Fish Passage Site 20501466

Coordinates (dec. deg.): 61.98929°, -149.99706°
Legal Description: S022N004W22
Region: South Central
Road Name: Hidden Hills Road

Datum: WGS84
Quad Name / ITM: Anchorage D-8
AWC Stream #:
Stream Name: Caswell 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 PRK09-HHR03

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Mechanical damage or joints parting
  2. Culvert gradient red
  3. Structural Problem
  4. Shallow fill; inadequate roadfill volume above culvert

Comments: Visual observation of juvenile salmonids (which side of culvert was not recorded).

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 46.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 1
Approach Angle: 16.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.5 3.5
Height(ft):2.5 1.9
Apron Length(ft):
Water Depth(ft): 1.32
Rustline Height(ft):2.45
Substrate Depth(ft):0.3
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.45%
Max Slope:
Max Slope Length:
 

Comments: Pipe 1 is collapsed 3' in from inlet. Probably rusted through bottom. No freeboard @ base. Outlet mostly buried
  Culvert Observations:
  1. Mechanical damage or joints parting
  2. Structural Problem
  3. Shallow fill; inadequate roadfill volume above culvert
  4. Compound gradient in pipe
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 40.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 39.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.4 3.5
Height(ft):2.6 3.5
Apron Length(ft):
Water Depth(ft): 0.91
Rustline Height(ft):1.65
Substrate Depth(ft):0.5 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 2.18%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Mechanical damage or joints parting
  3. Structural Problem
  4. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:Silt/ClaySilt/Clay
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 97.34
Outlet Pool Water Elev 1 97.39
U/S Headwater 1 97.62
U/S Headwater 2 97.68
D/S Grade Ctrl (Thalweg) 0.00 75.0 95.53
D/S Water Surface Elev (ws @ gp - use ws for d/s grade) 0.00 75.0 97.34
D/S Water Surface Elev (ws @ GP) 2 73.40 1.6 97.77
Outlet Invert 1 75.00 0.0 96.07
Outlet Invert 2 75.00 0.0 96.43
Road Elev 96.50 101.98
Inlet Culvert Invert 2 118.00 0.0 97.31
Inlet Culvert Invert 1 118.00 0.0 96.28
U/S Thalweg (TC of u/s pool) 2 119.60 1.6 97.30
U/S Grade Ctrl (Thalweg) (run u/s) 1 121.20 3.2 98.71

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: Visual Observation, Ground (A)
Comments: Visual observation of juvenile salmonids, which side of culvert not recorded.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov