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 MSB09-MAU01

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Constriction ratio gray
  2. Inlet perch
  3. Woody Debris
  4. Sediment accumulation

Comments: Pipes separating from headwall

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 30.6
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 13.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):4.7 4.2
Height(ft):2.5 1.8
Apron Length(ft):
Water Depth(ft): 0.21
Rustline Height(ft):1.6
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.68
Culvert Gradient:
Max Slope:
Max Slope Length:
 

Comments: Pipes separating from headwall; plugged; no flow
  Culvert Observations:
  1. Constriction ratio gray
  2. Woody Debris
  3. Sediment accumulation
ID: 2 Structure Type: Open-bottom arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 30.4
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 13.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):4.8 4.8
Height(ft):2.1 2.3
Apron Length(ft):
Water Depth(ft): 0.87
Rustline Height(ft):1.2
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.68
Culvert Gradient: 3.30%
Max Slope:
Max Slope Length:
 

Comments: pipes separating from headwall; uniform riffle through pipe; pipe slope calc'd based on ws;
  Culvert Observations:
  1. Constriction ratio gray
  2. Inlet perch
  3. Woody Debris
  4. Sediment accumulation
ID: 3 Structure Type: Open-bottom arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 30.5
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 13.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):4.7 5.0
Height(ft):2.2 2.1
Apron Length(ft):
Water Depth(ft): 0.4
Rustline Height(ft):0.6
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.68
Culvert Gradient: 4.62%
Max Slope:
Max Slope Length:
 

Comments: pipes separating from headwall; plugged; pipe slope calc'd based on ws;
  Culvert Observations:
  1. Constriction ratio gray
  2. Woody Debris
  3. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelGravel
Stream Slope(deg.):5.86
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 54.0 11.50
Upstream ordinary high water 171.0 13.50
Upstream ordinary high water 200.0 10.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev (between pipes 2 and 3) 2 95.56
Outlet Pool Water Elev (between pipes 2 and 3) 3 95.56
Outlet Pool Water Elev 1 95.57
U/S Headwater (turbulent at end of pipe) 2 96.56
U/S Headwater 3 96.97
U/S Headwater (pool at side) 1 96.99
D/S Grade Ctrl (Thalweg) 0.00 53.0 93.93
D/S Water Surface Elev (@GP) 0.00 53.0 94.58
D/S Grade Ctrl (Thalweg) (1st GP for main flow) 44.50 8.5 95.05
D/S Water Surface Elev (@GP) 44.50 8.5 95.54
D/S Grade Ctrl (Thalweg) 1 50.50 2.5 95.43
D/S Water Surface Elev (@GP) 1 50.50 2.5 95.57
Outlet Invert 3 53.00 0.0 95.16
Outlet Invert 1 53.00 0.0 95.36
Outlet Invert 2 53.00 0.0 94.69
Inlet Culvert Invert 2 83.40 0.0 95.94
Inlet Culvert Invert 3 83.50 0.0 96.62
Inlet Culvert Invert 1 83.60 0.0 95.81
U/S Thalweg 89.50 6.0 96.68
U/S Grade Ctrl (Thalweg) (at embedded log) 115.50 32.0 97.85
D/S Water Surface Elev 115.50 32.0 98.39
Road Elev 147.00 100.23
U/S Thalweg (bottom of plunge over big log) 173.50 90.0 98.91
U/S Grade Ctrl (Thalweg) (top of big embedded log) 174.50 91.0 101.71
D/S Water Surface Elev (@GP) 174.50 91.0 102.11
U/S Grade Ctrl (Thalweg) (u/s on embedded log) 215.60 132.0 104.00
D/S Water Surface Elev (@GP) 215.60 132.0 104.25

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