Road Stream Crossing Site BSAB_BS65
Big Sable River Watershed, Big Sable River
US-31
Grant Twp,
Mason County
Information collected by:
Site Location
GPS Coordinates: 44.12043
, -86.27991
T20N
R17W
Sec 24
Owned by Private
Fish Passability 0.5
Structure is NOT Perched
Total Erosion: 3.8109 tons/year
Severity: Severe
Year Inventoried: 2011
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: Mixture
General Conditions: Good
Structure Interior: smooth
Dimensions of Structure: Length 46 ft.
, Width 59 ft.
, Height 8.5 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 2.16 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.8 ft./sec.
Structure Outlet
Water Depth: 2.28 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.6 ft./sec.
*Water Velocities were measured 1.3 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 1.94 ft.
Bankfull Width: 75 ft.
Wetted Width: 69 ft.
Water Velocity: 1.9 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
Federal Road
Road Condition: Good
Road Width at Culvert: 44 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: 1:1
Fill Depth: 0 ft.
Slope: 1:1
Approaches
Left Approach
Length: 1000 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 2.05
Erosion: 2.9818 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.8291 tons/year
Erosion Information
Total Erosion at Crossing: 3.8109 tons/year
Summary Information
Fish Passability 0.5
These non-native species were observerd at this site: Knapweed