Fish Passage Site 20601540

Coordinates (dec. deg.): 61.04521°, -151.18027°
Legal Description: S011N011W14
Region: South Central
Road Name: Tyonek Timber Road

Datum: NAD83
Quad Name / ITM: Tyonek A-4
AWC Stream #: 247-20-10040
Stream Name: Tyonek Creek

Elevation:

Site Comments: None

Survey Date: Jun 11, 2002

Survey TYCS1-TY014

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 gray

Comments: Datum = WGS84. accuracy 19.3 ft, Site visit in 2012 found the inlets had been bent up and are now creating a barrier to fish passage. 2016 site visit. Bent inlet had been cut off removing inlet perch. Site still constricted.

Culvert Measurements

ID: 1 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating: Red
 
Length(ft): 106.3
Inlet Type: Mitered
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 1
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.1 7.1
Height(ft):5.05 5.54
Apron Length(ft):
Water Depth(ft):1.35 2.42
Rustline Height(ft):
Substrate Depth(ft):0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: -0.06
Outfall Type:
Constriction Ratio: 0.37
Culvert Gradient: 1.20%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:NoneCobble
Subdominant:NoneCobble
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 120.0 19.30
Downstream ordinary high water 180.0 18.00
Upstream ordinary high water 5.0 17.60
Upstream ordinary high water 58.0 16.40
Upstream ordinary high water 84.0 16.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Tailcrest or 1st Thalweg 92.97
OHW Left Bank 94.04
D/S OHW Elev 0.00 180.0 93.41
D/S Thalweg 0.00 180.0 91.51
D/S Water Surface Elev 0.00 180.0 92.43
D/S Thalweg 60.00 120.0 92.76
D/S Water Surface Elev 60.00 120.0 93.41
D/S OHW Elev 60.00 120.0 93.94
D/S Thalweg 158.00 22.0 89.97
Max Pool Depth 175.00 5.0 91.58
OHW Left Bank 175.00 5.0 94.74
Outlet Rustline Height (evidence of algal growth~5 in) 1 180.00 0.0 94.52
Outlet Culvert Top 1 180.00 0.0 97.10
Outlet Thalweg 1 180.00 0.0 91.87
Outlet Invert 1 180.00 0.0 91.56
Road Elev 233.00 118.45
Road Elev 233.00 119.25
Inlet Culvert Top 1 286.00 0.0 97.89
Inlet Rustline Height 1 286.00 0.0 94.62
Inlet Culvert Invert 1 286.00 0.0 92.84
Inlet Thalweg 1 286.00 0.0 92.84
U/S Thalweg 1 286.00 0.0 92.96
U/S OHW elevation 1 287.00 1.0 94.42
U/S Water Surface Elev 1 291.00 5.0 94.13
U/S Thalweg 1 291.00 5.0 93.09
U/S Thalweg 1 298.20 12.2 93.18
U/S Thalweg 344.00 58.0 93.68
U/S Water Surface Elev 344.00 58.0 94.64
U/S Headwater 344.00 58.0 95.34
U/S Headwater 370.00 84.0 95.84
U/S Water Surface Elev 370.00 84.0 94.82
U/S Thalweg 370.00 84.0 94.27

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): 2.0
 
Gear Type: Minnow Trap, 1/4 in. Mesh (B) Trap Duration(h): 1

Fish Observations

Species: juvenile Dolly Varden Life History: Unknown
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 125 Max: 125 Mean: 125
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (2)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 104 Fish Measured: 20 Fork Lengths (mm) Min: 62 Max: 111 Mean: 88
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (75)  Upstream Minnow Trap, 1/4 in. Mesh (29)  

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