Road Stream Crossing Site AUS_CR076

Au Sable River Watershed, South Branch Au Sable River
South Branch Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.61412 , -84.45638
T26N R01W Sec 29
Owned by State
Fish Passability 0
Structure is NOT Perched
Total Erosion: 2.9015 tons/year
Severity: Severe
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 50 ft. , Width 224 ft. , Height 33 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 2.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.17 ft./sec.
Structure Outlet
Water Depth: 2.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.57 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 2.3 ft.
Bankfull Width: 79 ft.
Wetted Width: 68 ft.
Water Velocity: 3.33 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Paved State Road
Road Condition: Good
Road Width at Culvert: 33.5 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Left Approach
Length: 1000 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 2.05
Erosion: 2.2702 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.6312 tons/year
Erosion Information
Total Erosion at Crossing: 2.9015 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site. High water velocity.
A future visit to this site is recommended. Check for changes in velocity, flow is currently high
These non-native species were observerd at this site: Spotted Knapweed, Leafy Spurge, Mullein