Road Stream Crossing Site LTB-027

Little Traverse Bay Watershed, Five Mile Creek
Lower Shore Dr
West Traverse Twp, Emmet County
Information collected by:
Tip of the Mitt Watershed Council
Site Location
GPS Coordinates: 45.46570914 , -85.07517534
Perch Height: 0.25 ft.
Total Erosion: 6.3339 tons/year
Severity: Severe
Year Inventoried: 2014
Inlet
Upstream Conditions
Outlet
Road Approach - Right
Road Approach - Left
Downstream Conditions
Other
Other
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: Freefall into Pool
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 33 ft. , Width 6 ft. , Height 6 ft.
Perch Height: 0.25 ft.
Structure Inlet
Water Depth: 0.25 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.8 ft./sec.
Structure Outlet
Water Depth: 0.25 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 9.2 ft./sec.
*Water Velocities were measured at the Surface (with Meter)
Additional Comments
Old site ID: FM-3.
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 15 ft. , Width 15 ft. , Depth 2.66 ft.
Riffle Information
Water Depth: 0.66 ft.
Bankfull Width: 6.17 ft.
Wetted Width: 6.17 ft.
Water Velocity: 3.42 ft./sec. (Measured with Meter)
Dominant Substrate: Cobble
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 25 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 7 ft.
Slope: 1:1
Downstream
Fill Depth: 10 ft.
Slope: Vertical
Approaches
Left Approach
Length: 350 ft.
Slope: More Than 10%
Vegetation: None
LS Factor: 6.29
Erosion: 1.8194 tons/year
Right Approach
Length: 200 ft.
Slope: 6% to 10%
Vegetation: None
LS Factor: 1.72
Erosion: 0.2843 tons/year
Erosion Information
Total Erosion at Crossing: 6.3339 tons/year
Extent of Erosion: Moderate
Erosion is occurring and corrective actions can be installed to address the problem.
Notes: Bank stabilization can mitigate further erosion of embankments. Stream bank vegetation cut on downstream side. Streambank vegetation cut on downstream side.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Left Downstream Embankment
70 ft.
10 ft.
6.17 ft.
yes
Silt
2.5698
Right Downstream Embankment
70 ft.
10 ft.
6.17 ft.
yes
Silt
2.5698
Left Upstream Embankment
60 ft.
12.5 ft.
6.25 ft.
no
Left Upstream Embankment
60 ft.
12.5 ft.
6.25 ft.
no
Summary Information
Erosion is an area of concern for this site. Perched culvert prevents fish passage; severe erosion.
A future visit to this site is recommended. Erosion