Road Stream Crossing Site EUP_6336338953
Les Cheneaux Islands Watershed, Unnamed river
Town Line Rd.
Mackinac County
Information collected by:
Superior Watershed Partnership
Site Location
GPS Coordinates: 45.8972037350001,-84.7359229899999
T 041NN R 003W Sec 31
Fish Passability: Not a Barrier
Structure is NOT Perched
Total Erosion: 0.03 tons/year
Date Inventoried: 6/12/2020
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Pipe Arch
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
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: Corrugated
Is Structure Rusted through? Yes
Dimensions of Structure: Length 37.5 ft. Width 9.8 ft. Height 6 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.2 ft./sec.
Structure Outlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 1.2 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? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 2.5 ft.
Bankfull Width: 12 ft.
Wetted Width: 8.8 ft.
Water Velocity: 1.6 ft./sec. (measured via Float Test)
Dominant Substrate: Gravel – rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Paved
Owner: Township
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Width at Culvert: 20.5 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 0.2 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 0.4 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 120 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.03 tons/year
Right Approach
Length: 0 ft.
Slope: 1-5%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 0 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.03 tons/year
Summary Information
Fish Passability: Not a Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.