Fish Passage Improvement site 20501427

Fish Passage Site 20501427

Coordinates (dec. deg.): 61.68673°, -149.96953°
Legal Description: S019N004W34
Region: South Central
Road Name: Parks Highway

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #: 247-41-10100-2231-3050
Stream Name: Nancy Creek

Elevation:

Site Comments: SUSITNA RIVER WATERSHED

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-PRK01

site photos

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

None of this type

Comments: Old USGS crest stage gaging station located upst. Concrete footer of open arch culvert scoured approx 2' at inlet.

Culvert Measurements

ID: 1

Structure Type: Open-bottom arch (Corrugated steel)

Fish Passage Rating: Green

Length(ft): 109.9

Inlet Type: Headwall

Outlet Type: Mitered

Corrugation Depth(in.): 1.75

Corrugation Width(in.): 6.0

Condition Rating(1-5): 2

Approach Angle: 25.0

Sedimentation At Inlet: No

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	19.6	19.33
Height(ft):	12.83	10.44
Apron Length(ft):	0.0	0.0
Water Depth(ft):		0.45
Rustline Height(ft):	0.0
Substrate Depth(ft):

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.96

Culvert Gradient: 1.70%

Max Slope:

Max Slope Length:

Culvert Observations:

None of this type

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Cobble	Cobble
Subdominant:	Boulder	Gravel

Stream Slope(deg.):	2.27
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	90.0	9.30
Upstream ordinary high water	128.0	10.45
Upstream ordinary high water	167.0	10.20

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Grade Ctrl (Thalweg) (Top of riffle)	0.00	99.13
D/S Water Surface Elev (Tail Water Surface)	0.00	99.38
D/S Grade Ctrl (Thalweg) (Top of riffle)	39.00	99.99
D/S Water Surface Elev	39.00	100.44
D/S Water Surface Elev	80.00	100.69
D/S Grade Ctrl (Thalweg)	80.00	100.14
Outlet Invert	195.00	102.11
D/S Water Surface Elev (Water surface at outlet)	195.00	102.56
Road Elev	245.00	123.39
Inlet Culvert Invert	304.90	103.81
U/S Water Surface Elev (Water surface at inlet)	304.90	104.49
U/S Water Surface Elev (Water surface of upstream pool)	318.90	104.53
Max Pool Depth (Upstream max pool depth)	318.90	102.55

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.