Road Stream Crossing Site AUS_RO020
Au Sable River Watershed, South Branch Au Sable River
M-76
Richfield Twp,
Roscommon County
Information collected by:
Site Location
GPS Coordinates: 44.41271
, -84.4633
T23N
R01W
Sec 5
Owned by State
Fish Passability 1
Structure is NOT Perched
Total Erosion: 1.9147 tons/year
Severity: Moderate
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: Sand
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 67 ft.
, Width 40 ft.
, Height 10.3 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 1.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 4 ft.
Bankfull Width: 46 ft.
Wetted Width: 36 ft.
Water Velocity: 0 ft./sec.
(Measured with Float Test)
Dominant Substrate: Silt
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 41 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: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7726 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7726 tons/year
Erosion Information
Total Erosion at Crossing: 1.9147 tons/year
Extent of Erosion: Moderate
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Downstream |
22 ft. |
8.5 ft. |
2.5 ft. |
yes |
Sandy Loam |
0.3696 |
Summary Information
Fish Passability 1
A future visit to this site is recommended. To assess erosion
These non-native species were observerd at this site: Spotted Knapweed, Mullein