Lake Creek Instream Flow Study Status Update Fish/Aquatics Meeting - - PowerPoint PPT Presentation

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Lake Creek Instream Flow Study Status Update Fish/Aquatics Meeting August 14, 2007 Study Requested by: Washington Department of Ecology US Forest Service US Fish and Wildlife Service Purpose of Study Assess the relationship

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Lake Creek Instream Flow Study Status Update Fish/Aquatics Meeting August 14, 2007

SLIDE 2

Study Requested by:

Washington Department of Ecology
US Forest Service
US Fish and Wildlife Service

SLIDE 3

Purpose of Study

Assess the relationship between flow and

aquatic habitat in Lower Lake Creek

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Status of Investigation

EN conducted physical habitat surveys of

Lake Creek in 2004

3 calibration flow measurements taken

during summer 2004 (3 – 34 cfs)

Spill event for higher flows in 2005 to

extend model range

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Lake Creek Study Sites and Reaches and Fish Distribution

1,000 1,500 2,000 2,500 3,000 3,500 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 RM Elevation (ft) Rainbow Steelhead Chinook Coho Cutthroat Reach 1 Reach 2 Reach 3 Reach 4 Reach 5 SS1 SS2 SS3 Drop Structure SS4 Barrier Barrier

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Amphibians

Species and Life Stages Modeled

– Giant Salamander (Dicamptodon spp.)

Eggs
Larvae

– Coastal Tailed Frogs (Ascaphus truei)

Eggs
Larvae

– Cascade Torrent Salamander (Rhyacotrin cascadae)

Eggs
Larvae

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Status of Investigation, cont’d

Data reduction and model calibration
ccurred in Winter 2006 and Spring 2007.

– Model calibration – Transect and study site weighting – HSI curves – Monthly inflow estimates between sites

WUA produced for target species and life

stages

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Weighted Usable Area

Index of Habitat Quantity

– Square feet/ 1000 linear feet of stream

Does not Indicate the Quality of the

Habitat

– Small amount of very good habitat

– Large amount of marginal habitat

It doesn’t indicate where on the transect

the habitat is located

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Figure 3.3-1 Lake Creek Study Site 1 (T1-4) Fish Rearing Habitat (WUA) vs. Flow

100 200 300 400 500 600 700 800 50 100 150 200 250 300

Streamflow in Cubic Feet Per Second (cfs) WUA (Sq. Ft. of Habitat Per 1000 Ft. of Stream) Chinook Rearing Coho Rearing Steelhead Rearing Cutthroat Rearing Rainbow Rearing Winter Rearing

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Figure 3.3-2 Lake Creek Study Site 1 (T1-4) Fish Spawning Habitat (WUA) vs. Flow

5 10 15 20 25 30 35 40 50 100 150 200 250 Streamflow in Cubic Feet Per Second (cfs) W U A ( S q . F t . o f H a b it a t p e r 1 0 0 0 F t . o f S t re a m ) Chinook Spawning Coho Spaw ning Steelhead Spaw ning Cutthroat Spaw ning Rainbow Spaw ning

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Figure 3.4-4 Lake Creek IFIM SS4 Amphibian Habitat (WUA) vs. Flow 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 1 51 101 151 201 251 Streamflow in Cubic Feet Per Second (cfs)

WUA (Sq. Ft. of Habitat per 1000 Ft. of stream)

Larvae Eggs Eggs and Larvae

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Input Hydrology

Inflow exists in Lake Creek from the Drop

Structure downstream to confluence with the Cowlitz River

Each study site or group of transects will

receive differing amounts of inflow

Inflow varies

– Site to site – Month to month

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Figure 5.2-1 Lake Creek IFIM January: Fish Rearing Habitat (WUA) vs. Flow

500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 7,000 50 100 150 200 250

Streamflow in Cubic Feet Per Second (cfs)

WUA (Sq. Ft. of Habitat per 1000 Ft. of Stream) Chinook Rearing Coho Rearing Steelhead Rearing Cutthroat Rearing Rainbow Rearing Winter Rearing

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Figure 5.2-2 Lake C reek IFIM January: Fish Spawning H abitat (W UA ) vs. Flow

10 20 30 40 50 60 70 80 50 100 150 200 250

Stream flow in Cubic Feet Per Second (cfs)

WUA (Sq. Ft. of Habitat per 1000 Ft. of Stream) C

ho Spawning

Cutthroat Spawning

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Figure 5.3-1 Lake Creek IFIM January Amphibian Habitat (WUA) vs. Flow

500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 50 100 150 200 250 Streamflow in Cubic Feet Per Second (cfs) WUA (Sq. Ft. of Habitat Per 1,000 Ft. of Stream Giant Salamander Larvae Tailed Frog Larvae Torrent Salamander Larvae

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Anticipated Completion of Field Study

Field work has been completed for this

study.

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Anticipated Draft Study Report Due Date:

Habitat Assessment report finalized in

2005

The draft report with modeling results was

distributed in June 2007

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Modifications to Ongoing Studies or New Studies Proposed by Applicant

No modifications to ongoing studies or

new studies are being proposed.

Energy Northwest is currently running

various scenarios that examine historic flow conditions in Lake Creek

Energy Northwest is also modeling the