Road Stream Crossing Site PIGN_PR17

Pigeon River Watershed, Unnamed
Webber Rd
Charlevoix County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.2910879,-84.4675748
T 034N R 001 Sec 32
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.87 tons/year
Overall Score: 24
Severity: Moderate
Date Inventoried: 9/7/2021
Road Approach - Left
Road Approach - Left
Road Approach - Right
Road Approach - Right
Inlet
Inlet
Upstream Conditions
Upstream Conditions
Outlet
Outlet
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: Pipe Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Light superficial corrosion or abrasion or chipping or spalling or cracking. No shape changes (described above).
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 46 ft. Width 5 ft. Height 3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 0.4 ft./sec.
Structure Outlet
Water Depth: 1.1 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0.4 ft./sec.
*Water Velocities were measured 0.8 ft. below the surface (via Flow Meter).
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 9 ft., Width 9 ft., Depth 0.8 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 1.1 ft.
Bankfull Width: 6.5 ft.
Wetted Width: 7.6 ft.
Water Velocity: 0.3 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Sand
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: 21 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 4 ft.
Slope: Moderate, 2:1, 22.5, or 41%
Downstream
Fill Depth: 4 ft.
Slope: Moderate, 2:1, 22.5, or 41%
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
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: 0.8 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.87 tons/year
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Extent of Erosion
Estimated Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Downstream Embankment
10 ft.
3 ft.
1 ft.
Yes
Gravel
Moderate (corrective actions recommended)
0.07
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: Road fill entering stream
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.