Road Stream Crossing Site EUP_6372756003
Les Cheneaux Islands Watershed, Unnamed Stream
Unnamed Road/ORV Trail
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 45.945123746,-84.799261847
T 041NN R 004W Sec 15
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Date Inventoried: 6/13/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Severe deterioration from corrosion or abrasion (more than 50% of the structure is rusted through) or cracking or spalling or chipping (more than 50% of the structure is compromised). Or Major shape changes (described above) reducing the capacity of the structure by greater than 50%. OR Segment disconnect causing major subsurface erosion/piping and/or partial fill failure and/or sink holes in the fill.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 16 ft. Width 2 ft. Height 2 ft.
Percentage Plugged: 81% - 100%
Percentage Crushed: 41% - 60%
Structure is NOT Perched
Structure Inlet
Water Depth: 0 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0 ft.
Embedded Depth of Structure: 1 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the surface (via Float Test).
Stream Information
Stream Flow: = Bankfull – Water has completely filled the stream channel, but is not flowing onto the floodplain.
Is Scour Pool Present? No
Is Upstream Ponding Present? Yes
Pond: Length 120 ft., Width 30 ft.
Riffle Information
Water Depth: 0 ft.
Bankfull Width: 0 ft.
Wetted Width: 0 ft.
Water Velocity: 0 ft./sec.
Road Information
Road Surface: Gravel
Owner: Other
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Width at Culvert: 9.7 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 0 ft.
Downstream
Fill Depth: 0.6 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0 tons/year
Right Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0 tons/year
Erosion Information
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? Yes, Inlet of culvert is not visible, looks like it is crushed in/gone. Water flow through the culvert is extremely impeded other than some minor seepage. Pond level on inlet side is much higher than outlet side. This culvert is meant to drain a swampy area on either side of the ORV trail.
Were any non-native species observerd at this site? No
Site Comments: Extremely poor culvert. See future visit comment.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.