Road Stream Crossing Site AB06
Alcona-Black River Watershed, DeRocher
E Black River Rd
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.8150074738154,-83.3667384338378
T 028N R 009 Sec 20
Fish Passability: Not a Barrier
Structure is NOT Perched
Total Erosion: 3.15 tons/year
Overall Score: 5
Severity: Minor
Date Inventoried: 10/5/2022
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: Mitered
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 49 ft. Width 7.5 ft. Height 4 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0 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: 0.2 ft.
Bankfull Width: 5 ft.
Wetted Width: 5 ft.
Water Velocity: 0.1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Organics – decomposing plant material
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: 29 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1 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: 1000 ft.
Slope: 6-10%
Vegetation: Heavy, Ditch is fully vegetated or rip-rapped with no signs of erosion.
Erosion Estimate: 1.97 tons/year
Right Approach
Length: 1000 ft.
Slope: 6-10%
Erosion Estimate: 1.18 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 3.15 tons/year
Summary Information
Fish Passability: Not a Barrier
Site Comments: Wetlqnd upstream, no significant stream channel upstream or down
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.