Fish Passage Site 20504054

Coordinates (dec. deg.): 61.69127°, -150.03159°
Legal Description: S019N004W32
Region: South Central
Road Name: Nancy Lake Road

Datum:
Quad Name / ITM: Tyonek C-1
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: None

Survey Date: Sep 26, 2023

Survey MSB23-MS065

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kat Leavitt, Beth Evers

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height gray
  2. Culvert gradient red

Comments: Lots of little step downs and pools on outlet side. Inlet side is wetland area.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 84.76
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 4
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):2.96 3.01
Height(ft):3.01 2.9
Apron Length(ft):
Water Depth(ft):0.0 0.1
Rustline Height(ft):0.6
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.17
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.72
Culvert Gradient: 1.53%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Outfall height gray
  2. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySand
Stream Slope(deg.):2.89
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream bed width 53.0 3.60
Downstream bed width 75.0 4.70
Downstream bed width 96.0 4.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 99.69
D/S Thalweg 0.00 87.38
D/S Water Surface Elev 0.00 87.89
D/S Thalweg 6.00 87.99
D/S Water Surface Elev 6.00 88.34
D/S Thalweg 68.00 89.55
D/S Water Surface Elev 68.00 89.84
D/S Thalweg 90.00 90.67
D/S Water Surface Elev 90.00 90.83
D/S Thalweg 100.00 91.14
D/S Water Surface Elev (Pool water surface) 100.00 91.58
Outlet Invert 101.00 91.65
D/S Water Surface Elev 101.00 91.75
Outlet Culvert Top 101.00 94.54
Inlet Culvert Top 185.76 95.85
Inlet Culvert Invert 185.76 92.83
U/S Water Surface Elev 185.76 93.07
U/S Headwater 215.76 93.91

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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