Road Stream Crossing Site PIGN_PR36

Pigeon River Watershed, Unnamed
Tin Bridge Rd
Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.2193616,-84.43526
T 033N R 001 Sec 28
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.46 tons/year
Overall Score: 40
Severity: Severe
Date Inventoried: 10/8/2021
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: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
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
Dimensions of Structure: Length 21 ft. Width 1.5 ft. Height 1.5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: 21% - 40%
Structure is NOT Perched
Structure Inlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.5 ft.
Water Velocity*: 0.6 ft./sec.
Structure Outlet
Water Depth: 1.1 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0.7 ft./sec.
*Water Velocities were measured 0.9 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? Yes
Scour Pool: Length 7.7 ft., Width 7 ft., Depth 1 ft.
Is Upstream Ponding Present? Yes
Pond: Length 4 ft., Width 4.7 ft.
Riffle Information
Water Depth: 0.6 ft.
Bankfull Width: 4 ft.
Wetted Width: 3.3 ft.
Water Velocity: 0.2 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: Other
Runoff Path: Roadway
Fill Depth: 0.3 ft.
Slope: Gentle, 3:1, 15, or 33%
Fill Depth: 0.3 ft.
Slope: Gentle, 3:1, 15, or 33%
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: 0.46 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.46 tons/year
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? Yes, Replacement.
Were any non-native species observerd at this site? No
Site Comments: Camper approached us and said he has caught brook trout in this stretch of stream
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.