Road Stream Crossing Site AUS_RO015
Au Sable River Watershed, South Branch Au Sable River
Pine Dr
AuSable Twp,
Roscommon County
Information collected by:
Site Location
GPS Coordinates: 44.43758
, -84.46889
T24N
R01W
Sec 32
Owned by Private
Fish Passability 1
Structure is NOT Perched
Total Erosion: 3.2019 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Pipe Arch,Open Bottom Arch
Inlet Type: Headwall
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 40 ft.
, Width 27 ft.
, Height 7.3 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 4.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 4 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 80 ft.
, Width 200 ft.
Riffle Information
Water Depth: 2.1 ft.
Bankfull Width: 44 ft.
Wetted Width: 34 ft.
Water Velocity: 0 ft./sec.
(Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Fair
Road Width at Culvert: 33.5 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: 520 ft.
Slope: 6% to 10%
Vegetation: Partial
LS Factor: 2.294
Erosion: 1.321 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 0.886 tons/year
Erosion Information
Total Erosion at Crossing: 3.2019 tons/year
Extent of Erosion: Moderate
Erosion is occurring and corrective actions can be installed to address the problem.
Notes: From ditch into stream/eroding banck. Drainage pipes needed.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Ditch |
39 ft. |
5 ft. |
1.5 ft. |
yes |
Silt |
0.3481 |
Right Ditch |
24 ft. |
7 ft. |
3.5 ft. |
yes |
Sand |
0.6468 |
Summary Information
Fish Passability 1
A future visit to this site is recommended. Lot's of bank erosion, see erosion info.
These non-native species were observerd at this site: Spotted Knapweed, Queen Anne's Lace