Road Stream Crossing Site AUS_CR009

Au Sable River Watershed, Au Sable River
Pollack Bridge Rd
Frederic Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.68583 , -84.74477
T27N R04W Sec 36
Owned by Private
Fish Passability 0.5
Structure is NOT Perched
Total Erosion: 1.1871 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: 10-30 Degree or 30-70 Degree
Outlet Type: At Stream Grade
Structure Material: Wood
Structure Substrate: Sand
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 33 ft. , Width 30 ft. , Height 6 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 2.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.3 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.1 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: 34 ft.
Wetted Width: 31.5 ft.
Water Velocity: 2.2 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Sand County Road
Road Condition: Good
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: 270 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.532
Erosion: 1.1871 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 1.1871 tons/year
Extent of Erosion: Minor
Notes: Minor erosion from dirt road and vehicle traffic.
Summary Information
Fish Passability 0.5