Fish Passage Improvement site 20502123

Fish Passage Site 20502123

Coordinates (dec. deg.): 61.64512°, -149.87674°
Legal Description: S018N003W18
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Lake Creek tributary

Elevation:

Site Comments: Alaska RR at MP 176.26. Upst 60' is a culvert under the Parks Highway

Survey Date: Sep 13, 2011

Survey MSB11-AKR03

site photos

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Abraham Gioffre, Jim Latham

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert sagging in middle

Comments: A new site on the railroad which has a braided channel downstream that flows into a marshland. Upstream 60 feet is a culvert under the Parks Highway so stream meaurements could only be taken 60 feet upstream. The stream measurements could be influenced by the culvert on the Parks.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Green

Length(ft): 50.2

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.5

Condition Rating(1-5): 3

Approach Angle: 26.0

Sedimentation At Inlet: Yes

Inlet Substrate: Gravel

Outlet Substrate: Organic

	Inlet	Outlet
Width(ft):	4.7	4.8
Height(ft):	2.75	3.85
Apron Length(ft):
Water Depth(ft):		1.15
Rustline Height(ft):	1.3
Substrate Depth(ft):	1.9	1.0

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 1.0

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.0

Culvert Gradient: 0.38%

Max Slope:

Max Slope Length:

Comments: No stream gradient measured.

Culvert Observations:

Culvert sagging in middle

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	25.0	5.00
Upstream ordinary high water	50.0	3.50
Upstream ordinary high water	60.0	5.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Thalweg (profile pt)	0.00	89.20
D/S Water Surface Elev	0.00	89.97
D/S Grade Ctrl (Thalweg) (Grade pt at woody debris)	22.00	89.94
D/S Water Surface Elev	22.00	91.09
D/S Water Surface Elev	36.00	91.25
D/S Tailcrest or 1st Thalweg (tailwater control)	36.00	90.71
D/S Water Surface Elev (outlet water surface)	47.00	91.28
Outlet Invert (invert on substrate)	47.00	90.13
Outlet Culvert Top	47.00	93.98
Road Elev	72.00	99.78
Inlet Culvert Invert (invert on substrate)	97.00	91.06
Inlet Culvert Top	97.00	94.17
U/S Water Surface Elev (inlet water surface)	97.00	91.74
U/S Grade Ctrl (Thalweg) (grade pt)	125.00	92.46
U/S Water Surface Elev	125.00	92.87
U/S Thalweg (profile pt)	140.00	93.07
U/S Water Surface Elev	140.00	93.76
U/S Thalweg (profile pt)	170.00	94.35
U/S Water Surface Elev	170.00	95.07

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.