Road Stream Crossing Site BSAB_BS76

Big Sable River Watershed, Tributary of Big Sable River
Townline Rd
Grant Twp, Mason County
Information collected by:
Site Location
GPS Coordinates: 44.07938 , -86.29029
T20N R17W Sec 36
Owned by Private
Fish Passability 0.9
Total Erosion: 6.1896 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: Round
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 50 ft. , Width 7 ft. , Height 7 ft.
Structure Inlet
Water Depth: 2.25 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 2.23 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.05 ft./sec.
*Water Velocities were measured 1.34 ft. below Surface (with Meter)
Additional Comments
Stream is ditched for agriculture both upstream and downstream
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.82 ft.
Bankfull Width: 13.9 ft.
Wetted Width: 3.6 ft.
Water Velocity: 0.9 ft./sec. (Measured with Meter)
Dominant Substrate: Sand
Road Information
Gravel County Road
Road Condition: Poor
Road Width at Culvert: 36 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.3 ft.
Slope: Vertical
Downstream
Fill Depth: 2.8 ft.
Slope: Vertical
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 5.6529 tons/year
Right Approach
Length: 1000 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.4959 tons/year
Erosion Information
Total Erosion at Crossing: 6.1896 tons/year
Extent of Erosion: Minor
Notes: Minor embankment erosion due to road runoff
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Left Upstream Embankment
11 ft.
3.5 ft.
2.5 ft.
yes
Sandy Loam
0.0264
Right Downstream Embankment
5 ft.
3 ft.
3 ft.
no
Sandy Loam
0.0144
Summary Information
Fish Passability 0.9