Fish Passage Improvement site 20502081

Fish Passage Site 20502081

Coordinates (dec. deg.): 62.85917°, -149.61298°
Legal Description: S032N002W15
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Talkeetna Mts D-6
AWC Stream #:
Stream Name: Susitna River tributary

Elevation:

Site Comments: Alaska RR at MP 271.7

Survey Date: Jun 15, 2011

Survey MSB11-ARR03

site photos

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient gray
Sediment accumulation
Beaver Activity

Comments: New site found on Alaska RR at MP 271.8. Dwst area from culvert is backwater ponded area from beaver dam. Long profile starts at upstream grade point.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Gray

Length(ft): 41.28

Inlet Type: Mitered

Outlet Type: Projecting

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 4

Approach Angle: 75.0

Sedimentation At Inlet: Yes

Inlet Substrate: Cobble

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	8.55	8.5
Height(ft):	4.75	6.7
Apron Length(ft):	0.0	0.0
Water Depth(ft):		2.89
Rustline Height(ft):	0.45
Substrate Depth(ft):	2.0	2.0

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 2.0

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.16

Culvert Gradient: 1.67%

Max Slope:

Max Slope Length:

Culvert Observations:

Culvert gradient gray
Sediment accumulation
Beaver Activity

Stream Measurements

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

Stream Slope(deg.):	3.78
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	52.0	6.80
Upstream ordinary high water	76.0	7.65
Upstream ordinary high water	85.0	7.60

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
U/S Grade Ctrl (Thalweg) (Middle of riffle)	0.00	95.20
U/S Water Surface Elev (Used for stream gradient)	0.00	95.73
U/S Grade Ctrl (Thalweg) (Top of riffle)	36.00	94.61
U/S Water Surface Elev	36.00	94.98
U/S Grade Ctrl (Thalweg) (Top of riffle)	74.00	92.39
U/S Water Surface Elev	74.00	92.88
U/S Grade Ctrl (Thalweg)	100.00	91.57
U/S Water Surface Elev (Used for stream gradient)	100.00	91.95
U/S Water Surface Elev (Water surface at inlet)	112.00	91.57
Inlet Culvert Invert	112.00	91.25
Inlet Culvert Top	112.00	95.88
Road Elev	132.00	99.56
Outlet Culvert Top	153.28	95.19
Outlet Invert	153.28	88.43
D/S Water Surface Elev (Water surface at outlet)	153.28	91.32
D/S Tailcrest or 1st Thalweg (Tail water control created by beaver dam, creates ponding)	168.28	90.35
D/S Water Surface Elev (Tail water surface)	168.28	91.27

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.