Road Stream Crossing Site AUS_OS041
Au Sable River Watershed, West Branch Big Creek
County Rd 489
Big Creek Twp,
Oscoda County
Information collected by:
Site Location
GPS Coordinates: 44.62733
, -84.27132
T26N
R01E
Sec 23,24
Owned by Private
Fish Passability 0.5
Total Erosion: 0.034 tons/year
Severity: Moderate
Year Inventoried: 2013
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: Bridge
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Good
Dimensions of Structure: Length 42.5 ft.
, Width 84 ft.
, Height 4.8 ft.
Structure Inlet
Water Depth: 1.6 ft.
Water Velocity*: 2.4 ft./sec.
Structure Outlet
Water Depth: 2.7 ft.
Water Velocity*: 1.03 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than 1/2 Bankfull
Scour Pool: Length 12 ft.
, Width 14 ft.
Riffle Information
Water Depth: 1 ft.
Bankfull Width: 36 ft.
Wetted Width: 24 ft.
Water Velocity: 1.88 ft./sec.
(Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 39 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.2 ft.
Slope: More than 1:2
Downstream
Fill Depth: 2.2 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 0 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0 tons/year
Right Approach
Length: 528 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.034 tons/year
Erosion Information
Total Erosion at Crossing: 0.034 tons/year
Summary Information
Fish Passability 0.5
These non-native species were observerd at this site: Queen Anne's Lace, Spotted Knapweed, White Sweet grass