Fish Passage Improvement site 20501030

Fish Passage Site 20501030

Coordinates (dec. deg.): 61.69328°, -149.30603°
Legal Description: S019N001E32
Region: South Central
Road Name: Edgerton Parks Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Little Susitna River tributary

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-EGP04

site photos

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient red
Constriction ratio red
Mechanical damage or joints parting
Sediment accumulation
Structural Problem

Comments: Updated site photos and fish sampling data added from 8/26/16 site visit from Sampling Unmapped Streams in the MSB project. Top of inlet smashed down approx. .90' as well as the sides.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated aluminum)

Fish Passage Rating: Red

Length(ft): 44.0

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.5

Condition Rating(1-5): 1

Approach Angle: 10.0

Sedimentation At Inlet: Yes

Inlet Substrate: Sand

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	0.9	1.48
Height(ft):	0.5	1.11
Apron Length(ft):	0.0	0.0
Water Depth(ft):		0.19
Rustline Height(ft):	0.35
Substrate Depth(ft):	0.25	0.55

Backwatered?: No

Baffles Present: No

Embedded?: No

Embedded Depth(ft): 0.0

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.42

Culvert Gradient: 2.68%

Max Slope:

Max Slope Length:

Culvert Observations:

Culvert gradient red
Constriction ratio red
Mechanical damage or joints parting
Sediment accumulation
Structural Problem

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	13.0	1.90
Downstream ordinary high water	24.0	2.40
Downstream ordinary high water	30.0	2.10

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Grade Ctrl (Thalweg) (Top of riffle)	0.00	91.84
D/S Water Surface Elev (used for stream gradient)	0.00	92.14
D/S Grade Ctrl (Thalweg)	20.00	92.46
D/S Water Surface Elev (Used for stream gradient)	20.00	92.61
Outlet Invert (on substrate)	30.00	92.95
D/S Water Surface Elev (Water surface at outlet)	30.00	93.14
Outlet Culvert Top	30.00	94.06
Road Elev	52.00	99.97
Inlet Culvert Top	74.00	95.24
Inlet Culvert Invert (on substrate)	74.00	93.90
U/S Water Surface Elev (Water surface at inlet)	74.00	94.01
U/S Grade Ctrl (Thalweg)	89.00	94.36
U/S Water Surface Elev	89.00	94.53

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.