Fish Passage Site 20501436

Coordinates (dec. deg.): 61.56963°, -149.84109°
Legal Description: S017N003W16
Region: South Central
Road Name: Beaver Lake Road

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #: 247-50-10330-2050-3019-4011-5011
Stream Name: Lynda Lake Portage

Elevation:

Site Comments: SUSITNA RIVER 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 MSB23-MS097

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Beaver Activity
  2. Mechanical damage or joints parting
  3. Structural Problem

Comments: Beaver gate at inlet (not attached) not in water. Small stream/ channel flows from outlet to pond.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 59.16
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Organic
Outlet Substrate: Gravel
InletOutlet
Width(ft):2.6 2.76
Height(ft):3.1 3.03
Apron Length(ft):
Water Depth(ft):0.0 0.07
Rustline Height(ft):2.2
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.19
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 1.64%
Max Slope:
Max Slope Length:
 

Comments: Outlet has rusted out holes in bottom. Rusted out pipe is 3ft into pipe from mouth of outlet, carving away fill surrounding outlet and creating larger stream/ pond at outlet. Culvert sagging in the middle.
  Culvert Observations:
  1. Beaver Activity
  2. Mechanical damage or joints parting
  3. Structural Problem

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):2.36
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Water Surface Elev 93.84
Inlet Culvert Top 0.00 95.41
U/S Water Surface Elev (Culvert water surface) 0.00 93.71
Inlet Culvert Invert 0.00 92.43
Outlet Invert 59.16 92.67
D/S Water Surface Elev 59.16 92.74
Outlet Culvert Top 59.16 95.67
D/S Water Surface Elev 60.16 92.55
D/S Thalweg 60.16 92.17
D/S Thalweg 71.16 91.66
D/S Water Surface Elev 71.76 92.18
D/S Thalweg 102.19 90.20
D/S Water Surface Elev 102.19 91.47
D/S Thalweg 124.16 89.22
D/S Water Surface Elev 124.16 90.89

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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