Road Stream Crossing Site EUP_Hessel 2
Les Cheneaux Islands Watershed, Unknown
Forest Access Road
Mackinac County
Information collected by:
MiDNR
Site Location
GPS Coordinates: 46.0345745,-84.4465911
T 042N R 001 Sec 16
Fish Passability: Barrier at High Flows
Total Erosion: 0.04 tons/year
Overall Score: 17
Severity: Moderate
Date Inventoried: 10/28/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Plastic
Structure Substrate: None
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 20 ft. Width 1 ft. Height 1 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure Inlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0.5 ft.
Water Velocity*: 0.6 ft./sec.
Structure Outlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.6 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.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? Yes
Scour Pool: Length 6 ft., Width 2 ft., Depth 0.5 ft.
Is Upstream Ponding Present? No
Riffle Information
Road Information
Road Surface: Sand
Owner: State
Manager: DNR Forest Resources Division
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Core Integrity: Fair (some of the symptoms may be present, but not to an extent posing high risk to the crossing)
Road Width at Culvert: 8 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0.5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 0.5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 20 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.01 tons/year
Right Approach
Length: 40 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.03 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.04 tons/year
Summary Information
Fish Passability: Barrier at High Flows
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.