Fish Passage Improvement site 20501245

Fish Passage Site 20501245

Coordinates (dec. deg.): 61.76456°, -149.58237°
Legal Description: S019N002W02
Region: South Central
Road Name: Willow Fishhook Road

Datum: WGS84
Quad Name / ITM: Anchorage D-7
AWC Stream #:
Stream Name: Willow Creek tributary

Elevation:

Site Comments: Flows into slough of Willow creek.

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 MSB09-WFR07

site photos

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient red
Outfall height red
Shallow fill; inadequate roadfill volume above culvert

Comments: Pipe rusted all around; flows into slough of willow creek. **Updated site photos added from 9/20/16 site visit from Sampling Unmapped Streams in the MSB project. Fish sampling information entered into AFFI.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 40.4

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5): 3

Approach Angle: 0.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	1.5	1.5
Height(ft):	1.5	1.3
Apron Length(ft):
Water Depth(ft):		0.05
Rustline Height(ft):	1.5
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.84

Outfall Type: Cascade Over Rip-Rap

Constriction Ratio:

Culvert Gradient: 2.95%

Max Slope:

Max Slope Length:

Culvert Observations:

Culvert gradient red
Outfall height red
Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

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

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

No stream width data available.

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Pool Water Elev	1			96.25
U/S Headwater (pool immed. u/s of inlet)	1			98.40
D/S Water Surface Elev (WS of slough at confluence)	1	0.00	20.0	95.53
D/S Grade Ctrl (Thalweg)	1	11.50	8.5	95.75
D/S Water Surface Elev (@GP)	1	11.50	8.5	95.86
D/S Tailcrest or 1st Thalweg	1	14.50	5.5	96.05
D/S Water Surface Elev (@TWC)	1	14.50	5.5	96.22
D/S Thalweg (bottom of out pool)	1	15.70	4.3	95.67
D/S Thalweg (bottom of cascade out)	1	19.00	1.0	95.91
Outlet Invert	1	20.00	0.0	97.04
Road Elev	1	40.00		100.34
Inlet Culvert Invert	1	60.40	0.0	98.23

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.