Road Stream Crossing Site PM_M008
Pere Marquette River Watershed, Big South Branch Pere Marquette
Hawley Rd
Logan Twp,
Mason County
Information collected by:
Site Location
GPS Coordinates: 43.87009
, -86.07938
T17N
R15W
Sec 15
Owned by Federal
Fish Passability 0.9
Total Erosion: 0.091 tons/year
Severity: Moderate
Year Inventoried: 2014
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 21 ft.
, Width 40 ft.
Structure Inlet
Water Depth: 3.9 ft.
Water Velocity*: 0.4 ft./sec.
Structure Outlet
Water Depth: 2.8 ft.
Water Velocity*: 0.7 ft./sec.
*Water Velocities were measured 2 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than 1/2 Bankfull
Riffle Information
Water Depth: 0.4 ft.
Bankfull Width: 68 ft.
Wetted Width: 66 ft.
Water Velocity: 1.7 ft./sec.
(Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 21 ft.
Location of Low Point: Other
Runoff Path: Roadway
Approaches
Left Approach
Length: 120 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.042
Erosion: 0.0868 tons/year
Right Approach
Length: 120 ft.
Slope: Less Than 1%
Vegetation: None
LS Factor: 0.05
Erosion: 0.0042 tons/year
Erosion Information
Total Erosion at Crossing: 0.091 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.9