Road Stream Crossing Site AUS_CR039

Au Sable River Watershed, Au Sable River
I-75 Southbound
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.6623 , -84.69718
T26N R03W Sec 8
Owned by Private
Fish Passability 0.5
Total Erosion: 0.7914 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 76.2 ft. , Width 71 ft. , Height 13.7 ft.
Structure Inlet
Water Depth: 2.4 ft.
Water Velocity*: 1.8 ft./sec.
Structure Outlet
Water Depth: 2.2 ft.
Water Velocity*: 2.55 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 60 ft.
Riffle Information
Water Depth: 1.6 ft.
Bankfull Width: 99.5 ft.
Wetted Width: 86 ft.
Water Velocity: 2.67 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Paved Federal Road
Road Condition: Good
Road Width at Culvert: 42 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: Heavy
LS Factor: 0.57
Erosion: 0.7914 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 0.7914 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.5
A future visit to this site is recommended. To check extent of upstream pond.
These non-native species were observerd at this site: Bull Thistle, Queen Anne's Lace, Spotted Knapweed, Leafy Spurge