Road Stream Crossing Site EUP_MCW07
Les Cheneaux Islands Watershed, Law Creek
Hwy 134
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.0135677980001,-84.459392352
T 042N R 001 Sec 29
Fish Passability: Not a Barrier
Structure is NOT Perched
Total Erosion: 0.12 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
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Sand
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 68 ft. Width 7 ft. Height 4.5 ft.
Percentage Plugged: 1% - 20% Inlet
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.1 ft./sec.
Structure Outlet
Water Depth: 1.3 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.4 ft./sec.
*Water Velocities were measured 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? Yes
Pond: Length 5 ft., Width 10 ft.
Riffle Information
Water Depth: 1.4 ft.
Bankfull Width: 9 ft.
Wetted Width: 6.7 ft.
Water Velocity: 0.2 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: 38 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.77 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 2.2 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 2000 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.06 tons/year
Right Approach
Length: 2500 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.06 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.12 tons/year
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? Yes, Spotted knapweed.
Site Comments: Trash rack covered
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.