation of WCT, while the other concentrates on preserving metapopulation function and multiple life- history strategies by connecting occupied habitats. EnglishTaxa: Westslope cutthroat trout (Oncorhynchus lewisii clarki) Agencies Involved: Montana Fish, Wildlife & Parks (MFWP) Montana Cooperative Fishery Research Unit USDA Forest Service (USFS) Idaho Department of Fish and Game (IDFG) Oregon Department of Fish and Wildlife (ODFW) Washington Department of Fish and Wildlife (WDFW) StreamNet is a cooperative information management and dissemination project focused on fisheries and aquatic related data in the Columbia River basin and the Pacific Northwest. The project provides a variety of data related to fish resources and maintains the 1:100,000 scale hydrography layer for the Pacific Northwest. Information is available through an on-line database query, interactive maps, direct data download or by custom request. StreamNet receives funding from the Bonneville Power Administration (BPA Project No.: 198810804) and is authorized under the Fish and Wildlife Program of the Northwest Power and Conservation Council. Other organizations provide funding for select project components. Participating agencies contribute significant in-kind services and include: the Oregon Dept. of Fish and Wildlife (ODFW), Washington Dept. of Fish and Wildlife (WDFW), Idaho Dept. of Fish and Game (IDFG), Montana Fish, Wildlife and Parks (MFWP), U.S. Fish and Wildlife Service (USFWS), and the Columbia River Inter-Tribal Fisheries Commission (CRITFC). In addition to the data sets that StreamNet develops and maintains in the central database, StreamNet also provides a service called the "StreamNet Data Store" (http://www.streamnet.org/online-data/datastore.html). The Data Store warehouses data separate from StreamNet's central integrated database, most of which are developed by people outside of the StreamNet project. The data set described here is available from the StreamNet Data Store.For the U.S. range of WCT we used existing information provided by 112 fisheries professionals applied through a consistent methodology to assess the extent of WCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 539 populations designated as conservation populations by management agencies. 2002 publication date Unknown Unknown -121.126 -111.091 49.007 42.525 biotageneticsintrogressionmileshistoricaldistributionbarriersrisksland managementimpactsrangeCurrent distributionAbundanceenvironmentinlandWatersColumbia basinBlue Mountain: AsotinBlue Mountain: Grande RondeBlue Mountain: ImnahaBlue Mountain: Snake Hells CanyonColumbia Cascade: Lake ChelanColumbia Cascade: MethowColumbia Plateau: John DayColumbia Plateau: PalouseColumbia Plateau: Snake lowerIntermountain: Coeur D'AleneIntermountain: Pend OreilleIntermountain: SpokaneMiddle Snake: Snake lower middleMountain Columbia: BitterrootMountain Columbia: BlackfootMountain Columbia: Clark ForkMountain Columbia: FlatheadMountain Columbia: KootenaiMountain Snake: ClearwaterMountain Snake: SalmonMontanaIdahoWyomingWashingtonOregonPacific Northwest None Fish and Wildlife Data Manager mailing and physical address Helena MT 59620 Unites States

Montana Fish, Wildlife & Parks, Fisheries Division

1420 E. Sixth Avenue

stcarson@state.mt.us Steve CarsonMontana Fish, Wildlife & Parks, Fisheries Division406-444-7778 Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332 Portland, ORStreamNet Project, Pacific States Marine Fisheries Commission StreamNet 2000 map This is the base hydrography used to map these events. http://www.streamnet.org/pnwr/pnwrhome.html Adobe Portable Document Format (.pdf); Hypertext markup language (.html); Microsoft Access (.mdb); ESRI shape file (.shp, .shx, .dbf); Microsoft Word (.doc) complete data set StreamNet project, Pacific States Marine Fisheries Commission Unpublished Material Online interface The distribution and abundance of westslope cutthroat trout (Oncorhynchus clarki lewisi; WCT) have declined from historical levels over part or all of their historical range. For the U.S. range of WCT we used existing information provided by 112 fisheries professionals applied through a consistent methodology to assess the extent of WCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 539 populations designated as conservation populations by management agencies. Pacific States Marine Fisheries Commission StreamNet Regional GIS Specialist StreamNet Regional GIS Specialist mailing and physical address

205 SE Spokane Street, Suite 100

Portland OR 97202 (503) 595-3100 (503) 595-3232 StreamNetGIS@psmfc.org 9:00 AM - 5:00 PM Tabular data (such as in spreadsheets); Reports / publications; Spatial data (shape files, GIS coverages, or geodatabase) winzip 43.3 none Send request to contact IndefinitelyDownloadable data 20070309 Pacific States Marine Fisheries Commission StreamNet Regional GIS Specialist StreamNet Regional GIS Specialist mailing and physical address

205 SE Spokane Street, Suite 100

Portland OR 97202 (503) 595-3100 (503) 595-3232 StreamNetGIS@psmfc.org 9:00 AM - 5:00 PM FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time none none EnglishUnclassifiedhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile 20070309112556002007030615100600FALSE2007010814392600Published{D4753878-4CC5-44A6-A854-59049A1FCD77}{8022C07F-0542-4FA5-87B8-6F795EED2336}20070309Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332HydroUnit_PNAMP_HUC5935853.8274244918642.99572964357.319859-1046015.4344141-125.584325-109.01666149.13565937.8896791ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\HONU\GIS\GIS_Projects\073_METADATA_Adam\SN_DATA_STORE\DS40_WESTSL_CT_02_ASSESSLocal Area NetworkPersonal GeoDatabase Feature ClassNAD_1927_Lambert_Conformal_Conic2396{3F3BC35C-1DB9-4043-BEA3-623DA58B7C12}