Road Stream Crossing Site AUS_CR012

Au Sable River Watershed, Au Sable River
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.6588 , -84.72757
T26N R03W Sec 7
Owned by Private
Fish Passability 0.5
Total Erosion: 0.316 tons/year
Severity: Moderate
Year Inventoried: 2013
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: Rock
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 110 ft. , Width 57.3 ft. , Height 8.4 ft.
Structure Inlet
Water Depth: 3.2 ft.
Water Velocity*: 2.1 ft./sec.
Structure Outlet
Water Depth: 3.1 ft.
Water Velocity*: 2.27 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Upstream Pond: Length 100 ft. , Width 75 ft.
Riffle Information
Water Depth: 3.1 ft.
Bankfull Width: 61 ft.
Wetted Width: 55.5 ft.
Water Velocity: 2.4 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved State Road
Road Condition: Good
Road Width at Culvert: 70 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Length: 0 ft.
Slope: 0%
Vegetation: Partial
LS Factor: 0
Erosion: 0 tons/year
Right Approach
Length: 290 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.456
Erosion: 0.306 tons/year
Erosion Information
Total Erosion at Crossing: 0.316 tons/year
Extent of Erosion: Minor
Notes: Gravel/ rock walkway on downstream left approach
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Left Approach
20 ft.
6 ft.
0.5 ft.
Summary Information
Fish Passability 0.5
These non-native species were observerd at this site: Leafy Spurge, spotted knotweed, bull thistle, buckthorn?