Road Stream Crossing Site BSAB_BS74

Big Sable River Watershed, Freeman Creek
Freeman Rd
Grant Twp, Mason County
Information collected by:
Site Location
GPS Coordinates: 44.09542 , -86.30811
T20N R17W Sec 26
Owned by Private
Structure is NOT Perched
Total Erosion: 21.1223 tons/year
Severity: Severe
Year Inventoried: 2011
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Open Bottom Arch
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 80 ft. , Width 18 ft. , Height 6 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 0.74 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.3 ft./sec.
Structure Outlet
Water Depth: 0.26 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.7 ft./sec.
*Water Velocities were measured 0.16 ft. below Surface (with Meter)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.23 ft.
Bankfull Width: 14.9 ft.
Wetted Width: 12.7 ft.
Water Velocity: 1 ft./sec. (Measured with Meter)
Dominant Substrate: Clay
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 33 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.2 ft.
Slope: 1:1.5
Downstream
Fill Depth: 3.3 ft.
Slope: 1:1
Approaches
Left Approach
Length: 681 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.809
Erosion: 11.1984 tons/year
Right Approach
Length: 621 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.758
Erosion: 9.9239 tons/year
Erosion Information
Total Erosion at Crossing: 21.1223 tons/year
Extent of Erosion: Moderate
Summary Information
Erosion is an area of concern for this site.

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