Road Stream Crossing Site AUS_CR109

Au Sable River Watershed, West Branch Big Creek
Snowmobile Trail
Lovells Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.96926 , -84.68189
T28N R01W Sec 4
Owned by State
Fish Passability 1
Structure is NOT Perched
Total Erosion: 0.9434 tons/year
Severity: Moderate
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: Outlet Apron
Structure Material: Wood
Structure Substrate: Sand
General Conditions: New
Structure Interior: smooth
Dimensions of Structure: Length 12 ft. , Width 42 ft. , Height 5.8 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.6 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.8 ft./sec.
*Water Velocities were measured at the Surface (with Meter)
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: 0.5 ft.
Bankfull Width: 24 ft.
Wetted Width: 22.7 ft.
Water Velocity: 1.2 ft./sec. (Measured with Meter)
Dominant Substrate: Sand
Road Information
Gravel Other Road
Road Condition: Fair
Road Width at Culvert: 12 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 3 ft.
Slope: Vertical
Downstream
Fill Depth: 3 ft.
Slope: Vertical
Approaches
Left Approach
Length: 170 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.412
Erosion: 0.2315 tons/year
Right Approach
Length: 440 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.488
Erosion: 0.7098 tons/year
Erosion Information
Total Erosion at Crossing: 0.9434 tons/year
Extent of Erosion: Minor
Erosion is occurring and corrective actions can be installed to address the problem.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Left Approach
4 ft.
2.1 ft.
0.4 ft.
no
Gravel
0.0016
Left Approach
2 ft.
1.5 ft.
0.2 ft.
no
Gravel
0.0004
Summary Information
Fish Passability 1
These non-native species were observerd at this site: Spotted Knapweed, Sweet Clover