Road Stream Crossing Site PIGN_PR24
Pigeon River Watershed, Pigeon River
Afton Rd
Cheboygan County
Information collected by:
Site Location
GPS Coordinates: 45.3637532,-84.5073684
T 034N R 002 Sec 02
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 0.54 tons/year
Overall Score: 15
Severity: Moderate
Date Inventoried: 9/7/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Headwall and Wingwall
Outlet Type: Cascade Over Riprap
Structure Material: Concrete
Structure Substrate: Rock
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 31.5 ft. Width 115 ft. Height 9 ft.
Percentage Plugged: 21% - 40% Inlet
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.7 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3 ft./sec.
*Water Velocities were measured 1.4 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: 2.3 ft.
Bankfull Width: 45 ft.
Wetted Width: 40 ft.
Water Velocity: 2.9 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Paved
Owner: County
Road Condition: New Pavement or Well Graded, Same condition as initial placement.
Road Core Integrity: Good (no symptoms of lack of integrity)
Road Width at Culvert: 30.5 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 8 ft.
Slope: Vertical, 0:1, or 90°
Downstream
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90°
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Right Approach
Length: 300 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.54 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.54 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? No
Site Comments: Right side of bridge is plugged by debris
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.