Road Stream Crossing Site AUS_CR028

Au Sable River Watershed, Bright Lake Creek
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.72621 , -84.68513
T27N R03W Sec 21
Owned by State
Fish Passability 0.9
Total Erosion: 8.6364 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Pipe Arch,Open Bottom Arch
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 90 ft. , Width 6.4 ft. , Height 4.6 ft.
Structure Inlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0.6 ft.
Water Velocity*: 0.83 ft./sec.
Structure Outlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.6 ft.
Water Velocity*: 0.3 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Additional Comments
Hartwick Pines
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.5 ft.
Bankfull Width: 12 ft.
Wetted Width: 8.5 ft.
Water Velocity: 1.18 ft./sec. (Measured with Float Test)
Dominant Substrate: Silt
Road Information
Gravel State Road
Road Condition: Good
Road Width at Culvert: 55 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 2.1 ft.
Slope: More than 1:2
Fill Depth: 2 ft.
Slope: More than 1:2
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 8.6364 tons/year
Erosion Information
Total Erosion at Crossing: 8.6364 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.9
These non-native species were observerd at this site: Spotted Knapweed