Road Stream Crossing Site EUP_6336775762
Carp River Watershed, North Branch Carp River
Kenneth road (FR 3122)
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 46.1005241060001,-84.852506798
T 043NN R 004W Sec 19
Owned by Federal, Private
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 1.08 tons/year
Date Inventoried: 6/9/2020
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Other
Outlet Type: Other
Structure Material: Wood
Structure Substrate: Rock
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).
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 15.8 ft. Width 27 ft. Height 8 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.8 ft./sec.
*Water Velocities were measured at the surface (via Float Test).
Stream Information
Stream Flow: < 1/2 Bankfull – The stream channel is less than half filled with water.
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: 2 ft.
Bankfull Width: 22 ft.
Wetted Width: 19 ft.
Water Velocity: 2.5 ft./sec. (measured via Float Test)
Dominant Substrate: Cobble – baseball-sized or larger rocks (10in)
Road Information
Road Surface: Gravel
Owner: Federal
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Width at Culvert: 14 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
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: 335 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.06 tons/year
Right Approach
Length: 400 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.93 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.08 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) | ||
Right Downstream Embankment1 | 6 ft. | 5 ft. | 3 ft. | No | Sandy Loam | Minor | 0.09 |
1Previous erosion site settling in, no measures to be taken.
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: Velocity taken thru bridge.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.