Road Stream Crossing Site AUS_CR029
Au Sable River Watershed, Bright Lake Creek
Wilcox Bridge Rd
Grayling Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.71508
, -84.69125
T27N
R03W
Sec 20
Owned by State
Fish Passability 0.9
Total Erosion: 0.354 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Ellipse
Inlet Type: Apron
Outlet Type: Outlet Apron
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 40 ft.
, Width 2.4 ft.
, Height 1.7 ft.
Percentage Plugged:
Inlet: 0%
In Pipe: 1% to 25%
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.47 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.05 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 10 ft.
, Width 11 ft.
, Depth 0.6 ft.
Upstream Pond: Length 12 ft.
, Width 10 ft.
Riffle Information
Water Depth: 0.2 ft.
Bankfull Width: 17 ft.
Wetted Width: 5.5 ft.
Water Velocity: 2.22 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 30 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 1.6 ft.
Slope: More than 1:2
Downstream
Fill Depth: 2 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 110 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.384
Erosion: 0.3491 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 0.354 tons/year
Extent of Erosion: Minor
Notes: Sand Sediment from the left approaches and a minor amount of gravel from grading of the dirt road.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Approach |
14 ft. |
2 ft. |
0.2 ft. |
yes |
Sand |
0.0031 |
Left Approach |
8 ft. |
3 ft. |
0.2 ft. |
yes |
Sand |
0.0018 |
Summary Information
Fish Passability 0.9