Road Stream Crossing Site EUP_MCW13
Les Cheneaux Islands Watershed, Flowers Creek
Meridian Road
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.0291326,-84.3629086
T 042N R 001 Sec 18
Fish Passability: Barrier
Perch Height: 0.2 ft.
Total Erosion: 0.79 tons/year
Overall Score: 22
Severity: Severe
Date Inventoried: 5/13/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Square/Rectangle
Inlet Type: Headwall
Outlet Type: Freefall onto Riprap
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Light superficial corrosion or abrasion or chipping or spalling or cracking. No shape changes (described above).
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 80 ft. Width 8.5 ft. Height 5.2 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Perch Height: 0.2 ft.
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.6 ft./sec.
Structure Outlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.5 ft./sec.
*Water Velocities were measured 0.1 ft. below the surface (via Flow Meter).
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? Yes
Scour Pool: Length 8 ft., Width 5 ft., Depth 1.2 ft.
Is Upstream Ponding Present? Yes
Pond: Length 5 ft., Width 10 ft.
Riffle Information
Water Depth: 0.6 ft.
Bankfull Width: 10 ft.
Wetted Width: 6 ft.
Water Velocity: 0.5 ft./sec. (measured via Flow Meter)
Dominant Substrate: Gravel – rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Paved
Owner: County
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: 44 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 4.8 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 4 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 960 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.79 tons/year
Right Approach
Length: 0 ft.
Slope: 1-5%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 0 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.79 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Spottted knapweed.
Site Comments: Poor alignment
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.