Road Stream Crossing Site AUS_OS003
Au Sable River Watershed, East Branch Big Creek
Farrington Rd
Greenwood Twp,
Oscoda County
Information collected by:
Site Location
GPS Coordinates: 44.78321
, -84.30444
T28N
R01E
Sec 27
Owned by State
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 30.5094 tons/year
Severity: Severe
Year Inventoried: 2013
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 28 ft.
, Width 3 ft.
, Height 3.2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.86 ft./sec.
Structure Outlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.3227 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 20 ft.
, Width 14.5 ft.
, Depth 2.3 ft.
Riffle Information
Water Depth: 0.9 ft.
Bankfull Width: 16 ft.
Wetted Width: 11 ft.
Water Velocity: 1.961 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel
County Road
Road Condition: Good
Road Width at Culvert: 18 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 1.5 ft.
Slope: 1:2
Downstream
Fill Depth: 2 ft.
Slope: 1:2
Approaches
Left Approach
Length: 650 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.528
Erosion: 1.7002 tons/year
Right Approach
Length: 1000 ft.
Slope: More Than 10%
Vegetation: Heavy
LS Factor: 5.785
Erosion: 28.686 tons/year
Erosion Information
Total Erosion at Crossing: 30.5094 tons/year
Extent of Erosion: Moderate
Erosion is occurring and corrective actions can be installed to address the problem.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Ditch |
4 ft. |
14 ft. |
4 ft. |
yes |
Sand |
0.1232 |
Summary Information
Fish Passability 0.9
Fish Passage is an area of concern for this site.
Culvert has no embedded substrate and alignment issues with culvert could account for scour pool.
A future visit to this site is recommended. To realign culvert, need for gravel substrate?, and to assess erosion on upstream bank.
These non-native species were observerd at this site: Spotted Knapweed, White Sweet Cover, Oxeye Daisy, Mullein