Road Stream Crossing Site BSAB_BS49

Big Sable River Watershed, Tributary of Big Sable River
Treml Rd
Freesoil Twp, Mason County
Information collected by:
Site Location
GPS Coordinates: 44.1218 , -86.23042
T20N R16W Sec 16
Owned by Private
Federal
Fish Passability 0
Perch Height: 0.5 ft.
Total Erosion: 3.1405 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: Projecting
Outlet Type: Cascade over Riprap
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 60 ft. , Width 8 ft. , Height 8 ft.
Percentage Plugged: Inlet: 1% to 25%
Perch Height: 0.5 ft.
Structure Inlet
Water Depth: 0.38 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.9 ft./sec.
Structure Outlet
Water Depth: 0.27 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.6 ft./sec.
*Water Velocities were measured 0.16 ft. below Surface (with Meter)
Additional Comments
Riprap pile at inlet preventing clear flow
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 10 ft. , Width 9 ft. , Depth 1.3 ft.
Riffle Information
Water Depth: 0.25 ft.
Bankfull Width: 10 ft.
Wetted Width: 5.6 ft.
Water Velocity: 1.2 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Gravel County Road (Seasonal)
Road Condition: Good
Road Width at Culvert: 10 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.8 ft.
Slope: 1:1
Downstream
Fill Depth: 3.3 ft.
Slope: 1:1
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 1.5702 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 1.5702 tons/year
Erosion Information
Total Erosion at Crossing: 3.1405 tons/year
Extent of Erosion: Minor
Notes: Minor stream bank erosion due to lack of stabilizing vegetation
Summary Information
Fish Passability 0
A future visit to this site is recommended. to correct riprap barrier

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