Fish Passage Site 20501203

Coordinates (dec. deg.): 61.48902°, -149.67320°
Legal Description: S016N002W08
Region: South Central
Road Name: O'Grady Drive

Datum: WGS84
Quad Name / ITM: Anchorage B-8
AWC Stream #:
Stream Name: O'Brien Creek

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-MS018

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2022


Site Observations:

  1. None of this type

Comments: None

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 45.12
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 5
Approach Angle: 37.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.2 5.2
Height(ft):3.6 3.3
Apron Length(ft):
Water Depth(ft):0.0 0.0
Rustline Height(ft):0.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height:
Outfall Type: Overflow Pipe
Constriction Ratio: 2.56
Culvert Gradient: 0.62%
Max Slope:
Max Slope Length:
 

Comments: No rust lines. Constriction ratio is greater than 2 - Observe for future stability.
  Culvert Observations:
  1. None of this type
ID: 2 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
 
Length(ft): 49.58
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 9.5
Condition Rating(1-5): 5
Approach Angle: 37.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):12.4 12.4
Height(ft):5.6 5.0
Apron Length(ft):
Water Depth(ft):0.0 1.17
Rustline Height(ft):
Substrate Depth(ft):1.07 1.75
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.07
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 2.56
Culvert Gradient: 0.60%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:CobbleBoulder
Stream Slope(deg.):0.39
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 99.0 4.70
Upstream ordinary high water 106.0 5.00
Upstream ordinary high water 142.0 4.60
Upstream ordinary high water 200.0 5.10

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Invert 1 95.99
Inlet Culvert Invert 1 96.05
Outlet Culvert Top 1 99.28
Inlet Culvert Top 1 99.56
Road Elev 102.49
U/S Water Surface Elev 0.00 96.71
U/S Thalweg 0.00 94.78
U/S Thalweg 46.00 95.51
U/S Water Surface Elev 46.00 96.61
U/S Water Surface Elev 61.00 96.51
U/S Thalweg 61.00 96.07
U/S Water Surface Elev 80.00 96.23
U/S Thalweg 80.00 95.95
U/S Water Surface Elev 110.00 96.07
U/S Thalweg 110.00 95.47
U/S Water Surface Elev 2 117.00 95.87
Inlet Culvert Invert 2 117.00 95.38
Inlet Culvert Top 2 117.00 100.48
Outlet Culvert Top 2 166.58 100.18
Outlet Invert 2 166.58 94.71
D/S Water Surface Elev 2 166.58 95.88
D/S Water Surface Elev 200.58 95.83
D/S Thalweg 200.58 94.47
D/S Thalweg 234.58 94.46
D/S Water Surface Elev 234.58 95.72
D/S Thalweg 263.58 93.84
D/S Water Surface Elev 263.58 95.67

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