Road Stream Crossing Site CLHW_BC-017
Big Creek Watershed, Big Creek
Walker Rd
Mason Twp,
Arenac County
Information collected by:
Site Location
GPS Coordinates: 44.10133
, -83.84753
T20N
R5E
Sec 27
Owned by Private
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 1.535 tons/year
Severity: Moderate
Year Inventoried: 2016
Site ID
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Gravel
General Conditions: New
Structure Interior: smooth
Dimensions of Structure: Length 28 ft.
, Width 42 ft.
, Height 8 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0.9 ft./sec.
Structure Outlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0.9 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Additional Comments
Gravel runs off of bridge and into stream
Stream Information
Stream Flow: Less than 1/2 Bankfull
Scour Pool: Length 14 ft.
, Width 16 ft.
, Depth 2.5 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 0.9 ft.
Bankfull Width: 18 ft.
Wetted Width: 13.7 ft.
Water Velocity: 1.4 ft./sec.
(Measured with Float Test)
Dominant Substrate: Cobble
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 22 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: More than 1:2
Fill Depth: 0 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 420 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.484
Erosion: 1.232 tons/year
Right Approach
Length: 1000 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.303 tons/year
Erosion Information
Total Erosion at Crossing: 1.535 tons/year
Summary Information
Fish Passability 0.9
Erosion is an area of concern for this site.
May need to revisit to survey erosion