Fish Passage Improvement site 20501052

Fish Passage Site 20501052

Coordinates (dec. deg.): 61.61350°, -149.64656°
Legal Description: S018N002W33
Region: South Central
Road Name: West Dean Road

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Scott 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 MSB11-WDR01

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: 2011

Site Observations:

None of this type

Comments: Updated site photos and fish capture information from 9/1/16 site visit for Sampling Unmapped Streams in the MSB project. Replaced in 2011. Dowstream area is a bog with a somewhat defined channel and an upstream area with an undefined shallow ponded area. Stream channel is low gradient with some lilly pads present.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Green

Length(ft): 60.1

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.75

Condition Rating(1-5): 5

Approach Angle: 5.0

Sedimentation At Inlet: Yes

Inlet Substrate: Gravel

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	4.0	4.0
Height(ft):	2.5	2.6
Apron Length(ft):
Water Depth(ft):		0.23
Rustline Height(ft):
Substrate Depth(ft):	1.5	1.4

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 1.4

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.91

Culvert Gradient: 0.97%

Max Slope:

Max Slope Length:

Culvert Observations:

None of this type

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Organic	Sand
Subdominant:	Silt/Clay	Silt/Clay

Stream Slope(deg.):	0.29
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	66.0	4.60
Upstream ordinary high water	120.0	4.60
Upstream ordinary high water	165.0	4.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Thalweg (profile pt)	0.00	91.08
D/S Water Surface Elev	0.00	91.44
D/S Tailcrest or 1st Thalweg (tailwater control)	13.00	91.58
D/S Water Surface Elev	13.00	91.78
Outlet Invert (invert on substrate)	36.00	91.81
D/S Water Surface Elev (outlet water surface)	36.00	92.04
Top of Pipe Outlet	36.00	94.36
Road Elev	66.00	100.48
Inlet Culvert Top	96.10	94.94
Inlet Culvert Invert (invert on substrate)	96.10	92.31
U/S Water Surface Elev (inlet water surface)	96.10	92.54
U/S Water Surface Elev	105.10	92.54
U/S Thalweg (profile pt)	105.10	91.61
U/S Water Surface Elev (water surface for gradient)	118.10	92.76
U/S Water Surface Elev (water surface for gradient)	244.10	93.12

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.