Road Stream Crossing Site EUP_MCW10
Les Cheneaux Islands Watershed, Pearson Creek
W. State Ave
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.0062571,-84.3706359
T 042N R 001 Sec 25
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Total Erosion: 0.07 tons/year
Overall Score: 12
Severity: Minor
Date Inventoried: 5/13/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Other
Other
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Pipe Arch
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Rock
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 72 ft. Width 9.5 ft. Height 4.2 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*: 0.2 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2 ft./sec.
*Water Velocities were measured 0.1 ft. below the surface (via Flow Meter).
Stream Information
Stream Flow: < 1/2 Bankfull – The stream channel is less than half filled with water.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.6 ft.
Bankfull Width: 11 ft.
Wetted Width: 7.5 ft.
Water Velocity: 0.5 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Paved
Owner: State
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Core Integrity: Good (no symptoms of lack of integrity)
Road Width at Culvert: 22 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.7 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 1.8 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 1968 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.04 tons/year
Right Approach
Length: 627 ft.
Slope: < 1%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 0.03 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.07 tons/year
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Mullein.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.