Road Stream Crossing Site EUP_6336634625
Carp River Watershed, Unnamed stream
Town line Rd
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.081521493,-84.992199597
T 043NN R 006W Sec 36
Fish Passability: Not a Barrier
Structure is NOT Perched
Total Erosion: 4.87 tons/year
Date Inventoried: 6/10/2020
Crossing Information*
Type of Crossing: Ford
Number of Structures: 1
Inlet Type: Other
Outlet Type: Other
Structure Material: Other
Structure Substrate: Sand
Structure Interior: Other
Is Structure Rusted through? No
Dimensions of Structure: Length 15 ft. Width 10.1 ft. Height 0 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.83 ft./sec.
Structure Outlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.83 ft./sec.
*Water Velocities were measured 0.6 ft. below the surface (via Float Test).
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 12 ft.
Wetted Width: 10 ft.
Water Velocity: 1 ft./sec. (measured via Float Test)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Native Surface
Owner: Other
Road Condition: Broken Pavement or Rilled/Gullied, Multiple patches, cracks, rilling, or gullies at crossing.
Road Width at Culvert: 10.1 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 0 ft.
Downstream
Fill Depth: 0 ft.
Approaches
Left Approach
Length: 60 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.14 tons/year
Right Approach
Length: 50 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.11 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 4.87 tons/year
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Extent of Erosion | Estimated Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | ||
Left Approach | 10 ft. | 10 ft. | 3 ft. | Yes | Sand | Moderate (corrective actions recommended) | 2.31 |
Right Approach | 15 ft. | 10 ft. | 2 ft. | Yes | Sand | Moderate (corrective actions recommended) | 2.31 |
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 along trail.
Site Comments: There is evidence of an old rotten wood bridge slightly upstream of ford. One log is placed along entrance of ford to prevent erosion, but significant amounts of sand are entering the stream from both sides.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.