Fish Passage Site 20400763

Coordinates (dec. deg.): 61.07595°, -149.82972°
Legal Description: S011N003W04
Region: South Central
Road Name: Seward Highway

Datum: NAD83
Quad Name / ITM: Anchorage A-8
AWC Stream #: 247-60-10320
Stream Name: Rabbit Creek

Elevation:

Site Comments: In 1990 the AK Railroad installed a series of step pools below the culverts/tidegates to raise the water level approx 18". The rock weirs were built by hand and were originally intended to be a temporary solution. As of 2011 they are still in place although they have somewhat collapsed. The tidegates on the culverts were reomved in 2010.

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 ANC04-3A159

Observers: Dean Beers, Vic Stanculescu

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: RABBIT CREEK WATERSHED, FISH LIKELY ONLY GETTING PAST CENTER CULVERT DUE TO COVERS AT OUTLET(SEE PICS), ADULT COHO ABOVE AND BELOW CULVERTS. NO UPSTREAM MEASUREMENTS DUE TO POTTER MARSH.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 143.4
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 1
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):4.7
Height(ft):5.1
Apron Length(ft):
Water Depth(ft): 0.0
Rustline Height(ft):2.9
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.62
Outfall Type:
Constriction Ratio:
Culvert Gradient: 1.19%
Max Slope:
Max Slope Length:
ID: 2 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 143.4
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):4.8
Height(ft):5.1
Apron Length(ft):
Water Depth(ft): 0.9
Rustline Height(ft):2.9
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.62
Outfall Type:
Constriction Ratio:
Culvert Gradient: 0.96%
Max Slope:
Max Slope Length:
ID: 3 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating:
 
Length(ft): 143.4
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate:
Outlet Substrate:
InletOutlet
Width(ft):4.8
Height(ft):5.0
Apron Length(ft):
Water Depth(ft): 0.3
Rustline Height(ft):2.9
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.62
Outfall Type:
Constriction Ratio:
Culvert Gradient: 1.33%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:
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)
Max Pool Depth 88.02
D/S Thalweg 88.02
D/S Tailcrest or 1st Thalweg 88.87
OHW Left Bank 89.86
OHW Left Bank 90.99
U/S Thalweg 1 91.16
U/S Thalweg 2 91.16
U/S Thalweg 3 91.16
Outlet Invert 1 0.00 0.0 90.18
Outlet Invert 3 0.00 0.0 90.18
Outlet Invert 2 0.00 0.0 90.41
Road Elev 71.50 100.27
Inlet Culvert Invert 2 143.00 0.0 91.78
Inlet Culvert Invert 1 143.00 0.0 91.89
Inlet Culvert Invert 3 143.00 0.0 92.09

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: Visual Observation, Ground (A)

Fish Observations

No fish observations occurred during this survey.

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