Fish Passage Improvement site 20400050

Fish Passage Site 20400050

Coordinates (dec. deg.): 61.18899°, -149.82399°
Legal Description: S013N003W28
Region: South Central
Road Name: Providence Drive

Datum: NAD83
Quad Name / ITM: Anchorage A-8
AWC Stream #: 247-50-10050
Stream Name: Chester Creek South Fork

Elevation:

Site Comments: CHESTER CREEK 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 UPD21-PRV01

site photos

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kim Clark, Michael Mazzacavallo

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2019

Comments: 2 storm drains and confluences just below the outlet. Mid-channel gravel bar at inlet, thalweg splits.

Culvert Measurements

ID: 1

Structure Type: Open-bottom arch (Reinforced concrete)

Fish Passage Rating: Green

Length(ft): 152.2

Inlet Type: Headwall

Outlet Type: Headwall

Corrugation Depth(in.):

Corrugation Width(in.):

Condition Rating(1-5): 5

Approach Angle: 0.0

Sedimentation At Inlet: No

Inlet Substrate: Gravel

Outlet Substrate: Cobble

	Inlet	Outlet
Width(ft):	19.85	19.6
Height(ft):	4.04	4.91
Apron Length(ft):
Water Depth(ft):		1.31
Rustline Height(ft):
Substrate Depth(ft):

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.15

Culvert Gradient: 0.49%

Max Slope:

Max Slope Length:

Comments: Opened bottom arch. No corrugations.

Stream Measurements

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

Stream Slope(deg.):	0.48
Stream Flow Stage:	High

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	156.4	14.94
Downstream ordinary high water	223.4	17.77
Downstream ordinary high water	230.4	18.43

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev (Road Surface)		99.90
D/S Thalweg	0.00	89.82
D/S Water Surface Elev	0.00	91.35
D/S Water Surface Elev	31.00	91.50
D/S Thalweg (bottom of riffle)	31.00	90.60
Outlet Culvert Top	60.00	95.27
D/S Water Surface Elev	60.00	91.79
Outlet Invert	60.00	90.48
Inlet Culvert Invert	205.20	91.47
Inlet Culvert Top	205.20	96.02
U/S Water Surface Elev	205.20	92.25
U/S Water Surface Elev	231.20	92.64
U/S Thalweg	231.20	92.05
U/S Thalweg	250.20	91.63
U/S Water Surface Elev	250.20	92.89
U/S Water Surface Elev	265.20	93.15
U/S Thalweg	265.20	92.59

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

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov