Road Stream Crossing Site AUS_RO018
Au Sable River Watershed, Tributary of South Branch Au Sable River
M-76
Higgins Twp,
Roscommon County
Information collected by:
Site Location
GPS Coordinates: 44.42043
, -84.48016
T23N
R01W
Sec 6
Owned by State
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 2.1262 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Apron
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 83 ft.
, Width 2 ft.
, Height 2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 1.1 ft.
Bankfull Width: 11 ft.
Wetted Width: 5 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: 40 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.6 ft.
Slope: More than 1:2
Downstream
Fill Depth: 4 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.0579 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.0579 tons/year
Erosion Information
Total Erosion at Crossing: 2.1262 tons/year
Extent of Erosion: Minor
Notes: Road Shoulder erosion
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Ditch |
15 ft. |
20 ft. |
0.3 ft. |
no |
Gravel |
0.0045 |
Left Ditch |
20 ft. |
20 ft. |
0.3 ft. |
no |
Gravel |
0.006 |
Summary Information
Fish Passability 0.9
These non-native species were observerd at this site: Spotted Knapweed