Fish Passage Site 20200944

Coordinates (dec. deg.): 60.14376°, -149.41443°
Legal Description: S001N001W26
Region: South Central
Road Name: Salmon Creek Road

Datum: NAD83
Quad Name / ITM: Seward A-7
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Tributary of Salmon Creek. Marshy on both sides of creek. Above Salmon Creek Rd. culvert.

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 KEN17-17_08

Observers: Jeff Sires, Luke Violette, Louis Mitchell

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year: 2012


Site Observations:

  1. Sediment accumulation
  2. Culvert sagging in middle
  3. Damage associated with ice problems

Comments: KWFRES_17_08. Culvert assessment data collection and photographs submitted by the Kenai Watershed Forum. Both culverts slumping in middle. C1 is main culvert. Downstream tailwater control higher than inverts, backwatering culvert, high flows at time of survey, at lower flows likely lower slow flow through culvert. C2 set higher more as an overflow and inlet invert higher than downstream gradepoint. Unsure is C2 takes flow at all water levels or only higher ones. From notes it does not look like there is substrate throughout culvert anymore if this cuvlert was embedded when replaced. Upstream water surface gradient to railroad track culverts 0.55%, downstream water surface gradient 0.17%.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
 
Length(ft): 72.16
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 8.0
Condition Rating(1-5): 3
Approach Angle: 50.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):18.5 18.5
Height(ft):6.5 4.5
Apron Length(ft):
Water Depth(ft): 2.47
Rustline Height(ft):4.5
Substrate Depth(ft): 2.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.87
Culvert Gradient: 2.16%
Max Slope:
Max Slope Length:
 

Comments: Water surface gradient through culvert 0.11%, substrate gradient through culvert -1.01%.

  Culvert Observations:
  1. Sediment accumulation
  2. Culvert sagging in middle
  3. Damage associated with ice problems
  4. Culvert gradient red
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 68.88
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 2
Approach Angle: 50.0
Sedimentation At Inlet: Yes
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):6.0 6.0
Height(ft):2.75 3.5
Apron Length(ft):
Water Depth(ft): 2.05
Rustline Height(ft):2.75
Substrate Depth(ft):1.33
Backwatered?: Maybe
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: -0.04%
Max Slope:
Max Slope Length:
 

Comments: Substrate depth at outlet not recorded, not sure if there is none. Substrate gradient through culvert 1.58%. Water surface gradient through culvert 0%.

  Culvert Observations:
  1. Sediment accumulation
  2. Culvert sagging in middle
  3. Damage associated with ice problems

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:GravelGravel
Stream Slope(deg.):0.17
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Downstream ordinary high water 30.0 24.50
Downstream ordinary high water 67.0 20.50
Downstream ordinary high water 96.0 23.50
Upstream ordinary high water 23.0 16.00
Upstream ordinary high water 45.0 23.00
Upstream ordinary high water 60.0 24.50

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
Road Elev 98.14
D/S Thalweg (upstream of split in creek) 0.00 91.43
D/S Water Surface Elev 0.00 92.97
D/S Grade Ctrl (Thalweg) (Large log) 15.00 90.33
D/S Water Surface Elev 15.00 92.92
D/S Thalweg 45.00 91.02
D/S Water Surface Elev 45.00 93.10
D/S Thalweg (Stream begins to form channel from outlet pool here) 93.00 91.62
D/S Water Surface Elev 93.00 93.13
Max Pool Depth 1 120.00 90.67
Outlet Pool Water Elev 1 120.00 93.10
Max Pool Depth 2 121.00 90.70
Outlet Pool Water Elev 2 121.00 93.07
Outlet Culvert Top 1 121.00 95.20
D/S Water Surface Elev 1 121.00 93.13
Outlet Invert (measured on top of rib corrugation) 1 121.00 90.66
Outlet Culvert Top 2 125.00 94.92
D/S Water Surface Elev 2 125.00 93.18
Outlet Invert 2 125.00 91.13
Inlet Culvert Top 2 193.15 94.89
Split into USWS and DSWS 2 193.15 93.07
Inlet Culvert Invert 2 193.15 92.22
Inlet Culvert Top (measured on top of rib corrugation) 1 193.15 96.58
Split into USWS and DSWS 1 193.15 93.21
Inlet Culvert Invert 1 193.15 89.93
U/S Thalweg (inlet pool) 2 198.15 92.07
Split into USWS and DSWS 2 198.15 93.19
U/S Thalweg (inlet pool) 1 198.15 90.71
Split into USWS and DSWS 1 198.15 93.19
U/S Grade Ctrl (Thalweg) (Riffle over rip rap) 243.15 92.29
Split into USWS and DSWS 243.15 93.47
U/S Thalweg 273.15 91.37
Split into USWS and DSWS 273.15 93.87
U/S Thalweg 298.15 89.90
Split into USWS and DSWS 298.15 93.80
U/S Thalweg (at outlet of upstream culvert under railroad) 313.15 90.59
Split into USWS and DSWS 313.15 93.82

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Minnow Trap (A) Trap Duration(h): 2.0
Comments: Trap set about 100 feet upstream.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 2.0
Comments: Trap set about 32 feet downstream.

Fish Observations

No fish observations occurred during this survey.

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