Road Stream Crossing Site AUS_CR045

Au Sable River Watershed, Tributary of Au Sable River
Whirlpool Rd
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.66728 , -84.61708
T26N R03W Sec 12
Owned by Private
Fish Passability 0.9
Total Erosion: 0.6851 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Ellipse
Inlet Type: Apron
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 42.8 ft. , Width 3.4 ft. , Height 2.3 ft.
Percentage Plugged: Inlet: 0% In Pipe: 51% to 75%
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0.5 ft.
Water Velocity*: 0.91 ft./sec.
Structure Outlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 1.67 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.2 ft.
Bankfull Width: 16 ft.
Wetted Width: 10 ft.
Water Velocity: 1.3 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 27.5 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 2.2 ft.
Slope: 1:1.5
Fill Depth: 2 ft.
Slope: 1:2
Left Approach
Length: 470 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.604
Erosion: 0.6851 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 0.6851 tons/year
Extent of Erosion: Minor
Notes: Road Commishion diversions on upstream and downstream left approaches.
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. To see how cement bags are holding up around culvert. They are in kind of rough shape.
These non-native species were observerd at this site: Bull Thistle, Spotted Knapweed