Fish Passage Site 20300942

Coordinates (dec. deg.): 60.64325°, -149.49758°
Legal Description: S006N001W05
Region: South Central
Road Name: Seward Highway

Datum: NAD83
Quad Name / ITM: Seward C-7
AWC Stream #:
Stream Name: Colorado Creek

Elevation:

Site Comments: None

Survey Date: Aug 30, 2001

Survey KPCS1-EK058

Observers: Cecil Rich, William Glick, James Maple

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Agradation in left culvert has diverted flow to far right bank causing inlet erosion. No water in left culvert.

Culvert Measurements

ID: 1 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 73.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Cobble
Outlet Substrate: Boulder
InletOutlet
Width(ft):9.2 9.15
Height(ft):
Apron Length(ft):
Water Depth(ft):0.0 0.0
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.36
Outfall Type:
Constriction Ratio: 1.31
Culvert Gradient:
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Sediment accumulation
ID: 2 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 73.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.2 9.15
Height(ft):5.16 6.58
Apron Length(ft):
Water Depth(ft):1.71 0.96
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.36
Outfall Type:
Constriction Ratio: 1.31
Culvert Gradient:
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type
ID: 3 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 73.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.0 9.2
Height(ft):5.82 6.77
Apron Length(ft):
Water Depth(ft):1.71 0.88
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.36
Outfall Type:
Constriction Ratio: 1.31
Culvert Gradient:
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:BoulderBoulder
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 16.7 26.00
Downstream ordinary high water 50.0 12.70
Downstream ordinary high water 90.0 13.00
Upstream ordinary high water 5.0 49.50
Upstream ordinary high water 50.0 25.70
Upstream ordinary high water 100.0 16.20

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg 0.00 90.0 85.79
D/S OHW Elev 0.00 90.0 87.04
D/S Water Surface Elev 0.00 90.0 87.25
D/S Water Surface Elev 40.00 50.0 87.33
D/S OHW Elev 40.00 50.0 87.12
D/S Thalweg 40.00 50.0 85.83
D/S Tailcrest or 1st Thalweg 73.30 16.7 87.77
D/S Water Surface Elev 73.30 16.7 88.98
OHW Left Bank 73.30 16.7 89.75
OHW Left Bank 85.00 5.0 89.79
OHW Left Bank 85.00 5.0 89.17
Max Pool Depth 85.00 5.0 87.42
D/S Thalweg 85.00 5.0 87.42
Outlet Thalweg 1 90.00 0.0 89.31
Outlet Rustline Height 1 90.00 0.0 89.65
Outlet Invert 3 90.00 0.0 88.65
Outlet Thalweg 3 90.00 0.0 88.65
Outlet Invert 2 90.00 0.0 88.79
Outlet Thalweg 2 90.00 0.0 88.79
Outlet Rustline Height 3 90.00 0.0 89.90
Outlet Rustline Height 2 90.00 0.0 89.96
Outlet Culvert Top 1 90.00 0.0 95.29
Outlet Culvert Top 2 90.00 0.0 95.37
Outlet Culvert Top 3 90.00 0.0 95.42
Road Elev 126.50 97.58
Road Elev 126.50 97.67
Inlet Culvert Top 1 163.00 0.0 95.48
Inlet Culvert Top 2 163.00 0.0 95.56
Inlet Culvert Top 3 163.00 0.0 95.63
Inlet Rustline Height 1 163.00 0.0 91.92
Inlet Rustline Height 2 163.00 0.0 91.96
Inlet Thalweg 1 163.00 0.0 93.02
Inlet Thalweg 3 163.00 0.0 89.81
Inlet Thalweg 2 163.00 0.0 90.40
Inlet Rustline Height 3 163.00 0.0 91.08
U/S Thalweg 2 164.00 1.0 91.65
U/S Thalweg 3 164.00 1.0 89.98
U/S Thalweg 2 168.00 5.0 91.69
U/S Thalweg 3 168.00 5.0 91.50
U/S OHW elevation 1 168.00 5.0 93.21
U/S Water Surface Elev 2 168.00 5.0 93.92
U/S Thalweg 3 181.20 18.2 93.69
U/S Thalweg 1 181.35 18.35 93.44
U/S Thalweg 2 181.35 18.35 93.52
U/S Water Surface Elev 213.00 50.0 95.44
U/S Thalweg 213.00 50.0 94.58
U/S Headwater 213.00 50.0 94.94
U/S Thalweg 263.00 100.0 95.73
U/S Headwater 263.00 100.0 96.94
U/S Water Surface Elev 263.00 100.0 97.19

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): 2.15
 
Gear Type: Minnow Trap (B) Trap Duration(h): 2.15

Fish Observations

Species: juvenile Dolly Varden Life History: Resident
Total Fish Observed: 10 Fish Measured: 5 Fork Lengths (mm) Min: 102 Max: 151 Mean: 123
Collected/Observed by Gear Type: Downstream Minnow Trap (6)  Upstream Minnow Trap (4)  
 
Species: juvenile rainbow trout Life History: Resident
Total Fish Observed: 2 Fish Measured: 1 Fork Lengths (mm) Min: 105 Max: 105 Mean: 105
Collected/Observed by Gear Type: Downstream Minnow Trap (2)  

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