Road Stream Crossing Site LM058
Manistee River Watershed, Little Manistee River
Johnson Bridge, Johnson Rd/ 8 Mile Rd
Elk Twp,
Lake County
Information collected by:
Site Location
GPS Coordinates: 44.10537
, -85.927329
T20N
R14W
Sec 24
Owned by Private
Fish Passability 0
Total Erosion: 0.2593 tons/year
Severity: Severe
Year Inventoried: 2019
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 3
Structure Shape: Ellipse
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Fair
Multiple Culverts/Spans | ||||
Culvert/Span | Width | Length | Height | Material |
1 |
9.7 ft. |
42 ft. |
6.7 ft. |
Metal |
2 |
9.7 ft. |
42 ft. |
6.7 ft. |
Metal |
3 |
9.7 ft. |
42 ft. |
6.7 ft. |
Metal |
Structure Interior: corrugated
Dimensions of Structure: Length 42 ft.
, Width 9.7 ft.
, Height 6.7 ft.
Structure Inlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.6 ft./sec.
Structure Outlet
Water Depth: 1.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.6 ft./sec.
*Water Velocities were measured 1.7 ft. below Surface
(with Meter)
Additional Comments
Additional notes due to extreme flooding; values from culvert 2
Stream Information
Stream Flow: Bankfull
Riffle Information
Water Depth: 1.8 ft.
Bankfull Width: 47 ft.
Wetted Width: 47 ft.
Water Velocity: 1.5 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 22 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.5 ft.
Slope: 1:2
Downstream
Fill Depth: 1.5 ft.
Slope: 1:2
Approaches
Left Approach
Length: 350 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.47
Erosion: 0.1196 tons/year
Right Approach
Length: 400 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.48
Erosion: 0.1396 tons/year
Erosion Information
Total Erosion at Crossing: 0.2593 tons/year
Summary Information
Fish Passability 0