Road Stream Crossing Site EUP_6372829270
Les Cheneaux Islands Watershed, Rabbit Back Creek
Mackinac Trail
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 45.91973668,-84.734405027
T 041NN R 003W Sec 30
Fish Passability: Not a Barrier
Structure is NOT Perched
Date Inventoried: 6/13/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 10 to 30 degrees
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Major deterioration from corrosion or abrasion (5-10% of the structure is rusted through) or cracking or spalling or chipping (medium sized cracks, widespread chipping, exposed metal reinforcement). OR Major shape changes (described above) reducing the capacity of the structure by less than 30%. OR segment disconnection (segments of concrete or metal culvert disconnecting internally) but no evidence of water piping.
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 42.2 ft. Width 23.5 ft. Height 5.3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 1.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the surface (via Float Test).
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0 ft.
Bankfull Width: 0 ft.
Wetted Width: 0 ft.
Water Velocity: 0 ft./sec.
Road Information
Road Surface: Paved
Owner: County
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Width at Culvert: 32 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 0.4 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Right Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Erosion Information
Summary Information
Fish Passability: Not a Barrier
Is a future visit to this site recommended? Yes, Structure is deteriorating, stream condition is questionable.
Were any non-native species observerd at this site? Yes, Spotted Knapweed.
Site Comments: There is exposed rebar on the inlet left side
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.