Road Stream Crossing Site AB13
Alcona-Black River Watershed, Black River
La Vargne Rd
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.801063115607,-83.3238802079345
T 028N R 009 Sec 26
Fish Passability: Barrier
Perch Height: 0.5 ft.
Total Erosion: 0 tons/year
Overall Score: 25
Severity: Severe
Date Inventoried: 4/14/2022
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: Ellipse
Inlet Type: Projecting
Outlet Type: Cascade Over Riprap
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: Corrugated
Is Structure Rusted through? No
Dimensions of Structure: Length 29 ft. Width 12 ft. Height 8.5 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Perch Height: 0.5 ft.
Structure Inlet
Water Depth: 2.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.9 ft./sec.
Structure Outlet
Water Depth: 2.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.9 ft./sec.
*Water Velocities were measured 0.2 ft. below the surface (via Flow Meter).
Additional Comments
This road is the only access point for landowners on the east side of the black river
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 60 ft., Width 22 ft., Depth 3 ft.
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 4.8 ft.
Bankfull Width: 23 ft.
Wetted Width: 22 ft.
Water Velocity: 1 ft./sec. (measured via Flow Meter)
Dominant Substrate: Sand – particles are smaller than a pinhead and feel gritty between fingers
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: 22 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 0.5 ft.
Slope: Steep, 1:1, 45°, or 100%
Downstream
Fill Depth: 0.5 ft.
Slope: Steep, 1:1, 45°, or 100%
Approaches
Left Approach
Length: 0 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Right Approach
Length: 0.5 ft.
Slope: < 1%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0 tons/year
Erosion Information
Estimate of Total Erosion at Crossing: 0 tons/year
Summary Information
Fish Passability: Barrier
Is a future visit to this site recommended? Yes, Replacement.
Were any non-native species observerd at this site? Yes, Possibly oriental bittersweet. Once leaves are present this should be confirmed.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.