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 MSB23-MS089

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Beaver Activity
  2. Inlet perch
  3. Mechanical damage or joints parting
  4. Culvert sagging in middle
  5. Other, including vibrations, cavitation, etc.

Comments: Pipes are in very poor condition, still functional but not for long.Culverts are made with two different types of material, outlets are CAP and inlets are CSP.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Gray
 
Length(ft): 46.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.5
Corrugation Width(in.): 0.5
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.15 3.0
Height(ft):2.74 2.35
Apron Length(ft):
Water Depth(ft):0.0 1.63
Rustline Height(ft):2.2
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.20%
Max Slope:
Max Slope Length:
 

Comments: Inlet #1 has beaver gate that is broken.Outlet corregation 2.75.
  Culvert Observations:
  1. Beaver Activity
  2. Inlet perch
  3. Mechanical damage or joints parting
  4. Culvert sagging in middle
  5. Other, including vibrations, cavitation, etc.
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.): 2.75
Corrugation Width(in.): 0.5
Condition Rating(1-5): 1
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Cobble
InletOutlet
Width(ft):2.75 2.7
Height(ft):2.8 1.6
Apron Length(ft):
Water Depth(ft):0.0 0.63
Rustline Height(ft):2.0
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.17%
Max Slope:
Max Slope Length:
 

Comments: Inlet #2 has beaver gate that is not intact. The culvert also has severe damage inside/outside of culvert. Cannot see through due to smashed/ pinched section. Outlet corregation is 2.05.
  Culvert Observations:
  1. Beaver Activity
  2. Inlet perch
  3. Mechanical damage or joints parting
  4. Culvert sagging in middle
  5. Other, including vibrations, cavitation, etc.

Stream Measurements

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

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Water Surface Elev 0.00 98.07
U/S Water Surface Elev (Culvert water surface) 1 10.00 97.94
Inlet Culvert Top 1 10.00 99.79
Inlet Culvert Top 2 10.00 100.45
Inlet Culvert Invert 1 10.00 96.71
Inlet Culvert Invert 2 10.00 97.69
U/S Water Surface Elev (Culvert water surface) 2 10.00 97.92
Outlet Invert 2 50.20 97.30
Top of Pipe Outlet 2 50.20 99.88
D/S Water Surface Elev 2 50.20 97.93
D/S Thalweg 51.20 95.97
Outlet Invert 1 56.50 96.29
D/S Water Surface Elev 1 56.50 97.92
Outlet Culvert Top 1 56.50 99.23
D/S Water Surface Elev 80.20 97.92

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