Road Stream Crossing Site AUS_CR068
Au Sable River Watershed, South Branch Au Sable River
Chase Bridge Rd
South Branch Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.5408
, -84.55053
T25N
R02W
Sec 22
Owned by Private
State
State
Fish Passability 0
Structure is NOT Perched
Total Erosion: 6.1103 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 10-30 Degree
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Rock
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 30.5 ft.
, Width 59 ft.
, Height 6.7 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.57 ft./sec.
Structure Outlet
Water Depth: 2.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.41 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 40 ft.
, Width 46 ft.
, Depth 4.5 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 3.2 ft.
Bankfull Width: 67 ft.
Wetted Width: 58.5 ft.
Water Velocity: 2.5 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Paved
County Road
Road Condition: Poor
Road Width at Culvert: 30 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Approaches
Left Approach
Length: 690 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.534
Erosion: 0.3651 tons/year
Right Approach
Length: 1000 ft.
Slope: More Than 10%
Vegetation: Heavy
LS Factor: 5.785
Erosion: 5.7372 tons/year
Erosion Information
Total Erosion at Crossing: 6.1103 tons/year
Extent of Erosion: Minor
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Downstream |
4 ft. |
10 ft. |
2 ft. |
no |
Gravel |
0.008 |
Summary Information
Fish Passability 0
A future visit to this site is recommended. To check scour pool