Fish Passage Site 20601542

Coordinates (dec. deg.): 61.07329°, -151.25336°
Legal Description: S011N011W05
Region: South Central
Road Name: Tyonek-Beluga Road

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

Elevation:

Site Comments: None

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey TYCS1-TY016

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Datum = WGS84. 24.5-foot gps accuracy. Culvert B (right) bearing is 145 degrees.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 70.44
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.9 4.7
Height(ft):5.06 5.18
Apron Length(ft):
Water Depth(ft):0.55 0.32
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.37
Outfall Type:
Constriction Ratio:
Culvert Gradient: 2.46%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Improper bedding
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 71.11
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.6 4.9
Height(ft):5.22 5.16
Apron Length(ft):
Water Depth(ft):0.85 0.5
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.37
Outfall Type:
Constriction Ratio:
Culvert Gradient: 2.31%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:GravelCobble
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 35.5 15.14
Downstream ordinary high water 73.0 31.00
Downstream ordinary high water 187.0 16.00
Upstream ordinary high water 5.0 30.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Tailcrest or 1st Thalweg 83.71
D/S Thalweg 0.00 187.0 82.11
D/S Water Surface Elev 0.00 187.0 82.71
D/S OHW Elev 0.00 187.0 83.07
D/S Water Surface Elev 114.00 73.0 83.90
D/S OHW Elev 114.00 73.0 84.32
D/S Thalweg 114.00 73.0 83.44
D/S Thalweg 177.00 10.0 81.14
Max Pool Depth (culvert b = 17.59) 182.00 5.0 82.03
OHW Left Bank 182.00 5.0 84.45
OHW Left Bank 182.00 5.0 85.00
Outlet Rustline Height 2 187.00 0.0 85.09
Outlet Rustline Height 1 187.00 0.0 85.35
Outlet Invert 1 187.00 0.0 84.50
Outlet Thalweg 2 187.00 0.0 83.30
Outlet Thalweg 1 187.00 0.0 82.97
Outlet Invert (lower than a, due to plugging) 2 187.00 0.0 84.32
Outlet Culvert Top 2 187.00 0.0 89.48
Outlet Culvert Top 1 187.00 0.0 89.68
Road Elev 222.00 95.92
Road Elev 222.00 95.96
Inlet Culvert Top 2 257.00 0.0 91.18
Inlet Culvert Top 1 257.00 0.0 91.29
Inlet Culvert Invert 1 257.00 0.0 86.23
Inlet Rustline Height 1 257.00 0.0 87.90
Inlet Rustline Height 2 257.00 0.0 87.94
Inlet Thalweg 2 257.00 0.0 85.89
Inlet Culvert Invert 2 257.00 0.0 85.96
Inlet Thalweg 1 257.00 0.0 85.98
U/S Thalweg 1 258.00 1.0 86.00
U/S Thalweg 2 258.00 1.0 85.83
U/S OHW elevation (unplugging culvert) 2 258.00 1.0 87.75
U/S Thalweg 1 262.00 5.0 85.60
U/S Thalweg 2 262.00 5.0 85.69
U/S Water Surface Elev (we lowered the surface 0.37 by) 2 262.00 5.0 86.85
U/S Thalweg 2 266.20 9.2 85.14
U/S Thalweg 1 268.20 11.2 85.50

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): 1.8
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 0.33

Fish Observations

Species: juvenile/adult coho salmon Life History: Anadromous
Total Fish Observed: 16 Fish Measured: 8 Fork Lengths (mm) Min: 79 Max: 140 Mean: 102
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (16)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 62 Fish Measured: 18 Fork Lengths (mm) Min: 74 Max: 140 Mean: 103
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (8)  Upstream Minnow Trap, 1/4 in. Mesh (54)  
 
Species: slimy sculpin Life History: Unknown
Total Fish Observed: 1 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Minnow Trap, 1/4 in. Mesh (1)  

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