Fish Passage Site 20601541

Coordinates (dec. deg.): 61.03326°, -151.31047°
Legal Description: S011N011W19
Region: South Central
Road Name:

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-TY015

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Datum = WGS84. accuracy 19.8 ft

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 39.8
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.625
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):5.2 5.3
Height(ft):4.49 4.4
Apron Length(ft):
Water Depth(ft):1.0 0.88
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.03
Outfall Type:
Constriction Ratio: 0.33
Culvert Gradient: 1.06%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is too short
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 39.7
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.625
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.9 5.15
Height(ft):5.08 4.91
Apron Length(ft):
Water Depth(ft):0.8 0.86
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.03
Outfall Type:
Constriction Ratio: 0.33
Culvert Gradient: 1.26%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is too short
ID: 3 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 39.8
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.625
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.75 5.0
Height(ft):5.18 4.55
Apron Length(ft):
Water Depth(ft):0.6 1.05
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.03
Outfall Type:
Constriction Ratio: 0.33
Culvert Gradient: 2.01%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is too short

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:BoulderBoulder
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 46.0 65.60
Downstream ordinary high water 111.0 49.70
Downstream ordinary high water 183.0 44.00
Upstream ordinary high water 5.0 28.60
Upstream ordinary high water 136.0 41.50
Upstream ordinary high water 203.0 49.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Tailcrest or 1st Thalweg 88.01
D/S Thalweg (Q) 0.00 183.0 85.24
D/S Water Surface Elev 0.00 183.0 86.14
D/S OHW Elev 0.00 183.0 87.28
D/S Water Surface Elev 72.00 111.0 87.38
D/S Thalweg 72.00 111.0 86.46
D/S OHW Elev 72.00 111.0 88.51
D/S Thalweg 175.00 8.0 86.13
Max Pool Depth (B=13.48 c=13.18) 178.00 5.0 86.68
OHW Left Bank 178.00 5.0 89.09
OHW Left Bank 178.00 5.0 89.87
Outlet Rustline Height 1 183.00 0.0 89.87
Outlet Rustline Height 3 183.00 0.0 89.48
Outlet Thalweg 1 183.00 0.0 87.24
Outlet Thalweg 3 183.00 0.0 87.72
Outlet Thalweg 2 183.00 0.0 87.75
Outlet Invert 3 183.00 0.0 88.07
Outlet Invert 1 183.00 0.0 88.31
Outlet Invert 2 183.00 0.0 88.35
Outlet Rustline Height 2 183.00 0.0 90.15
Outlet Culvert Top 3 183.00 0.0 92.62
Outlet Culvert Top 1 183.00 0.0 92.71
Outlet Culvert Top 2 183.00 0.0 93.26
Road Elev 202.50 96.48
Road Elev 202.50 96.59
Inlet Culvert Top 2 222.00 0.0 93.93
Inlet Culvert Top 3 222.00 0.0 94.05
Inlet Culvert Top 1 222.00 0.0 93.22
Inlet Rustline Height 2 222.00 0.0 90.17
Inlet Rustline Height 3 222.00 0.0 90.28
Inlet Thalweg 2 222.00 0.0 88.15
Inlet Rustline Height 1 222.00 0.0 89.97
Inlet Thalweg 1 222.00 0.0 88.65
Inlet Culvert Invert 1 222.00 0.0 88.73
Inlet Thalweg 3 222.00 0.0 88.82
Inlet Culvert Invert 2 222.00 0.0 88.85
Inlet Culvert Invert 3 222.00 0.0 88.87
U/S Thalweg 3 223.00 1.0 88.53
U/S Thalweg 1 223.00 1.0 88.60
U/S Thalweg 2 223.00 1.0 88.32
U/S OHW elevation 1 223.00 1.0 90.47
U/S Thalweg 3 227.00 5.0 88.39
U/S Water Surface Elev 1 227.00 5.0 89.77
U/S Thalweg 2 227.00 5.0 89.11
U/S Thalweg 1 227.00 5.0 89.40
U/S Thalweg 3 231.50 9.5 88.72
U/S Thalweg 2 231.80 9.8 89.37
U/S Thalweg 1 232.00 10.0 89.46
U/S Thalweg 358.00 136.0 90.75
U/S Water Surface Elev 358.00 136.0 91.75
U/S Headwater 358.00 136.0 92.38
U/S Headwater 425.00 203.0 93.33
U/S Water Surface Elev 425.00 203.0 92.37
U/S Thalweg 425.00 203.0 91.70

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): 2
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 2.5

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 61 Fish Measured: 20 Fork Lengths (mm) Min: 57 Max: 128 Mean: 80
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (30)  Upstream Minnow Trap, 1/4 in. Mesh (31)  
 
Species: adult sculpin-unspecified Life History: Resident
Total Fish Observed: 23 Fish Measured: 1 Fork Lengths (mm) Min: 109 Max: 109 Mean: 109
Collected/Observed by Gear Type: Upstream Minnow Trap, 1/4 in. Mesh (23)  

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