Fish Passage Site 20501092

Coordinates (dec. deg.): 61.57556°, -149.77472°
Legal Description: S017N002W19
Region: South Central
Road Name: Birch Road

Datum: WGS84
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Twin Lake Outlet

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 MSB04-ML066

Observers: Gary Greenberg, I S

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Hydraulic flows exceeded capacity

Comments: None

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 20.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.): 0.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):2.7
Height(ft):2.2
Apron Length(ft):
Water Depth(ft):0.6 0.5
Rustline Height(ft):0.9
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: -0.44%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Hydraulic flows exceeded capacity
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 21.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.): 0.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):2.6
Height(ft):1.1
Apron Length(ft):
Water Depth(ft):0.3 0.3
Rustline Height(ft):0.6
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.90%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Hydraulic flows exceeded capacity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
OHW Left Bank 98.21
OHW Left Bank 98.25
D/S Tailcrest or 1st Thalweg 0.00 5.2 98.08
Max Pool Depth 5.20 0.0 97.81
D/S Thalweg 5.20 0.0 97.81
Outlet Invert 1 5.20 0.0 97.84
Outlet Invert 2 5.20 0.0 97.93
Road Elev 15.20 100.65
Inlet Culvert Invert 2 25.20 0.0 98.33
Inlet Culvert Invert 1 25.20 0.0 97.75
U/S Thalweg 1 30.40 5.2 97.64
U/S Thalweg 2 30.40 5.2 97.71
U/S Water Surface Elev 1 79.20 54.0 98.64
U/S Water Surface Elev 2 79.20 54.0 98.64

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