Road Stream Crossing Site PM_M003
Pere Marquette River Watershed, Big South Branch Pere Marquette
Walhalla Rd
Logan Twp,
Mason County
Information collected by:
Site Location
GPS Coordinates: 43.87568
, -86.1137
T17N
R15W
Sec 9
Owned by Federal
Fish Passability 0.9
Total Erosion: 0.2764 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: Good
Dimensions of Structure: Length 30 ft.
, Width 108 ft.
, Height 15 ft.
Structure Inlet
Water Depth: 2.1 ft.
Water Velocity*: 1.6 ft./sec.
Structure Outlet
Water Depth: 2.8 ft.
Water Velocity*: 0.9 ft./sec.
*Water Velocities were measured 1.5 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than 1/2 Bankfull
Riffle Information
Water Depth: 1.9 ft.
Bankfull Width: 47 ft.
Wetted Width: 45 ft.
Water Velocity: 2 ft./sec.
(Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 29 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Approaches
Left Approach
Length: 410 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.482
Erosion: 0.1895 tons/year
Right Approach
Length: 210 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.432
Erosion: 0.087 tons/year
Erosion Information
Total Erosion at Crossing: 0.2764 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.9