Road Stream Crossing Site EUP_6372730129
Les Cheneaux Islands Watershed, Summerby creek
State hwy 123
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 45.9691150580001,-84.78909024
T 041NN R 004W Sec 10
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.49 tons/year
Date Inventoried: 6/11/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Wingwall 10 to 30 degrees
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Sand
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 72 ft. Width 5 ft. Height 5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.7 ft.
Embedded Depth of Structure: 2.5 ft.
Water Velocity*: 1.14 ft./sec.
Structure Outlet
Water Depth: 1.3 ft.
Embedded Depth of Structure: 2 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured 1.3 ft. below 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? No
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 10 ft.
Wetted Width: 9 ft.
Water Velocity: 1 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: State
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Width at Culvert: 32 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 300 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.02 tons/year
Right Approach
Length: 800 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.47 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.49 tons/year
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: River velocity taken thru structure.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.