Road Stream Crossing Site CLHW_GCBM-008
Greene Creek-Black Mallard River Watershed, Elliot Creek
Seffren Rd
Benton Twp,
Cheboygan County
Information collected by:
Site Location
GPS Coordinates: 45.64626,-84.40063
T 038N R 001 Sec 26
Owned by State
Fish Passability: Barrier
Structure is NOT Perched
Total Erosion: 0.04 tons/year
Overall Score: 11
Severity: Minor
Date Inventoried: 4/26/2022
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: Pipe Arch
Inlet Type: Headwall and Wingwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: No deficiencies. New structure or nearly new condition.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 64 ft. Width 18 ft. Height 5.5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 2.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.1 ft./sec.
Structure Outlet
Water Depth: 1.3 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0.9 ft./sec.
*Water Velocities were measured 0.2 ft. below the surface (via Float Test).
Stream Information
Stream Flow: < 1/2 Bankfull – The stream channel is less than half filled with water.
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: 1.7 ft.
Bankfull Width: 14.6 ft.
Wetted Width: 11.6 ft.
Water Velocity: 1.1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Gravel – rocks between the size of a pinhead and a baseball
Road Information
Road Surface: Paved
Owner: State
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: 32 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.8 ft.
Slope: Gentle, 3:1, 15°, or 33%
Downstream
Fill Depth: 0.7 ft.
Slope: Gentle, 3:1, 15°, or 33%
Approaches
Left Approach
Length: 400 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.02 tons/year
Right Approach
Length: 350 ft.
Slope: < 1%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 0.02 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0.04 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: Site recently replaced. Riffle directly upstream causing high velocity. Sediment is depositing in inlet and outlet. Pike observed downstream of culver.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.