Road Stream Crossing Site EUP_6336590844
Carp River Watershed, South branch carp river
Ozark trail
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.090634423,-85.009215028
T 043NN R 006W Sec 26
Fish Passability: Not a Barrier
Structure is NOT Perched
Total Erosion: 1.49 tons/year
Overall Score: 19
Severity: Moderate
Date Inventoried: 4/6/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Site Sketch
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30 to 70 degrees
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: Sand
General Conditions: Major deterioration from corrosion or abrasion (5-10% of the structure is rusted through) or cracking or spalling or chipping (medium sized cracks, widespread chipping, exposed metal reinforcement). OR Major shape changes (described above) reducing the capacity of the structure by less than 30%. OR segment disconnection (segments of concrete or metal culvert disconnecting internally) but no evidence of water piping.
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 12 ft. Width 31 ft. Height 8 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.5 ft./sec.
Structure Outlet
Water Depth: 2.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1 ft./sec.
*Water Velocities were measured 2.6 ft. below the surface (via Flow Meter).
Additional Comments
Updated by Huron Pines
Stream Information
Stream Flow: < Bankfull – The stream channel is more than half filled with water, but is not full.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 1.5 ft.
Bankfull Width: 24 ft.
Wetted Width: 20 ft.
Water Velocity: 0.83 ft./sec. (measured via Float Test)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Sand
Owner: Federal
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Core Integrity: Poor (one or more symptoms are present and are compromising the integrity of the crossing)
Road Width at Culvert: 12 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90°
Downstream
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90°
Approaches
Left Approach
Length: 300 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.46 tons/year
Right Approach
Length: 600 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 1.03 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.49 tons/year
Summary Information
Fish Passability: Not a Barrier
Is a future visit to this site recommended? Yes, Bridge is rotting and could be dangerous for future.
Were any non-native species observerd at this site? Yes, Spotted knapweed.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.