Road Stream Crossing Site AUS_PR094
Au Sable River Watershed, Pine River
F-30
Mikado Twp,
Alcona County
Information collected by:
Site Location
GPS Coordinates: 44.59034
, -83.44806
T25N
R08E
Sec 3
Owned by Private
Fish Passability 1
Structure is NOT Perched
Total Erosion: 0.566 tons/year
Severity: Minor
Year Inventoried: 2012
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 33 ft.
, Width 101 ft.
, Height 12 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 2.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.3 ft./sec.
Structure Outlet
Water Depth: 2.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.4 ft./sec.
*Water Velocities were measured at the Surface
(with Meter)
Additional Comments
Rocks piled across span of bridge underneath is near outlet are causing water velocity to increase.
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 1.2 ft.
Bankfull Width: 34 ft.
Wetted Width: 28 ft.
Water Velocity: 2.9 ft./sec.
(Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 31 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 2.6 ft.
Slope: Vertical
Downstream
Fill Depth: 2.6 ft.
Slope: Vertical
Approaches
Left Approach
Length: 618 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.523
Erosion: 0.331 tons/year
Right Approach
Length: 465 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.493
Erosion: 0.2349 tons/year
Erosion Information
Total Erosion at Crossing: 0.566 tons/year
Summary Information
Fish Passability 1
These non-native species were observerd at this site: Spotted Knapweed, Sweet Clover, Autumn Olive, Mullein