Road Stream Crossing Site AUS_RO021
Au Sable River Watershed, Tributary of South Branch Au Sable River
M-76
Richfield Twp,
Roscommon County
Information collected by:
Site Location
GPS Coordinates: 44.40946
, -84.43629
T23N
R01W
Sec 5
Owned by State
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 1.7805 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: Sand
General Conditions: Poor
Structure Interior: corrugated
Dimensions of Structure: Length 72 ft.
, Width 2.2 ft.
, Height 2.2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0.2 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
Scour Pool: Length 10 ft.
, Width 12 ft.
, Depth 0.9 ft.
Upstream Pond: Length 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 0.4 ft.
Bankfull Width: 13 ft.
Wetted Width: 7 ft.
Water Velocity: 0 ft./sec.
(Measured with Float Test)
Dominant Substrate: Organics
Road Information
Paved
County Road
Road Condition: Good
Road Width at Culvert: 39 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3 ft.
Slope: More than 1:2
Downstream
Fill Depth: 2 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.0314 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7349 tons/year
Erosion Information
Total Erosion at Crossing: 1.7805 tons/year
Extent of Erosion: Minor
Notes: From common roadway traffic
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Ditch |
39 ft. |
15 ft. |
0.2 ft. |
no |
Gravel |
0.0078 |
Right Ditch |
32 ft. |
16 ft. |
0.2 ft. |
no |
Gravel |
0.0064 |
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. To fix damaged culvert
These non-native species were observerd at this site: Spotted Knapweed