Road Stream Crossing Site PIGN_PR25

Pigeon River Watershed, Pigeon River
Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.3742274,-84.5148059
T 034N R 002 Sec 02
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 1.38 tons/year
Overall Score: 21
Severity: Moderate
Date Inventoried: 9/10/2021
Road Approach - Left
Road Approach - Left
Road Approach - Right
Road Approach - Right
Upstream Conditions
Upstream Conditions
Downstream Conditions
Downstream Conditions
Site Sketch
Site Sketch
Crossing Information*
Type of Crossing: Bridge
Number of Structures: 1
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
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 48 ft. Height 16 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 2 ft.
Water Velocity*: 3.1 ft./sec.
Structure Outlet
Water Depth: 3 ft.
Embedded Depth of Structure: 2 ft.
Water Velocity*: 3 ft./sec.
*Water Velocities were measured 2.8 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? No
Is Upstream Ponding Present? Yes
Pond: Length 55 ft., Width 80 ft.
Riffle Information
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: 34 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90
Fill Depth: 0 ft.
Slope: Vertical, 0:1, or 90
Left Approach
Length: 1000 ft.
Slope: 1-5%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 1.38 tons/year
Right Approach
Length: 0 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 1.38 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? Yes, Bull thistle, sweet clover, queen annes lace, leafy spurge, spotted knapweed.
Site Comments: Poor alignment, undersized bridge. Rep reach not recorded, river flowing too fast to safetly wade.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.