Fish Passage Site 10302160

Coordinates (dec. deg.): 58.35649°, -134.51527°
Legal Description: C040S066E33
Region: Southeast
Road Name: Egan Drive

Datum: NAD83
Quad Name / ITM: Juneau B-2
AWC Stream #:
Stream Name: Switzer Creek

Elevation:

Site Comments: No traps were set as stream is already in the AWC. Mitered headwall. Large pipe arches. Rustline indeterminate on both pipes. Both pipes influenced by tidal flux. Numerous smolt and salmonid fry were observed upstream and downstream of culverts. Both culverts have substrate greater than one foot but less than the haunch height and support baffles along the bottom. May have been embedded as built with more substrate at one time, however current conditions do not meet the embedded criteria for pipe arches. Culvert 1 is set more as an overflow pipe, all flow is through culvert 2.

Survey Date: Jun 22, 2011

Survey SEA11-EGN01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Mark Eisenman, Jason Olds

Overall Fish Passage Rating: Green

Tidal: Yes
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. None of this type

Comments: None

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 230.78
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 9.5
Condition Rating(1-5): 4
Approach Angle: 39.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):19.8 19.3
Height(ft):14.6 15.1
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.77
Rustline Height(ft):
Substrate Depth(ft):2.0 1.7
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 2.28
Culvert Gradient: 0.32%
Max Slope:
Max Slope Length:
 

Comments: Culvert length is the total length with the inlet miter measuring 13.1' and the outlet miter measuring 12.8'. Pipe gradient was determined using the T.O.P. elevations with a pipe length of 204.88.
  Culvert Observations:
  1. None of this type
ID: 2 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 230.76
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 9.5
Condition Rating(1-5): 4
Approach Angle: 39.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):19.3 20.4
Height(ft):14.7 15.1
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.14
Rustline Height(ft):
Substrate Depth(ft):2.0 1.9
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 2.28
Culvert Gradient: 0.35%
Max Slope:
Max Slope Length:
 

Comments: Culvert length is the total length with the inlet miter measuring 14.8' and the outlet miter measuring 15.3'. Pipe gradient was determined using the T.O.P. elevations with a culvert length of 200.66.
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelOrganic
Subdominant:CobbleSilt/Clay
Stream Slope(deg.):0.56
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 53.0 11.80
Upstream ordinary high water 103.0 13.00
Upstream ordinary high water 188.0 11.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 117.15
D/S Grade Ctrl (Thalweg) 0.00 97.47
D/S Water Surface Elev 0.00 97.91
D/S Water Surface Elev 90.00 97.96
D/S Tailcrest or 1st Thalweg 90.00 97.21
Outlet Pool Water Elev 108.00 97.95
Max Pool Depth 108.00 95.66
Outlet Thalweg (Invert out, culvert 1, on substrate, end of miter) 1 148.00 97.20
D/S Water Surface Elev (Invert out, culvert 1, end of miter) 1 148.00 97.97
Outlet Thalweg (Invert out, culvert 2, on substrate, end of miter) 2 148.00 98.01
D/S Water Surface Elev (Invert out, culvert 2, end of miter) 2 148.00 98.15
Outlet Culvert Top (Invert out, culvert 1, on metal, top of miter) 1 160.20 112.70
Outlet Culvert Top (Invert out, culvert 2, on metal, top of miter) 2 163.30 113.44
Inlet Culvert Top (Invert in, culvert 2, on metal, top of miter) 2 364.00 114.15
Inlet Culvert Top (Invert in, culvert 1, on metal, top of miter) 1 365.70 113.35
Inlet Thalweg (Invert in, culvert 2, on substrate, end of miter) 2 378.80 99.04
U/S Headwater (Invert in, culvert 2, end of miter, 1st resting) 2 378.80 99.60
Inlet Thalweg (Invert in, culvert 1, end of miter, dry) 1 378.80 100.39
U/S Water Surface Elev 430.80 99.64
U/S Grade Ctrl (Thalweg) 430.80 99.04
U/S Grade Ctrl (Thalweg) 483.80 99.71
U/S Water Surface Elev 483.80 100.10
U/S Water Surface Elev 523.80 100.28
U/S Grade Ctrl (Thalweg) 523.80 99.97
U/S Grade Ctrl (Thalweg) 642.80 100.35
U/S Water Surface Elev 642.80 100.82

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Visual Observation, Ground (A)
Comments: Visual observation of unknown juvenile salmonids upstream and downstream from culverts.
 
Gear Type: Visual Observation, Ground (B) Trap Duration(h): 30.0
Channel Type: Main Channel (>50% of water flow)
Comments: Visual observations

Fish Observations

Species: juvenile salmonid-unspecified Life History: Unknown
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 5 Max: 5 Mean: 5
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  
 
Species: smolt salmonid-unspecified Life History: Unknown
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 10 Max: 10 Mean: 10
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (1)  

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