Fish Passage Site 20401198

Coordinates (dec. deg.): 61.58475°, -148.98727°
Legal Description: S017N003E07
Region: South Central
Road Name: Maud Road

Datum: WGS84
Quad Name / ITM: Anchorage C-6
AWC Stream #:
Stream Name: McRoberts Creek

Elevation:

Site Comments: DNR/ ADFG road to recreation area.

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 UPD20-MAU01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Kim Clark

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: Yes
Construction Year: 2019


Comments: There are 2 natural steps above inlet formed by logs. Adult salmon observed above steps. The OHW was not re-measured in 2020; the stream widths that were taken in 2009 to determine the OHW was used for the OHW here. Embedded depth per the design and measurements.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Black
 
Length(ft): 0.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 5.0
Corrugation Width(in.): 14.0
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):18.58 18.46
Height(ft):6.1 6.55
Apron Length(ft):
Water Depth(ft): 0.58
Rustline Height(ft):
Substrate Depth(ft):1.64 2.5
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 2.5
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.6
Culvert Gradient: 3.61%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleCobble
Stream Slope(deg.):5.86
Stream Flow Stage:Low

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg (on riffle around corner) 0.00 85.45
D/S Water Surface Elev 0.00 86.35
D/S Thalweg (pool below step wood/gravel) 37.00 86.47
D/S Water Surface Elev 37.00 87.26
D/S Water Surface Elev 41.00 87.86
D/S Grade Ctrl (Thalweg) (top of wood/gravel step) 41.00 87.18
D/S Thalweg (middle of riffle below outlet) 77.00 88.01
D/S Water Surface Elev 77.00 88.86
Outlet Invert 103.00 89.50
D/S Water Surface Elev 103.00 90.08
Outlet Culvert Top 103.00 95.89
Inlet Culvert Invert 166.00 91.83
U/S Water Surface Elev 166.00 92.45
Inlet Culvert Top 166.00 98.36
U/S Thalweg (pool beloew wood step #1) 235.00 94.09
U/S Water Surface Elev 235.00 94.99
U/S Grade Ctrl (Thalweg) (top of wood step #1) 237.50 96.37
U/S Water Surface Elev 237.50 96.79
U/S Water Surface Elev 284.00 98.03
U/S Thalweg (pool beloew wood step #2) 284.00 96.59
U/S Water Surface Elev 288.00 98.29
U/S Grade Ctrl (Thalweg) (top of wood step #2) 288.00 98.72

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