Fish Passage Site 20501223

Coordinates (dec. deg.): 61.48386°, -149.68298°
Legal Description: S016N002W17
Region: South Central
Road Name: Royal Lane

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-MS020

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2022


Site Observations:

  1. None of this type

Comments: Low flow channel is widening and losing large bank material. Both culverts are new.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 59.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 32.0
Sedimentation At Inlet: Yes
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):5.3 5.2
Height(ft):3.4 3.2
Apron Length(ft):
Water Depth(ft):0.0 0.36
Rustline Height(ft):
Substrate Depth(ft):0.2 0.5
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.2
Outfall Height:
Outfall Type:
Constriction Ratio: 1.72
Culvert Gradient: 0.29%
Max Slope:
Max Slope Length:
 

Comments: Culvert #1 is drainage pipe for overflow, there is sediment inside but it is not embedded. There is small pool of water inside, not flowing.
  Culvert Observations:
  1. None of this type
ID: 2 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
 
Length(ft): 58.59
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 3.0
Corrugation Width(in.): 9.5
Condition Rating(1-5): 5
Approach Angle: 32.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):15.0 15.0
Height(ft):5.6 5.75
Apron Length(ft):
Water Depth(ft):0.0 0.36
Rustline Height(ft):0.0
Substrate Depth(ft):1.6 1.2
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.2
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 1.72
Culvert Gradient: 0.51%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):0.15
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 68.0 8.00
Downstream ordinary high water 80.0 10.00
Downstream ordinary high water 86.0 8.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 0.00 93.17
U/S Water Surface Elev 0.00 94.11
U/S Water Surface Elev 78.00 94.12
U/S Thalweg 78.00 93.58
Inlet Culvert Invert 2 84.00 93.61
Inlet Culvert Invert 1 84.00 94.28
U/S Water Surface Elev 2 84.00 93.97
Inlet Culvert Top 1 84.00 97.75
Inlet Culvert Top 2 84.00 99.68
Outlet Culvert Top 2 142.59 99.38
D/S Water Surface Elev 2 142.59 94.00
Outlet Invert 2 142.59 93.41
Outlet Invert 1 143.30 94.36
Outlet Culvert Top 1 143.30 97.58
D/S Thalweg 179.59 92.70
D/S Water Surface Elev 179.59 93.96
D/S Thalweg 194.59 93.19
D/S Water Surface Elev 194.59 93.85
D/S Water Surface Elev 247.59 93.72
D/S Thalweg 247.59 92.61

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