Road Stream Crossing Site AUS_CR029

Au Sable River Watershed, Bright Lake Creek
Wilcox Bridge Rd
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.71508 , -84.69125
T27N R03W Sec 20
Owned by State
Fish Passability 0.9
Total Erosion: 0.354 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Ellipse
Inlet Type: Apron
Outlet Type: Outlet Apron
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 40 ft. , Width 2.4 ft. , Height 1.7 ft.
Percentage Plugged: Inlet: 0% In Pipe: 1% to 25%
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.47 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.05 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 10 ft. , Width 11 ft. , Depth 0.6 ft.
Upstream Pond: Length 12 ft. , Width 10 ft.
Riffle Information
Water Depth: 0.2 ft.
Bankfull Width: 17 ft.
Wetted Width: 5.5 ft.
Water Velocity: 2.22 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 30 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 1.6 ft.
Slope: More than 1:2
Fill Depth: 2 ft.
Slope: More than 1:2
Left Approach
Length: 110 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.384
Erosion: 0.3491 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 0.354 tons/year
Extent of Erosion: Minor
Notes: Sand Sediment from the left approaches and a minor amount of gravel from grading of the dirt road.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Left Approach
14 ft.
2 ft.
0.2 ft.
Left Approach
8 ft.
3 ft.
0.2 ft.
Summary Information
Fish Passability 0.9