Road Stream Crossing Site TBW_TBMO05

Thunder Bay River Watershed, tributary to Lake 15
Ryan Road
Briley Twp, Montmorency County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.98344 , -84.16847
T30N R2E Sec 23
Owned by State
Structure is NOT Perched
Total Erosion: 2.2593 tons/year
Severity: Moderate
Year Inventoried: 2017
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 2
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Multiple Culverts/Spans
1.5 ft.
34 ft.
1.5 ft.
1.5 ft.
34 ft.
1.5 ft.
Structure Interior: corrugated
Percentage Crushed: Inlet: 26% to 50% Outlet: 0% In Pipe: 0%
Structure is NOT Perched
Structure Inlet
Water Depth: 1.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.7 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.8 ft./sec.
*Water Velocities were measured 0.5 ft. below Surface (with Meter)
Additional Comments
Culvert length may have been ovvercalculated due to not resetting the equipment after measuring road width. Initial culvert width recorded was 56', but road width of 22' was subtracted to give us an actual culvert width estimation of 34'. This is not a priority site.
Stream Information
Stream Flow: Bankfull
Road Information
Gravel County Road
Road Condition: Fair
Road Width at Culvert: 22 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Fill Depth: 1.7 ft.
Slope: More than 1:2
Fill Depth: 1.8 ft.
Slope: More than 1:2
Left Approach
Length: 240 ft.
Slope: 1% to 5%
Vegetation: None
LS Factor: 0.626
Erosion: 0.9105 tons/year
Right Approach
Length: 315 ft.
Slope: 1% to 5%
Vegetation: None
LS Factor: 0.707
Erosion: 1.3488 tons/year
Erosion Information
Total Erosion at Crossing: 2.2593 tons/year
Extent of Erosion: Minor
Erosion is occurring and corrective actions can be installed to address the problem.
Notes: Road material reaching stream.
Summary Information