Fish Passage Site 20501082

Coordinates (dec. deg.): 61.58226°, -149.72548°
Legal Description: S017N003W12
Region: South Central
Road Name: Airolo Road

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name:

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-MS072

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio gray
  3. Culvert sagging in middle

Comments: The culvert is sagging extremely in the middle, challenging to get culvert length due to inability to see the other side of culvert. The road is sagging where the culvert is located.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 20.05
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 15.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):2.4 2.3
Height(ft):2.65 2.0
Apron Length(ft):
Water Depth(ft):0.0 1.15
Rustline Height(ft):1.6
Substrate Depth(ft):0.0 0.85
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.62
Culvert Gradient: 6.50%
Max Slope:
Max Slope Length:
 

Comments: Inlet has no sediment inside culvert but at outlet there is sediment accumulation at exit,
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio gray
  3. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:GravelGravel
Stream Slope(deg.):1.95
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 22.0 5.00
Upstream ordinary high water 35.0 4.90
Upstream ordinary high water 52.0 2.60
Upstream ordinary high water 71.0 2.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 102.02
D/S Water Surface Elev 0.00 97.69
D/S Thalweg 0.00 95.88
D/S Thalweg 41.00 96.66
D/S Water Surface Elev 41.00 98.30
D/S Thalweg 73.00 97.56
D/S Water Surface Elev 73.00 99.09
Outlet Invert 103.00 98.32
D/S Water Surface Elev 103.00 99.47
Outlet Culvert Top 103.00 100.22
Inlet Culvert Top 123.05 101.53
U/S Water Surface Elev 123.05 99.95
Inlet Culvert Invert 123.05 99.06
U/S Thalweg 155.05 99.38
U/S Water Surface Elev 155.05 100.08
U/S Thalweg 184.05 99.75
U/S Water Surface Elev 184.05 101.36
U/S Thalweg 223.05 100.78
U/S Water Surface Elev 223.05 102.05

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