Road Stream Crossing Site PM_L055

Pere Marquette River Watershed, Middle Branch
Queens Hwy
Yates Twp, Lake County
Information collected by:
Site Location
GPS Coordinates: 43.85818 , -85.70177
T17N R12W Sec 23
Owned by Private
Federal
Total Erosion: 3.1215 tons/year
Severity: Severe
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: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 17 ft. , Width 22 ft. , Height 7.5 ft.
Structure Inlet
Water Depth: 2.1 ft.
Water Velocity*: 1.2 ft./sec.
Structure Outlet
Water Depth: 1.4 ft.
Water Velocity*: 1.5 ft./sec.
*Water Velocities were measured 0.5 ft. below Surface (with Meter)
Additional Comments

Asphalt over bridge.

Stream Information
Stream Flow: Less than 1/2 Bankfull
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 25 ft.
Wetted Width: 18 ft.
Water Velocity: 1.1 ft./sec. (Measured with Meter)
Dominant Substrate: Sand
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 17 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Slope: Vertical
Slope: Vertical
Approaches
Left Approach
Length: 325 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.433
Erosion: 2.1803 tons/year
Right Approach
Length: 400 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.48
Erosion: 0.8992 tons/year
Erosion Information
Total Erosion at Crossing: 3.1215 tons/year
Extent of Erosion: Minor
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Approach
200 ft.
1 ft.
0.1 ft.
yes
Sand
0.022
Left Approach
200 ft.
1 ft.
0.1 ft.
yes
Gravel
0.02
Summary Information
Erosion is an area of concern for this site.

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