Fish Passage Improvement site 20501801

Fish Passage Site 20501801

Coordinates (dec. deg.): 62.10559°, -150.06868°
Legal Description: S023N004W06
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Talkeetna A-1
AWC Stream #:
Stream Name: Little Montana Creek

Elevation:

Site Comments: ARR milepost 211.15; Montana Creek side channel.

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 UPDATE-AKR08

site photos

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Mark Eisenman, Gillian O'Doherty

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2014

Comments: Beautiful habitat upstream and downstream of culvert. Fish observed upstream.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Green

Length(ft): 60.5

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 5

Approach Angle: 33.0

Sedimentation At Inlet: No

Inlet Substrate: Sand

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	7.9	7.9
Height(ft):	7.0	6.4
Apron Length(ft):
Water Depth(ft):		0.6
Rustline Height(ft):
Substrate Depth(ft):	1.0	1.6

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.91

Culvert Gradient: 0.17%

Max Slope:

Max Slope Length:

Comments: Culvert not technically embedded and set a little high, but there is substrate throughout barrel.

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Sand	Cobble
Subdominant:	Organic	Gravel

Stream Slope(deg.):
Stream Flow Stage:	Medium

No stream width data available.

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Grade Ctrl (Thalweg)	0.00	83.03
D/S Water Surface Elev	0.00	83.69
D/S Water Surface Elev (Pool Water surface)	11.00	83.66
Max Pool Depth	11.00	79.72
D/S Water Surface Elev	18.00	83.91
D/S Thalweg (End of rocky ramp)	18.00	84.44
Outlet Invert (On substrate)	64.00	84.49
D/S Water Surface Elev	64.00	85.09
Outlet Culvert Top	64.00	91.08
Inlet Culvert Top	124.50	91.18
U/S Water Surface Elev	124.50	85.34
Inlet Culvert Invert	124.50	84.18
U/S Water Surface Elev	236.50	85.38

Notes:

River distance is measured continuously throughout the survey reach along the thalweg of the stream.
Measured from each end of the crossing along the thalweg of the stream.