Road Stream Crossing Site AUS_CR030

Au Sable River Watershed, Bright Lake Creek
Lewiston Grade Rd
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.70625 , -84.69439
T27N R03W Sec 29
Owned by State
Fish Passability 0.9
Total Erosion: 0.9139 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Pipe Arch,Open Bottom Arch
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Fair
Multiple Culverts/Spans
4.2 ft.
33 ft.
3.2 ft.
Structure Interior: corrugated
Structure is Rusted through
Dimensions of Structure: Length 37 ft. , Width 4.2 ft. , Height 3.6 ft.
Percentage Plugged: Inlet: 0% In Pipe: 1% to 25%
Structure Inlet
Water Depth: 1.6 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 1.3 ft./sec.
Structure Outlet
Water Depth: 1.3 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 1 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 18 ft. , Width 25 ft. , Depth 2 ft.
Upstream Pond: Length 50 ft. , Width 63 ft.
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 25.5 ft.
Wetted Width: 18.6 ft.
Water Velocity: 2.35 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Sand County Road
Road Condition: Fair
Road Width at Culvert: 24 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 1.5 ft.
Slope: More than 1:2
Fill Depth: 1 ft.
Slope: 1:1.5
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Right Approach
Length: 300 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.46
Erosion: 0.9124 tons/year
Erosion Information
Total Erosion at Crossing: 0.9139 tons/year
Extent of Erosion: Minor
Notes: Gravel and sand eroding on top of culverts into stream from dirt road.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Right Approach
3 ft.
3 ft.
0.5 ft.
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Culverts are extremely rusted. There is a lot of impounded water also.
These non-native species were observerd at this site: Spotted Knapweed