Road Stream Crossing Site AB09
Alcona-Black River Watershed, North Branch Black River
E Black River Rd
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.8153916,-83.3322061
T 028N R 009 Sec 15
Fish Passability: Barrier at High Flows
Structure is NOT Perched
Total Erosion: 0.58 tons/year
Overall Score: 21
Severity: Moderate
Date Inventoried: 5/3/2022
Road Approach - Left
Road Approach - Right
Inlet
Upstream Conditions
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: 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 62 ft. Width 10 ft. Height 8 ft.
Percentage Plugged: None or 0%
Percentage Crushed: None or 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 4.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.8 ft./sec.
Structure Outlet
Water Depth: 4.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.2 ft./sec.
*Water Velocities were measured 2 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? No
Is Upstream Ponding Present? No
Riffle Information
Water Depth: 3 ft.
Bankfull Width: 32 ft.
Wetted Width: 25 ft.
Water Velocity: 0.8 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: 30 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.4 ft.
Slope: Steep, 1:1, 45°, or 100%
Downstream
Fill Depth: 2.3 ft.
Slope: Moderate, 2:1, 22.5°, or 41%
Approaches
Left Approach
Length: 785 ft.
Slope: 1-5%
Vegetation: Partial, Ditch has some vegetation and some bare, eroding places.
Erosion Estimate: 0.58 tons/year
Right Approach
Length: 1000 ft.
Slope: 1-5%
Vegetation: None, Ditch has been recently graded and is bare of vegetation.
Erosion Information
Estimate of Total Erosion at Crossing: 0.58 tons/year
Summary Information
Fish Passability: Barrier at High Flows
Is a future visit to this site recommended? No
Were any non-native species observerd at this site? Yes, Mullein.
Site Comments: Lots of beaver activity. Beaver dam upstream.
*These data are maintained in the Michigan DNR Road Stream Crossing Inventory.