Fish Passage Site 20501465

Coordinates (dec. deg.): 61.98934°, -149.97888°
Legal Description: S022N004W22
Region: South Central
Road Name: Hidden Hills Road

Datum: WGS84
Quad Name / ITM: Anchorage D-8
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Unnamed creek

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 PRK09-HHR02

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Culvert is poorly aligned
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert

Comments: Both pipes bent in significantly under road; metal grates over inlets

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 46.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 27.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.0
Height(ft):3.0 2.2
Apron Length(ft):
Water Depth(ft): 1.09
Rustline Height(ft):2.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.66%
Max Slope:
Max Slope Length:
 

Comments: Pipe 1 bent in at outlet;
  Culvert Observations:
  1. Culvert gradient gray
  2. Culvert is poorly aligned
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 50.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 27.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 2.9
Height(ft):2.8 2.75
Apron Length(ft):
Water Depth(ft): 0.46
Rustline Height(ft):1.4
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.31%
Max Slope:
Max Slope Length:
 

Comments: Both pipes bent in significantly under rd
  Culvert Observations:
  1. Culvert is poorly aligned
  2. Mechanical damage or joints parting
  3. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 2 97.41
U/S Headwater 1 97.54
U/S Headwater 2 97.60
Outlet Pool Water Elev 1 97.41
D/S Water Surface Elev (d/s WS) 0.00 80.0 97.39
D/S Tailcrest or 1st Thalweg 1 67.50 12.5 96.57
D/S Water Surface Elev (ws @ TWC) 1 67.50 12.5 97.41
D/S Tailcrest or 1st Thalweg 2 70.50 9.5 96.42
D/S Water Surface Elev 2 70.50 9.5 97.40
D/S Thalweg 2 73.90 6.1 95.38
D/S Thalweg (d/s bottom outlet pool pipe 1) 1 75.30 4.7 95.22
Outlet Invert 1 80.00 0.0 96.32
Outlet Invert 2 80.00 0.0 96.95
Road Elev 104.00 101.45
Inlet Culvert Invert 2 128.00 0.0 97.11
Inlet Culvert Invert 1 128.00 0.0 96.63
U/S Thalweg (u/s edge of roadfill/inlet pool bottom) 1 131.20 3.2 96.10
U/S Thalweg (u/s inlet pool bottom u/s of roadfill) 2 134.10 6.1 95.26

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

Gear Type: Minnow Trap (A) Trap Duration(h): 1.0
Comments: 50ft u/s of culvert
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Comments: 100ft d/s of culvert

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 6 Fish Measured: 6 Fork Lengths (mm) Min: 48 Max: 107 Mean: 76
Collected/Observed by Gear Type: Downstream Minnow Trap (5)  Upstream Minnow Trap (1)  
 
Species: stickleback-unspecified Life History: Resident
Total Fish Observed: 21 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (18)  Upstream Minnow Trap (3)  

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