Road Stream Crossing Site AUS_CR006

Au Sable River Watershed, Au Sable River
County Rd 612
Frederic Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.77816 , -84.76236
T28N R04W Sec 35
Owned by Private
Fish Passability 0.9
Total Erosion: 0.3529 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: Fair
Structure Interior: smooth
Structure is Rusted through
Dimensions of Structure: Length 34 ft. , Width 49 ft. , Height 8.7 ft.
Structure Inlet
Water Depth: 1.3 ft.
Water Velocity*: 1.64 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Water Velocity*: 1.312 ft./sec.
*Water Velocities were measured 0.4 ft. below Surface (with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 48 ft. , Width 34 ft. , Depth 1.2 ft.
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 71 ft.
Wetted Width: 61 ft.
Water Velocity: 1.57 ft./sec. (Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved County Road
Road Condition: Poor
Road Width at Culvert: 30 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Left Approach
Length: 0 ft.
Slope: 0%
Vegetation: Partial
LS Factor: 0.05
Erosion: 0 tons/year
Right Approach
Length: 290 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.456
Erosion: 0.1311 tons/year
Erosion Information
Total Erosion at Crossing: 0.3529 tons/year
Extent of Erosion: Moderate
Notes: Caused by foot traffic access to stream
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Left Approach
96 ft.
7 ft.
0.3 ft.
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Wing walls are slightly tilted/ deteriorated and the metal support walls are extremely rusted.