Phase 1 Habitat Assessments

Transcription

1 Phase 1 Habitat Assessments CONOR GIORGI ANADROMOUS PROGRAM MANAGER, SPOKANE TRIBE CASEY BALDWIN SENIOR RESEARCH SCIENTIST, COLVILLE CONFEDERATED TRIBES CONTRIBUTIONS FROM: CCT, CDAT, STI, UCUT, & WDFW LAKE ROOSEVELT FORUM APRIL 25, 2018

2 Habitat Assessments Outline Investigate habitat availability, suitability and salmon survival potential in habitats above Grand Coulee Tributary Habitats 1. Intrinsic Potential 2. Ecosystem Diagnosis & Treatment 3. Sanpoil Sockeye Large River Habitats 4. Rufus Woods 5. Transboundary Reach Reservoir Rearing 6. Sockeye Smolt Capacity

3 Intrinsic Potential (IP) - STI Availability of tributary habitats? NOAA s Northwest Fisheries Science Center - Technical Assistance Spawning and rearing habitats for spring Chinook and steelhead Geographic Information Systems (GIS) coarse scale analysis Publicly available GIS data Broad-scale approach, landscape perspective Bankfull Width, Gradient, Bankfull to Valley Width Ratio

4 Subbasin Habitat Reach Length Habitat Streambed Area Sanpoil Subbasin 82 mi 0.5 mi 2 Spokane Subbasin 214 mi 1.1 mi 2 Up. Col. Subbasin 59 mi 0.2 mi 2 Blocked Area Total 355 mi 1.8 mi 2 IP Results: Spring Chinook All Habitats Rated low

5 Subbasin Habitat Reach Length Habitat Streambed Area Sanpoil Subbasin 187 mi 1.1 mi 2 Spokane Subbasin 662 mi 3.2 mi 2 Up. Col. Subbasin 312 mi 1.3 mi 2 Blocked Area Total 1,161 mi 5.6 mi 2 IP Results: Steelhead All Habitats Rated low

6 Ecosystem Diagnosis & Treatment (EDT) Suitability of tributary habitats? SPECIES KNOWLEDGE Timing Location Movement Habitat Potential HABITAT KNOWLEDGE Data Models Prof. judgment Hypotheses RULES How species/ habitat interact

7 EDT - Continued 2 Modeling Efforts CCT Sanpoil & W. Roosevelt Tributaries STI Spokane & E. Roosevelt Tributaries CCT Intensive, Dedicated Monitoring Spokane Independent, Dispersed Monitoring Same species information, habitat rules, & assumptions Results reflect Current Condition Colville Tribe Spokane Tribe & Partners

8 EDT Results Adult Capacity Sanpoil: Spring Chin. = 498 Sum./Fall Chin. = 2,206 Steelhead = 1,709 TOTAL Spring Chinook 1,201 Summer/Fall Chinook 12,138 Steelhead 4,168 TOTAL 17,507 Upper Columbia: Spring Chin. = 160 Sum./Fall Chin. = 397 Steelhead = 385 Spokane: Spring Chin. = 543 Sum./Fall Chin. = 9,535 Steelhead = 2,064

9 EDT Results Productivity Sanpoil: Spring Chin. = 2.25 Sum./Fall Chin. = 3.6 Steelhead = 2.23 # of returning adults per spawner Upper Columbia: Spring Chin. = 2.3 Sum./Fall Chin. = 3.3 Steelhead = 2.3 Spokane: Spring Chin. = 1.8 Sum./Fall Chin. = 3.4 Steelhead = 2.4

10 Sanpoil Sockeye Spawning Habitat Capacity - CCT Sanpoil Habitat Surveys 252,091 m 2 potential spawning habitat Two Approaches: 1. Sockeye Density - # Fish/Spawning Area 2. Redd Size - # Redds/Spawning Area x # Fish/Redd Degrees of Habitat Utilization 25% - 100%

11 Sanpoil Sockeye Spawning Habitat Capacity - CCT 1. Sockeye Density: Habitat Utilization Low Density High Density 25% 70, , % 282,341 1,008, Redd Size: Habitat Utilization Larger Redds Smaller Redds 25% 34,066 72, % 136, ,104

12 Mainstem Chinook Spawning Habitats - CCT Transboundary Reach 36 mi Lake Rufus Woods Hanrahan et al Lake Rufus Woods 17 mi Transboundary Reach In Progress

13 Mainstem Chinook Spawning Habitats - CCT 2-D Hydrodynamic Model: depth, velocity, substrate, channel-bed slope Extrapolate Habitat Area Spawner Capacity Lake Rufus Woods (Hanrahan et al. 2004) ~600 20,000 spawners Transboundary Reach Anticipating significant capacity reach length, known gravel bars, and natural O. mykiss production.

14 Lake Roosevelt Sockeye Smolt Rearing Capacity - STI Capacity based on plankton, not habitat Many techniques, constrained by type and timeframe of available data Euphotic Volume EV = EZD t m SA t (km 2 )

15 Lake Roosevelt Sockeye Smolt Rearing Capacity - STI year averages for May, July, October Assumed smolt yield per EV (BOR 2007a, 2007b) Low Moderate High (6,780/EV Unit) (8,531/EV Unit) (10,455/EV Unit) May 12,046,000 15,157,000 18,576,000 July 23,833,000 29,988,000 36,751,000 October 31,506,000 39,643,000 48,584,000

16 Summary of Results to Date Potential Tributary Habitats (IP) 1,161 miles for Steelhead 355 miles for spring Chinook Tributary Capacity 4,168 Steelhead 13,339 spring & summer/fall Chinook 34,066 >1 million Sanpoil Sockeye Lake Rufus Woods = ~600 20,000 capacity summer/fall Chinook Roosevelt Smolt Capacity = 12 million 48.5 million Sockeye

17 Conclusion & Caveats Significant habitat availability, and suitability... Not all habitats considered, yet Tributary Habitats Several tribs not evaluated, at all Most tribs not evaluated for Sockeye Mainstem Habitats Transboundary Reach, results pending Spokane Arm & River Big picture, also consider Canadian studies & habitats

18 Thank You Photo Credit: Michael Visintainer, Silver Bow Fly Shop