Road Stream Crossing Site BSAB_BS25

Big Sable River Watershed, Big Sable River
Tyndal Rd
Sheridan Twp, Mason County
Information collected by:
Site Location
GPS Coordinates: 44.05022 , -86.03934
T19N R15W Sec 12
Owned by Private
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 0.7537 tons/year
Severity: Moderate
Year Inventoried: 2011
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30-70 Degree
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Sand
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 20 ft. , Width 25 ft. , Height 7 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 2.55 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.3 ft./sec.
Structure Outlet
Water Depth: 2.04 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.3 ft./sec.
*Water Velocities were measured 1.23 ft. below Surface (with Meter)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 2.4 ft.
Bankfull Width: 65 ft.
Wetted Width: 60 ft.
Water Velocity: 1.4 ft./sec. (Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 20 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: 1:1
Fill Depth: 0 ft.
Slope: 1:1
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.3769 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.3769 tons/year
Erosion Information
Total Erosion at Crossing: 0.7537 tons/year
Extent of Erosion: Minor
Notes: The drainage structure is clogged with debris resulting in some road runoff directly entering the stream via the bridge.
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. to repair functionality of the road drainage structure

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