Fish Passage Improvement site 20400599

Fish Passage Site 20400599

Coordinates (dec. deg.): 61.46902°, -148.86882°
Legal Description: S016N003E23
Region: South Central
Road Name: Knik River Road

Datum: NAD83
Quad Name / ITM: Anchorage B-5
AWC Stream #: 247-50-10200-2120-3006
Stream Name: Unnamed

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 MSB23-MS005

site photos

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kat Leavitt, Beth Evers

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Inlet perch
Constriction ratio gray
Culvert gradient gray

Comments: Inlet perched at both culverts #1 and #2. Culvert #2 outlet outfall appears to be cascade over boulder.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 121.65

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.625

Condition Rating(1-5): 4

Approach Angle: 0.0

Sedimentation At Inlet: No

Inlet Substrate: Gravel

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	3.8	4.1
Height(ft):	4.0	4.1
Apron Length(ft):
Water Depth(ft):	0.0	1.11
Rustline Height(ft):	0.8
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Embedded Depth(ft): 0.0

Outfall Height: 0.09

Outfall Type: Free Fall In To Pool

Constriction Ratio: 0.57

Culvert Gradient: 5.75%

Max Slope:

Max Slope Length:

Comments: Inlet perched

Culvert Observations:

Inlet perch
Constriction ratio gray
Culvert gradient red

ID: 2

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 121.92

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.625

Condition Rating(1-5): 4

Approach Angle:

Sedimentation At Inlet: No

Inlet Substrate: Gravel

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	4.0	3.4
Height(ft):	3.9	3.8
Apron Length(ft):
Water Depth(ft):		1.12
Rustline Height(ft):	1.0
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: Cascade Over Rip-Rap

Constriction Ratio: 0.57

Culvert Gradient: 5.56%

Max Slope:

Max Slope Length:

Comments: Inlet perched

Culvert Observations:

Inlet perch
Constriction ratio gray
Culvert gradient red

Stream Measurements

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

Stream Slope(deg.):	6.1
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	29.0	5.90
Upstream ordinary high water	54.0	6.50
Upstream ordinary high water	96.0	10.80
Upstream ordinary high water	133.0	7.60

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Relative Elevation (ft)
D/S Thalweg		2.00	67.48
D/S Water Surface Elev		2.00	68.21
D/S Thalweg		8.00	68.90
D/S Water Surface Elev		8.00	69.07
D/S Thalweg		44.30	71.35
D/S Water Surface Elev		44.30	71.78
D/S Thalweg		61.50	72.03
D/S Water Surface Elev		61.50	73.22
D/S Water Surface Elev		65.50	73.79
D/S Thalweg		65.50	73.20
D/S Thalweg		77.90	73.71
D/S Water Surface Elev		77.90	74.39
D/S Water Surface Elev		85.00	74.40
D/S Thalweg		85.00	73.91
D/S Water Surface Elev	1	90.70	75.05
D/S Thalweg	1	90.70	74.68
D/S Water Surface Elev	2	93.00	74.81
D/S Thalweg	2	93.00	74.04
Max Pool Depth	1	94.00	74.59
Outlet Pool Water Elev	1	94.00	75.31
D/S Water Surface Elev	1	100.00	75.40
Outlet Invert	2	100.00	75.95
D/S Water Surface Elev	2	100.00	77.12
Outlet Culvert Top	2	100.00	79.37
Outlet Culvert Top	1	100.00	79.46
Outlet Invert	1	100.00	74.29
Inlet Culvert Invert	2	222.00	82.15
Inlet Culvert Invert	1	222.00	82.44
U/S Water Surface Elev	1	222.00	82.58
U/S Water Surface Elev	2	222.00	82.81
Inlet Culvert Top	2	222.00	86.15
Inlet Culvert Top	1	222.00	86.45
U/S Thalweg	2	225.00	82.76
U/S Thalweg	1	225.00	82.94
U/S Water Surface Elev	1	225.00	83.06
U/S Water Surface Elev	2	225.00	83.11
U/S Water Surface Elev		230.50	83.30
U/S Thalweg		230.50	82.90
U/S Thalweg		237.00	83.40
U/S Water Surface Elev		237.00	83.69
U/S Thalweg		256.00	84.11
U/S Water Surface Elev		256.00	84.48
U/S Water Surface Elev		266.00	84.81
U/S Thalweg		266.00	84.42
U/S Thalweg		278.60	85.38
U/S Water Surface Elev		278.60	85.75
U/S Thalweg		299.00	85.97
U/S Water Surface Elev		299.00	86.34

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.