Road Stream Crossing Site AUS_CR013

Au Sable River Watershed, Au Sable River
James Rd (1-75 Business Loop)
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.66153 , -84.713
T26N R03W Sec 7
Owned by Local Government
Fish Passability 0.5
Structure is NOT Perched
Total Erosion: 0.7458 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Other
Outlet Type: Cascade over Riprap
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 61 ft. , Width 40 ft. , Height 11 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.59 ft./sec.
Structure Outlet
Water Depth: 1.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.46 ft./sec.
*Water Velocities were measured 0.4 ft. below Surface (with Meter)
Additional Comments
City park located on upstream side of bridge crossing
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 47 ft. , Width 42 ft. , Depth 1.6 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 1.7 ft.
Bankfull Width: 36.5 ft.
Wetted Width: 33.5 ft.
Water Velocity: 2.72 ft./sec. (Measured with Meter)
Dominant Substrate: Cobble
Road Information
Paved State Road
Road Condition: Good
Road Width at Culvert: 63 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Right Approach
Length: 540 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.656
Erosion: 0.7378 tons/year
Erosion Information
Total Erosion at Crossing: 0.7458 tons/year
Extent of Erosion: Minor
Notes: Spots of erosion around the bridge, but nothing extreme.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Left Approach
40 ft.
15 ft.
0.2 ft.
Summary Information
Fish Passability 0.5
Fish Passage is an area of concern for this site. Rapids at inlet of bridge due to long term removal of the dam pond in Grayling.