Road Stream Crossing Site EUP_41N4W23_001
Les Cheneaux Islands Watershed, Rabbit Back Creek
Hay Lake
Mackinac County
Information collected by:
HNF USFS
Site Location
GPS Coordinates: 45.9298531760001,-84.7652823399999
T 041NN R 004W Sec 23
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Overall Score: 25
Severity: Moderate
Date Inventoried: 5/17/2018
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 2
Structure Shape: Native Bottom Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Concrete
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.
Additional (Multiple) Structures | ||||
Structure | Width | Length | Height | Material |
2 | 5.9 ft. | 33.3 ft. | 4.25 ft. | Metal |
Structure Interior: Corrugated
Is Structure Rusted through? Yes
Dimensions of Structure: Length 33.3 ft. Width 5.9 ft. Height 4.25 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.23 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.98 ft./sec.
Structure Outlet
Water Depth: 1.1 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 – Water has completely filled the stream channel, but is not flowing onto the floodplain.
Is Scour Pool Present? Yes
Scour Pool: Length 29.7 ft., Width 25.5 ft., Depth 0 ft.
Riffle Information
Water Depth: 2.13 ft.
Bankfull Width: 22.4 ft.
Wetted Width: 11.7 ft.
Water Velocity: 1.28 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: Federal
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Width at Culvert: 11.6 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 9.1 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 11.65 ft.
Approaches
Left Approach
Length: 900 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Right Approach
Length: 200 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Information
Summary Information
Fish Passability: Barrier at High Flows
Site Comments: Ditches.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.