Road Stream Crossing Site PIGN_PR19

Pigeon River Watershed, Unnamed
Afton Rd
Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.3246942,-84.508385
T 034N R 002 Sec 23
Fish Passability: Barrier
Perch Height: 1.3 ft.
Total Erosion: 29.01 tons/year
Overall Score: 33
Severity: Severe
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
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: Freefall into Pool
Structure Material: Metal
Structure Substrate: None
General Conditions: Moderate to major deterioration from corrosion or abrasion (less than 5% of the structure has small holes or is nearly rusted through) or cracking or spalling or chipping (several small cracks or moderate chipping in the concrete). OR Moderate shape changes (described above).
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 120 ft. Width 3 ft. Height 3 ft.
Percentage Plugged: None or 0%
Percentage Crushed: 21% - 40%
Perch Height: 1.3 ft.
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.4 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.7 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? Yes
Scour Pool: Length 20 ft., Width 15 ft., Depth 1.7 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 10 ft.
Wetted Width: 7 ft.
Water Velocity: 0.4 ft./sec. (measured via Flow Meter)
Dominant Substrate: Gravel rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Gravel
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: 26 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 17 ft.
Slope: Steep, 1:1, 45, or 100%
Fill Depth: 17 ft.
Slope: Steep, 1:1, 45, or 100%
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Estimate: 0 tons/year
Right Approach
Length: 600 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 29.01 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 29.01 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, Spotted knapweed.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.