on Mainstem Redwood Creek David G. Anderson NPS Fishery Biologist - - PowerPoint PPT Presentation

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on Mainstem Redwood Creek David G. Anderson NPS Fishery Biologist - - PowerPoint PPT Presentation

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Status of Summer Steelhead on Mainstem Redwood Creek David G. Anderson NPS Fishery Biologist Redwood Creek Symposium December 10, 2014 Redwood Creek Watershed Redwood Creek Estuary Redwood Creek Summer Steelhead 1968 Fishing Map

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Status of Summer Steelhead

  • n Mainstem Redwood Creek

David G. Anderson NPS Fishery Biologist

Redwood Creek Symposium December 10, 2014

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Redwood Creek Watershed

Redwood Creek Estuary

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Redwood Creek Summer Steelhead

1968 Fishing Map

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Redwood Creek Summer Steelhead

  • Determined to be Summer Steelhead,

not runbacks

 Based on summer ovary to total weight ratio

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Summer Steelhead

(Oncorhynchus mykiss)

  • Found in pools and

pools associated with cooler tributary inflow

  • Pools with structure

 Boulders  Woody Debris

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Monitoring

  • Surveys started in 1981

 Continuing to the present (2014)  34 years

  • Snorkel Survey Reach

 Lacks Creek to Downstream of

Hayes Creek

 RNP and Green Diamond

  • 38.9 km (24.1 miles)

 36% of mainstem Redwood Cr

  • 7 days

 Last week of July  First week of August

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SLIDE 7
  • Snorkel Crews

 Mask and Snorkel  5/4 Surfsuits w/Hood  Gloves  Wading Boots  Dive Weights  Dry Bags

1990s 2010s

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SLIDE 8

Stream Atlas

GIS MAPS

Red Ticks - 50 meter intervals for river kilometer UTM Grid – 100 meters GPS – sometimes spotty coverage, and not waterproof

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Diver Safety

Streamside Grow Things to be aware of : Natural and Human Slips, Trips, & Falls Entanglement Giardia Poison Oak Hypothermia Safety Plan Radios Communication Dive Buddy Awareness

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SLIDE 10
  • Mainstem

Redwood Creek

 ‘Rocky Gorge’ area

and above

  • Deeper pools
  • More Gradient

 Lower river

  • Wider and shallower
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Other Fish Recorded

  • Coastal Cutthroat Trout
  • Juvenile Salmonids

 Chinook  Steelhead  Coho

  • Suckers & Sculpin &

Threespine Stickleback

  • Spring Chinook (1988)
  • Sockeye (2005 & 2007)

Schools of Suckers Sockeye Salmon Cutthroat Trout

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Other Species

  • Lamprey

 redds

  • Amphibians

Rough-skinned Newt Western Toad Tadpoles

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Aquatic Mammals

  • River Otters
  • Beaver

Beaver Scat

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Rare Species

  • Western Pearlshell Freshwater Mussels

 Long-lived

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Steelhead River Mortality

Since 1992

5 Dead Summer Steelhead Observed

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SLIDE 19
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July and August 2013

Mean 17.8°C ≥ 18°C 35% Mean 19.96°C ≥ 18°C 94%

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Tributary Water Temperature

  • All Tributaries are colder than the

corresponding Redwood Creek temperature measured at the same time.

  • Westside tributaries are generally cooler

than eastside tributaries, a pattern repeated in all past surveys

  • 2013 Mean Temperature

 13.0°C Westside  13.6°C Eastside

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Drought – Is Low Flow Affecting Summer Steelhead Numbers Observed?

  • Fish No./km vs.

Orick Annual Mean Daily Flow

  • (1981 – 2014)
  • Correlation

 0.05

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SLIDE 23

2011 NOAA Status Update

  • STATUS REVIEW UPDATE FOR PACIFIC

SALMON AND STEELHEAD LISTED UNDER THE ENDANGERED SPECIES ACT: SOUTHWEST

  • 20 May 2011
  • “Of continued concern is the depressed status of at

least two of the remaining summer-run populations in the DPS, Redwood Creek and Mattole River. Although surveys within these watersheds do not typically encompass all available over-summering habitats, the chronically low numbers seen during surveys in these rivers suggest that both populations are likely at high risk of extinction.”

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Questions?

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