Road Stream Crossing Site PIGN_PR38

Pigeon River Watershed, Unnamed
Tin Bridge Rd
Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.2172363,-84.4373535
T 033N R 001 Sec 28
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Total Erosion: 18.45 tons/year
Overall Score: 50
Severity: Severe
Date Inventoried: 10/8/2021
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: Ford
Number of Structures: 1
Structure Shape: Other
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Other
Structure Substrate: Rock
General Conditions: Deterioration, shape changes, or segment disconnection more severe than the previous category to the extent that the road manager should be contacted to determine if the road should be closed.
Structure Interior: Other
Is Structure Rusted through? No
Dimensions of Structure: Length 194 ft. Width 4 ft. Height 0 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.6 ft./sec.
Structure Outlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.8 ft./sec.
*Water Velocities were measured 0.2 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? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 4.3 ft.
Wetted Width: 2 ft.
Water Velocity: 1.9 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: Broken Pavement or Rilled/Gullied, Multiple patches, cracks, rilling, or gullies at crossing.
Road Core Integrity: Poor (one or more symptoms are present and are compromising the integrity of the crossing)
Road Width at Culvert: 12 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Gentle, 3:1, 15, or 33%
Fill Depth: 0 ft.
Slope: Gentle, 3:1, 15, or 33%
Left Approach
Length: 0 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0 tons/year
Right Approach
Length: 1000 ft.
Slope: 6-10%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 10.41 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 18.45 tons/year
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Extent of Erosion
Estimated Erosion
facing downstream
Reaching Stream?
Road at Crossing1
194 ft.
3 ft.
0.5 ft.
Very Severe (corrective actions recommended)
Left Downstream Ditch
38 ft.
0.5 ft.
0.1 ft.
Sandy Loam
Severe (corrective actions recommended)
1stream is flowing through the road for 190 feet
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? Yes, stream enters roadand flows for 190 feet. Culvert needs to be installed.
Were any non-native species observerd at this site? No
Site Comments: stream is the road
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.