Road Stream Crossing Site EUP_MCW11
Les Cheneaux Islands Watershed, Pearson Creek
N. Blindline Rd
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.0110614,-84.3732417
T 042N R 001 Sec 25
Fish Passability: Barrier
Perch Height: 0.6 ft.
Overall Score: 32
Severity: Severe
Date Inventoried: 5/13/2021
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Pipe Arch
Inlet Type: Projecting
Outlet Type: Cascade Over Riprap
Structure Material: Metal
Structure Substrate: None
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 50 ft. Width 4.5 ft. Height 3.3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: 41% - 60%
Perch Height: 0.6 ft.
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.9 ft./sec.
*Water Velocities were measured 0.1 ft. below the surface (via Flow Meter).
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? Yes
Pond: Length 6 ft., Width 15 ft.
Riffle Information
Water Depth: 0.9 ft.
Bankfull Width: 9.7 ft.
Wetted Width: 8 ft.
Water Velocity: 0.5 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Gravel
Owner: County
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Core Integrity: Good (no symptoms of lack of integrity)
Road Width at Culvert: 24 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 3.7 ft.
Slope: Gentle, 3:1, 15°, or 33%
Erosion Information
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: Crushed/undersized culvert, suckers observed on downstream end
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.