Road Stream Crossing Site PM_L007
Pere Marquette River Watershed, Little South Branch
76th St
Pleasant Plains Twp,
Lake County
Information collected by:
Site Location
GPS Coordinates: 43.8502366817767
, -85.8433176577091
T17N
R13W
Sec 22
Owned by Private
Total Erosion: 1.3603 tons/year
Severity: Restored
Year Inventoried: 2014
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: Cascade over Riprap
Structure Material: Wood
Structure Substrate: Mixture
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 34 ft.
, Width 59 ft.
, Height 10 ft.
Structure Inlet
Water Depth: 3.4 ft.
Water Velocity*: 3 ft./sec.
Structure Outlet
Water Depth: 2.5 ft.
Water Velocity*: 2.1 ft./sec.
*Water Velocities were measured 2 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 1 ft.
Bankfull Width: 33 ft.
Wetted Width: 29 ft.
Water Velocity: 2 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 34 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Slope: Vertical
Slope: Vertical
Approaches
Left Approach
Length: 660 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.529
Erosion: 0.3924 tons/year
Right Approach
Length: 520 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.656
Erosion: 0.9679 tons/year
Erosion Information
Total Erosion at Crossing: 1.3603 tons/year
Extent of Erosion: Moderate
Summary Information
Erosion is an area of concern for this site.