Road Stream Crossing Site EUP_MCW20
Les Cheneaux Islands Watershed, Flowers Creek
Hwy 134
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.0002913,-84.3228793
T 042N R 001 Sec 29
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 1.44 tons/year
Overall Score: 27
Severity: Moderate
Date Inventoried: 5/14/2021
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 and Wingwall
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Gravel
General Conditions: Not new, but no noticeable corrosion, abrasion, chipping, spalling, or cracking. No shape changes such as barrel distortion (bowing, bending, warping), bulging, inlet or outlet damaged.
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 52 ft. Width 4 ft. Height 4 ft.
Percentage Plugged: 1% - 20% Inlet
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.7 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.6 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? Yes
Scour Pool: Length 50 ft., Width 28 ft., Depth 3.5 ft.
Is Upstream Ponding Present? Yes
Pond: Length 9 ft., Width 12 ft.
Riffle Information
Water Depth: 0.7 ft.
Bankfull Width: 17 ft.
Wetted Width: 10.6 ft.
Water Velocity: 1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Clay – very fine particles that stick together
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: 2.2 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Downstream
Fill Depth: 3 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 4000 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.72 tons/year
Right Approach
Length: 2500 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.72 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.44 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? No
Site Comments: Undersized culvert
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.