Road Stream Crossing Site PM_N001

Pere Marquette River Watershed, Little South Branch
17 Mile Rd
Home Twp, Newaygo County
Information collected by:
Site Location
GPS Coordinates: 43.800437 , -85.771031
T16N R12W Sec 5
Owned by Private
Total Erosion: 0.3116 tons/year
Severity: Restored
Year Inventoried: 2014
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: Mixture
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 21 ft. , Width 42 ft. , Height 8 ft.
Structure Inlet
Water Depth: 1.3 ft.
Water Velocity*: 2.9 ft./sec.
Structure Outlet
Water Depth: 1.1 ft.
Water Velocity*: 2.7 ft./sec.
*Water Velocities were measured 1 ft. below Surface (with Meter)
Additional Comments

Paved on top of bridge

Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.7 ft.
Bankfull Width: 45 ft.
Wetted Width: 45 ft.
Water Velocity: 3 ft./sec. (Measured with Meter)
Dominant Substrate: Cobble
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 20 ft.
Location of Low Point: Other
Runoff Path: Roadway
Slope: Vertical
Slope: Vertical
Left Approach
Length: 200 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.0551 tons/year
Right Approach
Length: 120 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.388
Erosion: 0.2565 tons/year
Erosion Information
Total Erosion at Crossing: 0.3116 tons/year
Extent of Erosion: Moderate
Summary Information
Erosion is an area of concern for this site.