Road Stream Crossing Site AUS_CR031

Au Sable River Watershed, East Branch Au Sable River
Wilcox Bridge Rd
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.70263 , -84.68707
T27N R03W Sec 29
Owned by Private
Fish Passability 0.9
Total Erosion: 0.1346 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Square/Rectangle
Inlet Type: 10-30 Degree or 30-70 Degree
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: Sand
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 34.5 ft. , Width 29 ft. , Height 6.1 ft.
Structure Inlet
Water Depth: 3 ft.
Water Velocity*: 1.43 ft./sec.
Structure Outlet
Water Depth: 2.3 ft.
Water Velocity*: 1.56 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 61 ft. , Width 30 ft. , Depth 4.1 ft.
Upstream Pond: Length 35 ft. , Width 33 ft.
Riffle Information
Water Depth: 2.8 ft.
Bankfull Width: 38 ft.
Wetted Width: 28 ft.
Water Velocity: 2.08 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 29.5 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Left Approach
Length: 300 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.46
Erosion: 0.1346 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 0.1346 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Creation of impoundment on the downstream side of bridge due largely to placement of rocks. Could be something to check out later.
These non-native species were observerd at this site: Spotted Knapweed