Fish Passage Site 20601551

Coordinates (dec. deg.): 61.05428°, -151.51000°
Legal Description: S011N013W12
Region: South Central
Road Name:

Datum: NAD83
Quad Name / ITM: Tyonek A-5
AWC Stream #:
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-TY025

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Datum = WGS84. gps accuracy = 18.1 feet. Culvert collapsed in middle (due to shallow road fill on top). Joints parting at ends of 5-foot middle section. Balls got stuck - no barrel velocity collected.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 40.4
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):4.02 3.84
Height(ft): 4.27
Apron Length(ft):
Water Depth(ft):0.13 0.08
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 1.19
Outfall Type:
Constriction Ratio: 0.65
Culvert Gradient: 13.32%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleGravel
Subdominant:BoulderCobble
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 12.0 18.50
Downstream ordinary high water 64.0 7.80
Downstream ordinary high water 130.0 6.00
Upstream ordinary high water 5.0 11.60
Upstream ordinary high water 55.0 6.00
Upstream ordinary high water 86.0 6.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Tailcrest or 1st Thalweg 96.41
D/S Thalweg 0.00 130.0 91.88
D/S Water Surface Elev 0.00 130.0 91.93
D/S OHW Elev 0.00 130.0 92.59
D/S Thalweg 66.00 64.0 94.90
D/S Water Surface Elev 66.00 64.0 95.06
D/S OHW Elev 66.00 64.0 95.54
D/S Thalweg 124.20 5.8 94.94
Max Pool Depth 1 125.00 5.0 95.10
OHW Left Bank 125.00 5.0 96.58
OHW Left Bank 125.00 5.0 97.00
Outlet Invert 1 130.00 0.0 97.69
Outlet Rustline Height 1 130.00 0.0 99.04
Outlet Culvert Top 1 130.00 0.0 101.96
Outlet Thalweg 1 130.00 0.0 96.63
Road Elev 150.00 106.86
Road Elev 150.00 107.14
Inlet Rustline Height 1 170.00 0.0 104.21
Inlet Thalweg 1 170.00 0.0 102.30
Inlet Culvert Invert 1 170.00 0.0 103.07
U/S Thalweg 1 171.00 1.0 102.10
U/S OHW elevation 1 171.00 1.0 103.93
U/S Thalweg 1 175.00 5.0 102.20
U/S Water Surface Elev 1 175.00 5.0 103.20
U/S Thalweg 1 178.04 8.04 101.98
U/S Thalweg 225.00 55.0 105.33
U/S Water Surface Elev 225.00 55.0 105.38
U/S Headwater 225.00 55.0 105.92
U/S Thalweg 256.00 86.0 107.10
U/S Water Surface Elev 256.00 86.0 107.13
U/S Headwater 256.00 86.0 107.52

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): 1

Fish Observations

Species: juvenile Dolly Varden Life History: Resident
Total Fish Observed: 30 Fish Measured: 12 Fork Lengths (mm) Min: 95 Max: 161 Mean: 116
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (26)  Upstream Minnow Trap, 1/4 in. Mesh (4)  

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