Road Stream Crossing Site EUP_PRW38
Pine River Watershed, Elmhirst Creek
FR 3113
Mackinac County
Information collected by:
Site Location
GPS Coordinates: 46.1260151,-84.6972406
T 043N R 003 Sec 17
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Total Erosion: 0.44 tons/year
Overall Score: 26
Severity: Moderate
Date Inventoried: 5/28/2021
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Apron
Outlet Type: At Stream Grade
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: Smooth
Is Structure Rusted through? Yes
Dimensions of Structure: Length 72 ft. Width 2 ft. Height 2 ft.
Percentage Plugged: 1% - 20% Inlet
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.7 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.5 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 9 ft., Width 9 ft., Depth 1.2 ft.
Is Upstream Ponding Present? Yes
Pond: Length 11 ft., Width 8 ft.
Riffle Information
Water Depth: 0.7 ft.
Bankfull Width: 8 ft.
Wetted Width: 6 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: Gravel
Owner: Federal
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: 22 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 8.5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 8.5 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 870 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.26 tons/year
Right Approach
Length: 600 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.18 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.44 tons/year
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Spotted knapweed.
Site Comments: Debris blocking inlet
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.