Fish Passage Site 20601533

Coordinates (dec. deg.): 61.11139°, -151.17406°
Legal Description: S012N011W23
Region: South Central
Road Name: Logging Road

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

Elevation:

Site Comments: None

Survey Date: Jun 06, 2002

Survey TYCS1-TY007

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

Comments: Datum = WGS84. gps accuracy = 24.7 ft. Erosion control fabric wrapped around entire inlet fill slope. Beaver pond located upstream of culvert.. 2016 Site visit notes: Big scour pool at outlet. Silt fence and landscape fabric all over site. Evidence of road failures. Site rating changed to Red to reflect constriction, culvert is not backwatered.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Red
 
Length(ft): 59.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.625
Corrugation Width(in.): 2.33
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.5 3.5
Height(ft):3.5 3.52
Apron Length(ft):
Water Depth(ft):0.92 0.85
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.15
Culvert Gradient: 0.70%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandGravel
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 37.0 19.50
Downstream ordinary high water 62.0 16.00
Downstream ordinary high water 93.0 9.00
Upstream ordinary high water 5.0 13.80
Upstream ordinary high water 40.0 24.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 91.37
OHW Left Bank 91.65
D/S Thalweg 0.00 93.0 89.46
D/S OHW Elev 0.00 93.0 90.21
D/S Water Surface Elev 0.00 93.0 89.75
D/S OHW Elev 31.50 61.5 90.94
D/S Water Surface Elev 31.50 61.5 90.46
D/S Thalweg 31.50 61.5 89.67
D/S Tailcrest or 1st Thalweg 56.00 37.0 90.87
D/S Thalweg 83.00 10.0 86.90
Max Pool Depth 1 88.00 5.0 87.15
Outlet Invert 1 93.00 0.0 90.73
Outlet Thalweg 1 93.00 0.0 89.77
Outlet Rustline Height 1 93.00 0.0 91.54
Outlet Culvert Top 1 93.00 0.0 94.25
Road Elev 122.50 96.87
Road Elev 122.50 96.96
Inlet Culvert Top 1 152.00 0.0 94.65
Inlet Rustline Height 1 152.00 0.0 92.22
Inlet Culvert Invert 1 152.00 0.0 91.15
Inlet Thalweg 1 152.00 0.0 90.82
U/S Thalweg 1 153.00 1.0 90.94
U/S Thalweg 1 157.00 5.0 90.97
U/S Water Surface Elev 1 157.00 5.0 92.11
U/S OHW elevation 1 157.00 5.0 92.49
U/S Thalweg 1 159.00 7.0 91.09
U/S Water Surface Elev 192.00 40.0 92.15
U/S Headwater (beaver pond upstream) 192.00 40.0 92.40
U/S Thalweg 192.00 40.0 91.76

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 (B) Trap Duration(h): 1
 
Gear Type: Minnow Trap (C) Trap Duration(h): 18.0
Comments: Trap set about 20 feet downstream

Fish Observations

Species: adult Dolly Varden Life History: Unknown
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 111 Max: 111 Mean: 111
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (2)  
 
Species: threespine stickleback Life History: Resident
Total Fish Observed: 2 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  Downstream Minnow Trap, 1/4 in. Mesh (1)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 61 Fish Measured: 12 Fork Lengths (mm) Min: 60 Max: 103 Mean: 74
Collected/Observed by Gear Type: Downstream Minnow Trap (2)  Downstream Minnow Trap, 1/4 in. Mesh (59)  

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