Road Stream Crossing Site EUP_6337744713
Pine River Watershed, Chub Creek
S Mackinac trail
Chippewa County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.16319086,-84.6110101689999
T 044NN R 002W Sec 31
Fish Passability: Barrier
Perch Height: 1.7 ft.
Total Erosion: 127.31 tons/year
Severity: Severe
Date Inventoried: 6/17/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Square/Rectangle
Inlet Type: Wingwall Greater than 70 degrees
Outlet Type: Freefall into Pool
Structure Material: Concrete
Structure Substrate: Sand
General Conditions: Severe deterioration from corrosion or abrasion (more than 50% of the structure is rusted through) or cracking or spalling or chipping (more than 50% of the structure is compromised). Or Major shape changes (described above) reducing the capacity of the structure by greater than 50%. OR Segment disconnect causing major subsurface erosion/piping and/or partial fill failure and/or sink holes in the fill.
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 120 ft. Width 16 ft. Height 12 ft.
Percentage Plugged: 21% - 40%
Percentage Crushed: None or 0%
Perch Height: 1.7 ft.
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.6 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at 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? Yes
Scour Pool: Length 7 ft., Width 37 ft., Depth 4 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 19 ft.
Wetted Width: 18 ft.
Water Velocity: 0.33 ft./sec. (measured via Float Test)
Dominant Substrate: Clay – very fine particles that stick together
Road Information
Road Surface: Paved
Owner: State
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Width at Culvert: 31 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 50 ft.
Slope: Steep, 1:1, 45°, or 100%
Downstream
Fill Depth: 50 ft.
Slope: Steep, 1:1, 45°, or 100%
Approaches
Left Approach
Length: 300 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.43 tons/year
Right Approach
Length: 520 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.88 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 127.31 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 Upstream Embankment1 | 30 ft. | 20 ft. | 15 ft. | Yes | Clay | Severe (corrective actions recommended) | 126 |
Right Upstream Embankment2 | 12 ft. | 20 ft. | 15 ft. | Yes | Clay | Stabilized (corrective actions recommended) | 0 |
1Wing walls has nearly collapsed due to erosion both up and downstream. Sagging of earth many feet surrounding site as well.
2Wing walls has nearly collapsed due to erosion both up and downstream.
2Wing walls has nearly collapsed due to erosion both up and downstream.
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? Yes, See above.
Were any non-native species observerd at this site? No
Site Comments: Second inlet plugged with debris. Velocity taken thru structure.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.