Road Stream Crossing Site AB34
Alcona-Black River Watershed, Black River
N Poor Farm Rd
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.70726659,-83.34107626
T 027N R 009 Sec 27
Fish Passability: Barrier at Most Flows
Structure is NOT Perched
Total Erosion: 0.05 tons/year
Overall Score: 37
Severity: Severe
Date Inventoried: 10/6/2022
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
Outlet
Downstream Conditions
Representative Reach
Other
Other
Other
Site Sketch
Crossing Information*
Type of Crossing: Culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Severe deterioration from corrosion or abrasion (more than 50% of the structure is rusted through) or cracking or spalling or chipping (more than 50% of the structure is compromised). Or Major shape changes (described above) reducing the capacity of the structure by greater than 50%. OR Segment disconnect causing major subsurface erosion/piping and/or partial fill failure and/or sink holes in the fill.
Structure Interior: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 43 ft. Width 5 ft. Height 4.9 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 0.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.2 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.2 ft./sec.
*Water Velocities were measured 0.7 ft. below the surface (via Flow Meter).
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? Yes
Scour Pool: Length 25 ft., Width 25 ft., Depth 4 ft.
Is Upstream Ponding Present? Yes
Pond: Length 10 ft., Width 50 ft.
Riffle Information
Water Depth: 0.6 ft.
Bankfull Width: 11 ft.
Wetted Width: 8.1 ft.
Water Velocity: 0.3 ft./sec. (measured via Flow Meter)
Dominant Substrate: Organics – decomposing plant material
Road Information
Road Surface: Paved
Owner: County
Road Condition: Impassible, Significant damage to road surface at crossing.
Road Core Integrity: Good (no symptoms of lack of integrity)
Road Width at Culvert: 22.7 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 8.5 ft.
Slope: Steep, 1:1, 45°, or 100%
Downstream
Fill Depth: 8 ft.
Slope: Steep, 1:1, 45°, or 100%
Erosion Information
Estimate of Total Erosion at Crossing: 0.05 tons/year
Summary Information
Fish Passability: Barrier at Most Flows
Is a future visit to this site recommended? Yes, Replacement.
Were any non-native species observerd at this site? No
Site Comments: Very poor alignment. Headwall on outlet is very deteriorated.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.