Road Stream Crossing Site PM_L002
Pere Marquette River Watershed, Pere Marquette River
South Branch Rd
Sweetwater Twp,
Lake County
Information collected by:
Site Location
GPS Coordinates: 43.9292176806998
, -86.0194328427315
T18N
R14W
Sec 30
Owned by Federal
Total Erosion: 0.8998 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: Good
Multiple Culverts/Spans | ||||
Culvert/Span | Width | Length | Height | Material |
1 |
37 ft. |
28.3 ft. |
14 ft. |
Concrete |
2 |
40 ft. |
28.3 ft. |
14 ft. |
Concrete |
3 |
39 ft. |
28.3 ft. |
14 ft. |
Concrete |
Structure Interior: smooth
Dimensions of Structure: Length 28.3 ft.
, Width 116 ft.
, Height 14 ft.
Structure Inlet
Water Depth: 2.5 ft.
Water Velocity*: 3.4 ft./sec.
Structure Outlet
Water Depth: 2.2 ft.
Water Velocity*: 4.2 ft./sec.
*Water Velocities were measured 1.5 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 2.5 ft.
Bankfull Width: 75 ft.
Wetted Width: 61.5 ft.
Water Velocity: 2.1 ft./sec.
(Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 24 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Slope: Vertical
Slope: Vertical
Approaches
Left Approach
Length: 260 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.444
Erosion: 0.0916 tons/year
Right Approach
Length: 575 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.714
Erosion: 0.7818 tons/year
Erosion Information
Total Erosion at Crossing: 0.8998 tons/year
Extent of Erosion: Minor
Erosion is occurring and corrective actions can be installed to address the problem.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Upstream Streambank |
20 ft. |
8 ft. |
1.5 ft. |
yes |
Loam |
0.0264 |
Summary Information
Erosion is an area of concern for this site.