Abundance/ Productivity Risk Very Low (<1%) HV HV V M Low (1-5%) V V V M Moderate (6 – 25%) M M M HR High (>25%) HR HR HR HR Figure 4.1.1– . summer steelhead population risk ratings integrated across the four viable salmonid population (VSP) metrics. Viability Key: HV – Highly Viable; V – Viable; M – Maintained; HR – High Risk; Shaded cells – does not meet viability criteria (darkest cells are at greatest risk).
Table 4.2.1– . summer steelhead population spatial structure and diversity risk rating summary. Metric Risk Assessment Scores Metric Factor Mechanism Goal Population A.1.a L (1) L (1) Low Risk (Mean = 1.33) Low Risk (Mean = 1.33) Low Risk A.1.b L (1) L (1) A.1.c VL (2) VL (2) B.1.a L (1) L (1) Low Risk (1) Low Risk (Mean = 0.75) B.1.b L (1) L (1) B.1.c VL (2) VL (2) B.2.a(1) VL (2) M (0) Moderate Risk (0) B.2.a(2) M (0) B.2.a(3) VL (2) B.2.a(4) VL (2) B.3.a L (1) L (1) L (1) B.4.a L (1) L (1) L (1) Overall Viability Rating We are unable to assign an overall viability rating with any degree of confidence because there are no population-specific abundance and productivity data. Given the Low Risk rating for spatial structure and diversity and the assumption that this population has similar abundance and productivity as other subbasin steelhead populations, then this population would be rated as VIABLE or MAINTAINED. Spatial Structure/Diversity Risk Very Low Low Moderate High Abundance/ Productivity Risk Very Low (<1%) HV HV V M Low (1-5%) V V ? V M Moderate (6 – 25%) M M ? M HR
SRSRB ( Salmon Recovery Board). 2006. Technical Document: Snake River Salmon Recovery Plan for . Prepared for the Washington Governor’s Salmon Recovery Office. . Available: versus , Technical Advisory Committee (TAC). 2002. Current Status Summary – Imnaha River Summer Steelhead MPG The Imnaha River steelhead population was assigned as a single population MPG by the ICTRT based primarily on comparisons of samples of within-basin genetic diversity levels versus samples from Grande Ronde, Clearwater and Salmon River populations (Figure 4.3–1). The following tables summarize the results of the population level assessment for Imnaha River steelhead. Estimates of annual spawning abundance are not available for this population. Year to year trends and patterns in the Camp Creek index area are similar to other Snake River steelhead populations (Figure 4.3–3). Table 4.3– . Viability assessments for DPS steelhead population in the Imnaha River MPG (Camp Creek index area). There are insufficient data for this population to determine steelhead abundance and productivity. Data have not been expanded from index area to entire population since Camp Creek only represents a small portion of the spawning area. Population Level: Abundance and Productivity Population Level: Spatial Structure and Diversity Population Overall Viability Rating Abundance Productivity Overall A/P Goal A Goal B Overall SS/D Population Extant/ Extinct Current Natural Abundance Minimum Threshold Current Estimate (R/S) Minimum R/S @ threshold Integrated A/P Risk Natural Processes Risk Diversity Risk Integrated SS/D Risk * Extant Unknown 1,000 1.51 1.15 Moderate Very Low Moderate Moderate MAINTAINED *: Camp Creek index area Spatial Structure/Diversity Risk Very Low Low Moderate High Abundance/ Productivity Risk Very Low (<1%) HV HV V M Low (1-5%) V V V M