Road Stream Crossing Site LM076
Manistee River Watershed, Little Manistee River
18 Mile Bridge on 11 Mile Rd
Elk Twp,
Lake County
Information collected by:
Site Location
GPS Coordinates: 44.145894
, -86.02478
T20N
R14W
Sec 7
Owned by Private
Fish Passability 0.5
Total Erosion: 0.1418 tons/year
Severity: Moderate
Year Inventoried: 2019
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: Wood
Structure Substrate: Mixture
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 32 ft.
, Width 53 ft.
, Height 13 ft.
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.7 ft./sec.
Structure Outlet
Water Depth: 3.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.7 ft./sec.
*Water Velocities were measured 1 ft. below Surface
(with Meter)
Additional Comments
Additional notes due to extreme flooding
Stream Information
Stream Flow: Bankfull
Riffle Information
Water Depth: 2 ft.
Bankfull Width: 30 ft.
Wetted Width: 30 ft.
Water Velocity: 2 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 30 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Approaches
Left Approach
Length: 300 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.46
Erosion: 0.1369 tons/year
Right Approach
Length: 100 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.005 tons/year
Erosion Information
Total Erosion at Crossing: 0.1418 tons/year
Summary Information
Fish Passability 0.5
These non-native species were observerd at this site: Autumn Olive and Knappweed