Fish Passage Site 20601527

Coordinates (dec. deg.): 61.06325°, -151.36644°
Legal Description: S011N012W11
Region: South Central
Road Name: Tyonek Timber Road

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

Elevation:

Site Comments: AKA Roberts Creek

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-TY001

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Datum = WGS84. GPS Accuarcy 170 ft.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 85.67
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: None
Outlet Substrate: None
InletOutlet
Width(ft):4.9 4.9
Height(ft):4.92 8.77
Apron Length(ft):
Water Depth(ft):0.8 0.58
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.02
Outfall Type:
Constriction Ratio: 0.36
Culvert Gradient: 5.59%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 87.05
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: None
Outlet Substrate: None
InletOutlet
Width(ft):5.0 5.0
Height(ft):4.94 8.8
Apron Length(ft):
Water Depth(ft):0.7 0.35
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.02
Outfall Type:
Constriction Ratio: 0.36
Culvert Gradient: 6.00%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:SandBoulder
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 27.0 36.70
Downstream ordinary high water 50.0 44.50
Downstream ordinary high water 100.0 34.00
Upstream ordinary high water 5.0 31.00
Upstream ordinary high water 15.0 18.00
Upstream ordinary high water 121.0 36.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 76.37
D/S Thalweg 0.00 100.0 76.92
D/S Water Surface Elev 0.00 100.0 77.56
D/S OHW Elev 0.00 100.0 78.44
D/S Thalweg 50.00 50.0 77.75
D/S Water Surface Elev 50.00 50.0 79.19
D/S OHW Elev 50.00 50.0 79.75
D/S Tailcrest or 1st Thalweg 73.00 27.0 78.62
OHW Left Bank 92.00 8.0 75.67
D/S Thalweg 93.00 7.0 72.25
Max Pool Depth 1 95.00 5.0 72.67
Max Pool Depth 2 95.00 5.0 73.48
Outlet Thalweg 1 100.00 0.0 74.67
Outlet Thalweg 2 100.00 0.0 74.75
Outlet Invert 2 100.00 0.0 75.34
Outlet Invert 1 100.00 0.0 75.48
Outlet Rustline Height 2 100.00 0.0 76.46
Outlet Rustline Height 1 100.00 0.0 76.83
Outlet Culvert Top 2 100.00 0.0 84.14
Outlet Culvert Top 1 100.00 0.0 84.25
Road Elev 143.00 94.54
Road Elev 143.00 0.0 94.73
Inlet Culvert Top 1 186.00 0.0 85.19
Inlet Culvert Top 2 186.00 0.0 85.50
Inlet Rustline Height 2 186.00 0.0 81.37
Inlet Rustline Height 1 186.00 0.0 81.40
Inlet Culvert Invert 1 186.00 0.0 80.27
Inlet Thalweg 1 186.00 0.0 80.27
Inlet Culvert Invert 2 186.00 0.0 80.56
Inlet Thalweg 2 186.00 0.0 80.56
U/S Thalweg 2 187.00 1.0 80.56
U/S Thalweg 1 187.00 1.0 80.35
U/S Thalweg 1 191.00 5.0 80.73
U/S Thalweg 2 191.00 5.0 80.96
U/S Water Surface Elev 2 191.00 5.0 81.15
U/S Water Surface Elev 1 191.00 5.0 81.27
U/S OHW elevation 2 191.00 5.0 82.08
U/S OHW elevation 1 191.00 5.0 82.31
U/S Thalweg 2 196.00 10.0 80.42
U/S Thalweg 1 196.00 10.0 80.46
U/S Water Surface Elev 236.00 50.0 82.21
U/S Thalweg 236.00 50.0 81.67
U/S Headwater 236.00 50.0 82.77
U/S Water Surface Elev 307.00 121.0 83.35
U/S Headwater 307.00 121.0 84.60
U/S Thalweg 307.00 121.0 82.69

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): 3
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 2

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 36 Fish Measured: 12 Fork Lengths (mm) Min: 64 Max: 122 Mean: 83
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (32)  Upstream Minnow Trap, 1/4 in. Mesh (4)  

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov