Road Stream Crossing Site EUP_6336339417
Les Cheneaux Islands Watershed, Unnamed stream
I 75 Bus Loop
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 45.897726472,-84.7355764819999
T 041NN R 003W Sec 31
Fish Passability: Not a Barrier
Structure is NOT Perched
Date Inventoried: 6/12/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30 to 70 degrees
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Moderate deterioration from corrosion or abrasion (small rust flakes or indication that rust is slightly deeper than the surface level) or cracking or spalling or chipping (few minor cracks or localized chipping in the concrete). OR minor shape changes (described above).
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 70 ft. Width 17 ft. Height 5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: 707
Structure is NOT Perched
Structure Inlet
Water Depth: 1.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.27 ft./sec.
Structure Outlet
Water Depth: 2.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.27 ft./sec.
*Water Velocities were measured at the surface (via Float Test).
Stream Information
Stream Flow: > Bankfull – Water has filled the stream channel and is flowing onto the floodplain.
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 2.5 ft.
Bankfull Width: 12 ft.
Wetted Width: 8.8 ft.
Water Velocity: 1.6 ft./sec. (measured via Float Test)
Dominant Substrate: Gravel – rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Paved
Owner: Federal
Road Condition: Impassible, Significant damage to road surface at crossing.
Road Width at Culvert: 40 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 1.7 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 0 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? No
Were any non-native species observerd at this site? No
Site Comments: Owner said it was the highest he has ever seen it
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.