Fish Passage Site 20501067

Coordinates (dec. deg.): 61.62028°, -149.62364°
Legal Description: S018N002W27
Region: South Central
Road Name: Pittman Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10330-2050-3050-4027-5061
Stream Name: Unnamed

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 MSB23-MS106

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio red
  3. Mechanical damage or joints parting

Comments: Outlet crosses a fourwheeler path.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 42.04
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 10.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.03 3.02
Height(ft):2.9 2.7
Apron Length(ft):5.4 5.4
Water Depth(ft):0.0 1.4
Rustline Height(ft):0.75
Substrate Depth(ft):0.0 0.55
Backwatered?: No
Baffles Present:
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: Hydraulic Jump
Constriction Ratio: 0.42
Culvert Gradient: 2.24%
Max Slope:
Max Slope Length:
 

Comments: Jump from pipe to apron. Outlet apron is seperated from pipe, 3 ft gap.
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio red
  3. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySand
Stream Slope(deg.):1.45
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 47.0 8.50
Upstream ordinary high water 62.0 8.10
Upstream ordinary high water 71.0 8.00
Upstream ordinary high water 85.0 4.25

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.10
U/S Thalweg 0.00 96.46
U/S Water Surface Elev 0.00 97.20
U/S Water Surface Elev 83.00 95.45
U/S Thalweg 83.00 95.94
U/S Thalweg 95.00 95.73
U/S Water Surface Elev 95.00 96.16
Inlet Culvert Top 100.00 98.22
U/S Water Surface Elev 100.00 95.52
Inlet Culvert Invert 100.00 95.26
Outlet Invert 142.04 94.71
D/S Water Surface Elev 142.04 96.11
Outlet Culvert Top 142.04 97.28
D/S Water Surface Elev 143.04 94.90
D/S Thalweg 143.04 94.58
D/S Water Surface Elev 148.04 94.68
D/S Thalweg 148.04 94.53
D/S Thalweg 149.04 94.07
D/S Water Surface Elev 149.04 94.73
D/S Water Surface Elev 165.04 94.32
D/S Thalweg 165.04 93.78
D/S Thalweg 237.04 93.07
D/S Water Surface Elev 237.04 93.77

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