Road Stream Crossing Site CLHW_MC-011

Mill Creek Watershed, Unnamed
N Old Mackinaw Rd
Mackinaw Twp, Cheboygan County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 45.74054 , -84.65779
T39N R3W Sec 27
Owned by Private
Fish Passability 0
Perch Height: 2.5 ft.
Total Erosion: 1.1862 tons/year
Severity: Severe
Year Inventoried: 2016
Site ID
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Square/Rectangle
Inlet Type: Wingwall 30-70 Degree
Outlet Type: Freefall into Pool
Structure Material: Concrete
Structure Substrate: Gravel
General Conditions: Poor
Structure Interior: smooth
Dimensions of Structure: Length 43 ft. , Width 6 ft. , Height 4.5 ft.
Percentage Crushed: Inlet: 1% to 25% Outlet: 76% to 100%
Perch Height: 2.5 ft.
Structure Inlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0.1 ft.
Water Velocity*: 5 ft./sec.
Structure Outlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 5 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than 1/2 Bankfull
Scour Pool: Length 15 ft. , Width 16 ft. , Depth 2 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 12 ft.
Wetted Width: 8 ft.
Water Velocity: 2.9 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel County Road
Road Condition: Poor
Road Width at Culvert: 17 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 3.5 ft.
Slope: More than 1:2
Fill Depth: 6.3 ft.
Slope: 1:1.5
Left Approach
Length: 420 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.484
Erosion: 0.952 tons/year
Right Approach
Length: 1000 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.2342 tons/year
Erosion Information
Total Erosion at Crossing: 1.1862 tons/year
Summary Information
Fish Passability 0