Road Stream Crossing Site PIGN_PR11

Pigeon River Watershed, Unnamed
Grass lake Rd
Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.1913988,-84.4481699
T 032N R 001 Sec 05
Fish Passability: Barrier
Perch Height: 0.9 ft.
Total Erosion: 1.62 tons/year
Overall Score: 37
Severity: Severe
Date Inventoried: 9/8/2021
Road Approach - Left
Road Approach - Left
Road Approach - Right
Road Approach - Right
Upstream Conditions
Upstream Conditions
Downstream Conditions
Downstream Conditions
Representative Reach
Representative Reach
Site Sketch
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: Freefall into Pool
Structure Material: Plastic
Structure Substrate: None
General Conditions: Light superficial corrosion or abrasion or chipping or spalling or cracking. No shape changes (described above).
Structure Interior: Smooth
Is Structure Rusted through? No
Dimensions of Structure: Length 38 ft. Width 1.5 ft. Height 1.5 ft.
Percentage Plugged: 81% - 100% Inlet
Percentage Crushed: None or 0%
Perch Height: 0.9 ft.
Structure Inlet
Water Depth: 1.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.1 ft./sec.
Structure Outlet
Water Depth: 0.1 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.7 ft./sec.
*Water Velocities were measured 0.1 ft. below the surface (via Flow Meter).
Stream Information
Stream Flow: = Bankfull Water has completely filled the stream channel, but is not flowing onto the floodplain.
Stream Flow Type: Perennial (if flowing during the time of assessment.)
Is Scour Pool Present? Yes
Scour Pool: Length 5 ft., Width 5 ft., Depth 0.7 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 3.8 ft.
Wetted Width: 2.7 ft.
Water Velocity: 0.4 ft./sec. (measured via Flow Meter)
Dominant Substrate: Organics decomposing plant material
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: Fair (some of the symptoms may be present, but not to an extent posing high risk to the crossing)
Road Width at Culvert: 14 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 1 ft.
Slope: Gentle, 3:1, 15, or 33%
Fill Depth: 2.2 ft.
Slope: Gentle, 3:1, 15, or 33%
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 0 tons/year
Right Approach
Length: 300 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 1.62 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.62 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? Yes, Replacement.
Were any non-native species observerd at this site? No
Site Comments: Culvert acting as a dam
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.