Fish Passage Site 20601534

Coordinates (dec. deg.): 61.07681°, -151.31593°
Legal Description: S011N012W01
Region: South Central
Road Name:

Datum: NAD83
Quad Name / ITM: Tyonek A-4
AWC Stream #:
Stream Name: Tyonek Creek

Elevation:

Site Comments: None

Survey Date: Jun 07, 2002

Survey TYCS1-TY008

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Datum = WGS84. Short culvert and steep fill yield fill sedimentation (fines) in streambed. Culverts had become plugged with beaver dam. At 2016 site visit C2 was taking all flow and potentially causing a juvenile barrier, but adults could likely still navigate it. C1 is 100% blocked.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 60.1
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):8.8 8.95
Height(ft):7.61 7.08
Apron Length(ft):
Water Depth(ft):1.25
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio: 0.9
Culvert Gradient: 0.13%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Road Fill (pushed off road by grader)
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 60.3
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):8.9 9.0
Height(ft): 7.12
Apron Length(ft):
Water Depth(ft):5.25
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio: 0.9
Culvert Gradient:
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Road Fill (pushed off road by grader)

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:SandCobble
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 5.7 24.60
Downstream ordinary high water 50.0 14.80
Downstream ordinary high water 97.0 16.00
Upstream ordinary high water 5.0 41.00
Upstream ordinary high water 97.5 15.70
Upstream ordinary high water 198.4 23.80

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg 0.00 97.0 84.12
D/S Water Surface Elev 0.00 97.0 84.67
D/S OHW Elev 0.00 97.0 84.75
D/S Thalweg 47.00 50.0 84.60
D/S Water Surface Elev 47.00 50.0 85.17
D/S OHW Elev 47.00 50.0 85.42
D/S Tailcrest or 1st Thalweg 91.30 5.7 84.67
OHW Left Bank (culv b = 14.02) 93.50 3.5 85.52
OHW Left Bank 93.50 3.5 86.54
Max Pool Depth 2 94.00 3.0 85.37
D/S Thalweg (culv b = 14.63) 94.00 3.0 84.62
Max Pool Depth 1 94.00 3.0 84.62
Outlet Invert 1 97.00 0.0 84.46
Outlet Thalweg 1 97.00 0.0 84.50
Outlet Invert 2 97.00 0.0 84.75
Outlet Thalweg 2 97.00 0.0 85.37
Outlet Rustline Height 1 97.00 0.0 85.46
Outlet Culvert Top 1 97.00 0.0 91.54
Outlet Rustline Height 2 97.00 0.0 85.69
Outlet Culvert Top 2 97.00 0.0 91.87
Road Elev 127.00 94.12
Road Elev 127.00 94.12
Inlet Culvert Top 1 157.00 0.0 92.15
Inlet Culvert Top 2 157.00 0.0 91.83
Inlet Thalweg 2 157.00 0.0 85.58
Inlet Rustline Height 1 157.00 0.0 85.65
Inlet Thalweg 1 157.00 0.0 84.87
Inlet Culvert Invert 1 157.00 0.0 84.54
U/S Thalweg 2 158.00 1.0 85.50
U/S Thalweg 1 158.00 1.0 85.00
U/S Thalweg 2 162.00 5.0 84.85
U/S OHW elevation 1 162.00 5.0 86.56
U/S Water Surface Elev 1 162.00 5.0 86.04
U/S Thalweg 1 162.00 5.0 84.96
U/S Thalweg 2 174.80 17.8 84.83
U/S Thalweg 1 174.80 17.8 84.50
U/S Thalweg 254.50 97.5 84.06
U/S Water Surface Elev 254.50 97.5 86.10
U/S Headwater 254.50 97.5 86.25
U/S Water Surface Elev 355.40 198.4 86.08
U/S Headwater 355.40 198.4 86.81
U/S Thalweg 355.40 198.4 84.77

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: Minnow Trap, 1/4 in. Mesh (A) Trap Duration(h): 1
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 1

Fish Observations

Species: juvenile Dolly Varden Life History: Unknown
Total Fish Observed: 4 Fish Measured: 2 Fork Lengths (mm) Min: 125 Max: 168 Mean: 146
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (4)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 83 Fish Measured: 20 Fork Lengths (mm) Min: 69 Max: 134 Mean: 89
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (35)  Upstream Minnow Trap, 1/4 in. Mesh (48)  
 
Species: sculpin-unspecified Life History: Resident
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 89 Max: 89 Mean: 89
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (2)  

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