Road Stream Crossing Site LM080

Manistee River Watershed, Little Manistee River
6 Mile Bridge Rd
Stronach Twp, Manistee County
Information collected by:
Site Location
GPS Coordinates: 44.183491 , -86.16764
T21N R15W Sec 31
Owned by Federal
Fish Passability 0.5
Total Erosion: 0.008 tons/year
Severity: Moderate
Year Inventoried: 2019
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: Concrete
Structure Substrate: Mixture
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 30 ft. , Width 59 ft. , Height 7.2 ft.
Structure Inlet
Water Depth: 2.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.8 ft./sec.
Structure Outlet
Water Depth: 3.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.8 ft./sec.
*Water Velocities were measured 1.5 ft. below Surface (with Meter)
Additional Comments
Additional notes due to extreme flooding
Stream Information
Stream Flow: Bankfull
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 57 ft.
Wetted Width: 57 ft.
Water Velocity: 3.6 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved Federal Road
Road Condition: Good
Road Width at Culvert: 28 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Approaches
Left Approach
Length: 150 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.0069 tons/year
Right Approach
Length: 5 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.22
Erosion: 0.001 tons/year
Erosion Information
Total Erosion at Crossing: 0.008 tons/year
Summary Information
Fish Passability 0.5
These non-native species were observerd at this site: Knappweed