CUSHMAN RESERVOIRS. Skokomish Watershed Monitoring Conference - Public Meeting Florian Leischner 9/17/2015

Transcription

1 CUSHMAN RESERVOIRS Skokomish Watershed Monitoring Conference - Public Meeting Florian Leischner 9/17/2015

2 CUSHMAN RESERVOIRS MONITORING Management and monitoring of Tacoma Power reservoirs Lake Cushman and Lake Kokanee Leah Marquez-Glynn, Power Management Tacoma Power Salmon Reintroductions and Fish Facilities - Andy Ollenburg, Cushman Fish Facilities Manager Tacoma Power Fish Passage Monitoring Matt Bleich, Fish Passage Biologist Tacoma Power Reservoir fisheries management and monitoring- Florian Leischner, Fish Population and Habitat Biologist Tacoma Power 2

3 PROJECT AT A GLANCE Cushman Reservoir: Storage Kokanee Reservoir: Regulation 3

4 DATA MONITORING Continuously monitor: Elevation Discharge Generator status Calculate average daily inflows Calculate change in storage volume Inflows equal discharge +/- change in volume Incorporate and monitor Short- and long-term weather and climate prediction Track winter snowpack

5 DROUGHT

6 2015 DROUGHT NF Skokomish Flows: Reduced flows in spring (20% reductions) Reservoir dropped below 735 ft during summer (minimum of end of August) Cushman No. 2 produced essentially no power from April 15 through Labor Day 6

7 FISH PASSAGE

8 FISH PASSAGE

9 # of fish Live Fish Upstream of Little Falls Lacked permit required to operate adult trap at Cushman Dam No. 2, trap operation began on November 12 th Coho Chum Steelhead Flow Flow(cfs) Oct 10-Nov 10-Dec 10-Jan 10-Feb 10-Mar 10-Apr 10-May 10-Jun 10-Jul 10-Aug Flow data obtained from USGS

10 # of fish Live Fish Upstream of Little Falls Coho Chum January 7-13th: Side channel pool blew out Steelhead during 1000cfs release Flow Before: After: 600 Flow(cfs) Oct 10-Nov 10-Dec 10-Jan 10-Feb 10-Mar 10-Apr 10-May 10-Jun 10-Jul 10-Aug Flow data obtained from USGS

11 ADULT UPSTREAM PASSAGE Potential pathways: Moved upstream into lake or tributary stream Moved downstream into North Fork Lethally removed Transferred to one of the new hatchery programs 11

12 HATCHERY FACILITIES Under construction 12

13 DOWNSTREAM PASSAGE

14 FLOATING SURFACE COLLECTOR Three major components Fish Exclusion Net Net Transition Structure Floating Surface Collector 14

15 DOWNSTREAM MONITORING METHODS System Survival PIT mark-recapture 2015 reduced sample size Fish Collection Efficiency Acoustic Telemetry 3 Dimensional Positioning Data processed in Sept Presence/Absence Data processed weekly PIT mark recapture Reduced standard error 15

16 METHODS (CONT.) Weekly Estimates Release Groups Array Deployment Week SS FCE PIT(n) FCE - AT May May May June June June June Total

17 POTENTIAL ADULT RETURNS Species Life stage at release Release Number SAR Adults Totals Sockeye Fed Fry (May) 200, Fed Fry (June) 1,000, ,000 22,200 Fed Fry (Sept) 800, ,000 Spring Chinook Fingerling 300, ,050 Yearling 75, ,388 Winter Steelhead Smolts 15, Adults Coho Smolts 10,000-35, ,750 17

18 HISTORY OF LAKE CUSHMAN FISHERIES MANAGEMENT Over 100 years of resident fish stockings 1899 Lake Cushman 2,500 Brook Trout 18

19 19 HISTORY OF LAKE CUSHMAN FISHERIES MANAGEMENT

20 HISTORY OF LAKE CUSHMAN FISHERIES MANAGEMENT 1983: last of kokanee plants 2000 and prior: Cutthroat 2001: 210 Cutthroat Since early 2000 s, Cushman fisheries have been targeting self-sustaining population Put-and-take fishery at Lake Kokanee: 2001 to present: rainbow trout 20

21 WDFW SURVEY 18 horizontal gillnets, 9 vertical gillnets, 4 fyke nets and 30 boat electrofishing sections 21

22 2012 SPECIES COMPOSITION Species composition by weight by number Size range (mm TL) Species (G) (%) wt (#) (%) n Chinook salmon (Oncorhynchus tshawytscha) Kokanee salmon (Oncorhynchus nerka) 4, Cutthroat trout (Oncorhynchus clarki) 9, Bull trout (Salvelinus confluentus) 16, Mountain whitefish (Prosopium williamsoni) 3, Salish sucker (Catostomus catostomus) 11, Speckled dace (Rhinichthys falcatus) Cotidae spp Total 45,

23 2013 SPECIES COMPOSITION Species composition by weight by number Size range (mm TL) Species (kg) (%) wt (#) (%) n Chinook salmon (Oncorhynchus tshawytscha) Kokanee salmon (Oncorhynchus nerka) Cutthroat trout (Oncorhynchus clarki) Bull trout (Salvelinus confluentus) Mountain whitefish (Prosopium williamsoni) Salish sucker (Catostomus catostomus) Speckled dace (Rhinichthys osculus) Cotidae spp Largemouth bass (Micropterus salmoides) Total

24 CUSHMAN FISHERIES Photo: Steven Rosenow 24

25 CUSHMAN FISHERIES Photo: Steven Rosenow 25

26 CUSHMAN FISHERIES Photo: Steven Rosenow 26

27 ANADROMOUS FISH PASSAGE Photo: Fish Eye Guy Photography 27

28 ANADROMOUS FISH PASSAGE Photo: Fish Eye Guy Photography 28

29 ANADROMOUS FISH PASSAGE Estimated return at 22,200 (27.5% lake survival, 4% ocean survival) Photo: Fish Eye Guy Photography 29

30 ANADROMOUS FISH PASSAGE Estimated return at 22,200 (27.5% lake survival, 4% ocean survival) Ocean survival among sockeye populations 0.2% to 23.5% Photo: Fish Eye Guy Photography 30

31 ANADROMOUS FISH PASSAGE Estimated return at 22,200 (27.5% lake survival, 4% ocean survival) Ocean survival among sockeye populations 0.2% to 23.5% Return rate - 1,100 to 130,000 adult fish Photo: Fish Eye Guy Photography 31

32 ANADROMOUS FISH PASSAGE Kokanee? Sockeye? Photo: Fish Eye Guy Photography 32

33 RESIDENT TROUT FISHERIES Cushman settlement: 33,333 pounds of rainbow trout stocked in area lakes Annual stocking of 11,667 pounds into Lake Kokanee Monitoring: Creel Survey , every 5 years thereafter 33

34 LAKE KOKANEE FISHERY MONITORING # of days of creel surveys Holiday Weekday Weekend Grand Total May 15-Sept 15 April 15-Sept 15 March 1- Sept 15 34

35 CPUE (fish/hour) LAKE KOKANEE FISHERY MONITORING Linear (2012) Linear (2013) Linear (2014) /12 4/1 4/21 5/11 5/31 6/20 7/10 7/30 8/19 9/8 Date 35

36 CPUE per Angler party (fish/hour) Rainbow trout per stocking LAKE KOKANEE FISHERY MONITORING Daily mean CPUE per angler party /25/2014 4/1/2014 5/6/2014 6/10/2014 7/15/2014 8/19/2014 Date 0 36

37 37 QUESTIONS?