Road Stream Crossing Site PIGN_PR28

Pigeon River Watershed, Unnamed
Congdon
Charlevoix County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.2721987,-84.5323527
T 033N R 002 Sec 10
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 0.88 tons/year
Overall Score: 36
Severity: Severe
Date Inventoried: 9/7/2021
Road Approach - Left
Road Approach - Left
Road Approach - Right
Road Approach - Right
Inlet
Inlet
Upstream Conditions
Upstream Conditions
Outlet
Outlet
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: None
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 28 ft. Width 3.5 ft. Height 3.5 ft.
Percentage Plugged: 1% - 20% Inlet
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.6 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.3 ft./sec.
*Water Velocities were measured 0.5 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 15.5 ft., Depth 2.3 ft.
Is Upstream Ponding Present? Yes
Pond: Length 3 ft., Width 10 ft.
Riffle Information
Water Depth: 1.1 ft.
Bankfull Width: 6 ft.
Wetted Width: 5.5 ft.
Water Velocity: 1.3 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand particles are smaller than a pinhead and feel gritty between fingers
Road Information
Road Surface: Gravel
Owner: County
Road Condition: Old Pavement or Rutted, Minor cracking or rutting/ponding at crossing all or part of crossing length.
Road Core Integrity: Fair (some of the symptoms may be present, but not to an extent posing high risk to the crossing)
Road Width at Culvert: 17 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 1.5 ft.
Slope: Gentle, 3:1, 15, or 33%
Downstream
Fill Depth: 1.7 ft.
Slope: Moderate, 2:1, 22.5, or 41%
Approaches
Left Approach
Length: 160 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.04 tons/year
Right Approach
Length: 150 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.79 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.88 tons/year
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Extent of Erosion
Estimated Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Left Upstream Embankment
9 ft.
1 ft.
1 ft.
Yes
Gravel
Moderate (corrective actions recommended)
0.02
Right Downstream Embankment
8 ft.
1 ft.
1 ft.
Yes
Gravel
Moderate (corrective actions recommended)
0.03
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Reed canarygrass.
Site Comments: Undersized Road
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.