Fish Passage Site 20103957

Coordinates (dec. deg.): 62.79039°, -145.44411°
Legal Description: C012N001W29
Region: South Central
Road Name: Pipeline Access Road

Quad Name / ITM: Gulkana D-3
AWC Stream #:
Stream Name: Gillespie Creek


Site Comments: PLMP 635.17

Survey Date: Sep 07, 2020

Survey UPD21-TAP6

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kirsti Jurica, Nicole Farnham

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Culvert gradient red
  2. Damage associated with ice problems
  3. Hydraulic flows exceeded capacity

Comments: Evidence of streamflow's overtopping the road.. Overflow pipe above main pipe included in long profile. Submitted by Kirsti Jurica with CRWP.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated aluminum) Fish Passage Rating: Red
Length(ft): 52.65
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 9.5
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):8.23 7.75
Height(ft):5.42 6.81
Apron Length(ft):
Water Depth(ft): 4.06
Rustline Height(ft):3.55
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.01
Outfall Type: At Stream Grade
Constriction Ratio: 1.12
Culvert Gradient: 2.20%
Max Slope:
Max Slope Length:

Comments: Inlet substrate is marked armor rock.

  Culvert Observations:
  1. Culvert gradient red
  2. Damage associated with ice problems
  3. Hydraulic flows exceeded capacity

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):2
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Upstream ordinary high water 8.80
Upstream ordinary high water 5.70
Upstream ordinary high water 7.50


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Inlet Culvert Top (Pipe #1) 95.00
Inlet Culvert Invert (Overflow Pipe) 95.77
Inlet Culvert Top (Overflow Pipe) 98.80
Road Elev 101.16
Outlet Culvert Top (Overflow Pipe) 98.31
Outlet Invert (Overflow Pipe) 95.27
U/S Thalweg 0.00 89.22
U/S Water Surface Elev 0.00 92.54
Inlet Culvert Invert (Pipe #1) 21.00 89.58
U/S Water Surface Elev 21.00 92.47
Top of Pipe Outlet (Pipe #1) 74.00 95.22
Outlet Invert (Pipe #1) 74.00 88.41
D/S Water Surface Elev 74.00 92.47
Max Pool Depth 82.00 89.61
D/S Water Surface Elev 82.00 92.46
D/S Tailcrest or 1st Thalweg 94.00 91.51
D/S Water Surface Elev 94.00 92.32
D/S Thalweg 160.00 90.37
D/S Water Surface Elev 160.00 91.09
D/S Thalweg 206.00 88.91
D/S Water Surface Elev 206.00 89.61


  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