Fish Passage Improvement site 20401291

Fish Passage Site 20401291

Coordinates (dec. deg.): 61.52220°, -149.52682°
Legal Description: S017N001W31
Region: South Central
Road Name: Surrey Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2012
Stream Name: Cottonwood Slough

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 MSCS1-CT140

site photos

Observers: Edward Weiss, Doug Hill

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year: 2007

Comments: None

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated Metal)

Fish Passage Rating: Red

Length(ft): 40.5

Inlet Type: Projecting

Outlet Type:

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.67

Condition Rating(1-5):

Approach Angle:

Sedimentation At Inlet:

Inlet Substrate: Gravel

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	2.8	4.0
Height(ft):	4.0	4.0
Apron Length(ft):
Water Depth(ft):	0.5	0.48
Rustline Height(ft):
Substrate Depth(ft):	1.2	0.0

Backwatered?:

Baffles Present: No

Embedded?: No

Outfall Height:

Outfall Type: At Stream Grade

Constriction Ratio:

Culvert Gradient: 1.90%

Max Slope:

Max Slope Length:

Culvert Observations:

None of this type

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Gravel	Gravel
Subdominant:

Stream Slope(deg.):
Stream Flow Stage:

No stream width data available.

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Inlet Culvert Top	1			94.11
Outlet Culvert Top	1			94.55
D/S Thalweg (Edge of wetland)		0.00	25.0	89.91
D/S Tailcrest or 1st Thalweg		16.00	9.0	90.53
Outlet Invert	1	25.00	0.0	90.53
Outlet Thalweg	1	25.00	0.0	90.48
Road Elev		45.00		95.05
Road Elev		45.00		95.09
Inlet Culvert Invert	1	65.00	0.0	91.30
Inlet Thalweg	1	65.00	0.0	91.30

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.

Fish Sampling Efforts

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

Photos

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