Road Stream Crossing Site AUS_CR040

Au Sable River Watershed, Au Sable River
I-75 Northbound
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.66631 , -84.69669
T26N R03W Sec 8
Owned by Private
Fish Passability 0.5
Total Erosion: 1.124 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: Gravel
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 72.7 ft. , Width 65 ft. , Height 13.8 ft.
Structure Inlet
Water Depth: 2.1 ft.
Water Velocity*: 2.86 ft./sec.
Structure Outlet
Water Depth: 2.1 ft.
Water Velocity*: 2.96 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 2.8 ft.
Bankfull Width: 72.5 ft.
Wetted Width: 67 ft.
Water Velocity: 2.5 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Paved Federal Road
Road Condition: Good
Road Width at Culvert: 42.5 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.124 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 1.124 tons/year
Extent of Erosion: Minor
Notes: Silt Traps installed along all approaches.
Summary Information
Fish Passability 0.5
A future visit to this site is recommended. To treat non-native invasive species
These non-native species were observerd at this site: Leafy Spurge, Bull Thistle, Queen Anne's Lace, Spotted Knapweed