Road Stream Crossing Site EUP_6336756528
Carp River Watershed, Carp River
St Ignace to trout lk trl
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.058474528,-84.896413469
T 042NN R 005W Sec 02
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Total Erosion: 1.39 tons/year
Date Inventoried: 6/11/2020
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Material: Wood
Structure Substrate: Sand
General Conditions: Moderate deterioration from corrosion or abrasion (small rust flakes or indication that rust is slightly deeper than the surface level) or cracking or spalling or chipping (few minor cracks or localized chipping in the concrete). OR minor shape changes (described above).
Is Structure Rusted through? No
Dimensions of Structure: Length 14.8 ft. Width 105 ft. Height 13.5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 5.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.11 ft./sec.
Structure Outlet
Water Depth: 5.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.11 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 18 ft., Width 4 ft., Depth 2 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 5.5 ft.
Bankfull Width: 35 ft.
Wetted Width: 30 ft.
Water Velocity: 1.25 ft./sec. (measured via Float Test)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Gravel
Owner: Other
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Width at Culvert: 12 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0 ft.
Downstream
Fill Depth: 0 ft.
Approaches
Left Approach
Length: 471 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.77 tons/year
Right Approach
Length: 391 ft.
Slope: 1-5%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.62 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.39 tons/year
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? Yes, To judge if riprap or bank armouring for scour pool is needed.
Were any non-native species observerd at this site? No
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.