Fish Passage Site 20601544

Coordinates (dec. deg.): 61.05314°, -151.32193°
Legal Description: S011N012W12
Region: South Central
Road Name: Tyonek Timber Road

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

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-TY018

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Culvert gradient red

Comments: Datum = WGS84. GPS accuracy 17.2 Additional site photos added from April 2016 site visit.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Red
 
Length(ft): 20.92
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):2.9 3.2
Height(ft):2.05 1.95
Apron Length(ft):
Water Depth(ft):0.48 0.68
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.29
Culvert Gradient: 1.53%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is too short
  2. Constriction ratio red
  3. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:Silt/ClayCobble
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 14.0 17.40
Downstream ordinary high water 63.0 8.50
Downstream ordinary high water 102.0 12.00
Upstream ordinary high water 5.0 6.40
Upstream ordinary high water 34.0 9.70
Upstream ordinary high water 68.0 10.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Tailcrest or 1st Thalweg 92.00
D/S Thalweg 0.00 102.0 89.60
D/S Water Surface Elev 0.00 102.0 89.92
D/S OHW Elev 0.00 102.0 90.49
D/S Thalweg 39.00 63.0 90.65
D/S Water Surface Elev 39.00 63.0 91.04
D/S OHW Elev 39.00 63.0 91.29
OHW Left Bank 97.00 5.0 92.80
OHW Left Bank 97.00 5.0 92.57
Max Pool Depth 99.30 2.7 91.40
D/S Thalweg 99.30 2.7 91.40
Outlet Thalweg 1 102.00 0.0 91.73
Outlet Invert 1 102.00 0.0 91.83
Outlet Culvert Top 1 102.00 0.0 93.78
Outlet Rustline Height 1 102.00 0.0 92.74
Road Elev 112.00 95.86
Road Elev 112.00 96.08
Inlet Culvert Top 1 122.00 0.0 94.20
Inlet Rustline Height 1 122.00 0.0 92.92
Inlet Thalweg 1 122.00 0.0 92.10
Inlet Culvert Invert 1 122.00 0.0 92.15
U/S Thalweg 1 123.00 1.0 92.13
U/S OHW elevation 1 123.00 1.0 93.12
U/S Water Surface Elev 1 126.00 4.0 92.63
U/S Thalweg 1 127.00 5.0 91.97
U/S Thalweg 1 127.80 5.8 91.87
U/S Water Surface Elev 156.00 34.0 92.97
U/S Thalweg 156.00 34.0 92.72
U/S Headwater 156.00 34.0 93.21
U/S Water Surface Elev 190.00 68.0 93.39
U/S Headwater 190.00 68.0 94.06
U/S Thalweg 190.00 68.0 93.04

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): 1.5
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 1

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 123 Max: 123 Mean: 123
Collected/Observed by Gear Type: Upstream Minnow Trap, 1/4 in. Mesh (2)  
 
Species: juvenile rainbow trout Life History: Resident
Total Fish Observed: 12 Fish Measured: 6 Fork Lengths (mm) Min: 42 Max: 119 Mean: 79
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (2)  Upstream Minnow Trap, 1/4 in. Mesh (10)  

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