Road Stream Crossing Site EUP_42N2W16_001
Les Cheneaux Islands Watershed, Nunns Creek
Spur 1127A
Mackinac County
Information collected by:
HNF USFS
Site Location
GPS Coordinates: 46.0424458030001,-84.562378592
T 042NN R 002W Sec 16
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Overall Score: 7
Severity: Minor
Date Inventoried: 8/19/2018
Crossing Information*
Type of Crossing: Bridge
Structure Material: Wood
Structure Substrate: Mixture
Dimensions of Structure: Length 35.5 ft. Width 13.2 ft. Height 3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.73 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0.72 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Riffle Information
Water Depth: 0.53 ft.
Bankfull Width: 18.6 ft.
Wetted Width: 16.4 ft.
Water Velocity: 0 ft./sec. (measured via Float Test)
Dominant Substrate: Cobble – baseball-sized or larger rocks (10in)
Road Information
Road Surface: Native Surface
Owner: Federal
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Runoff Path: Ditch
Approaches
Left Approach
Length: 50 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Right Approach
Length: 150 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Information
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Extent of Erosion | Estimated Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | ||
Left Downstream Streambank | 6 ft. | 0 ft. | 2 ft. | Yes | Sandy Loam | Moderate (corrective actions recommended) | |
Left Upstreram Streambank | 15 ft. | 0 ft. | 2.5 ft. | Yes | Sandy Loam | Moderate (corrective actions recommended) | |
Summary Information
Fish Passability: Barrier at High Flows
Site Comments: Erosion control
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.