Fish Passage Site 20501062

Coordinates (dec. deg.): 61.61646°, -149.61978°
Legal Description: S018N002W27
Region: South Central
Road Name: Pittman Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
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 MSB23-MS107

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red

Comments: Stream crosses 4 wheeler trail on outlet side, travels down the path before entering back into natural channel. Stream went under landowner fence & onto landowner property on inlet side.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 44.16
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 40.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.02 2.96
Height(ft):3.02 2.97
Apron Length(ft):5.0 5.0
Water Depth(ft):0.0 0.49
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: 0.0
Outfall Type: Smooth Flow Over Apron
Constriction Ratio: 0.96
Culvert Gradient: 3.26%
Max Slope:
Max Slope Length:
 

Comments: Hydraulic jump inside the pipe.
  Culvert Observations:
  1. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):3.58
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 29.0 4.60
Upstream ordinary high water 50.0 3.80
Upstream ordinary high water 66.0 2.20
Upstream ordinary high water 75.0 1.95

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.38
U/S Water Surface Elev 0.00 97.44
U/S Thalweg 0.00 96.23
U/S Thalweg 50.00 96.53
U/S Water Surface Elev 50.00 96.78
U/S Thalweg 59.00 95.35
U/S Water Surface Elev 59.00 95.64
U/S Water Surface Elev 65.00 95.66
Inlet Culvert Top 65.00 98.34
Inlet Culvert Invert 65.00 95.27
D/S Water Surface Elev 109.16 94.38
Outlet Invert 109.16 93.89
Outlet Culvert Top 109.16 96.90
D/S Thalweg (Out Apron Top) 115.16 94.15
D/S Water Surface Elev (Out Apron WS) 115.16 94.33
D/S Thalweg 123.16 93.34
D/S Water Surface Elev 123.16 93.70
D/S Thalweg 150.16 92.95
D/S Water Surface Elev 150.16 93.15
D/S Thalweg 174.16 91.10
D/S Water Surface Elev 174.16 91.60
D/S Thalweg 214.16 89.09
D/S Water Surface Elev 214.16 89.78

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