Road Stream Crossing Site AUS_RO033
Au Sable River Watershed, Tributary of Lake St. Helen
Russel Lake Rd
Markey Twp,
Roscommon County
Information collected by:
Site Location
GPS Coordinates: 44.35623
, -84.50089
T23N
R02W
Sec 25
Owned by Private
Fish Passability 0.5
Total Erosion: 6.6237 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 2
Structure Shape: Ellipse
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Multiple Culverts/Spans | ||||
Culvert/Span | Width | Length | Height | Material |
1 |
6 ft. |
34 ft. |
4.1 ft. |
Metal |
Structure Interior: corrugated
Dimensions of Structure: Length 34 ft.
, Width 6 ft.
, Height 4 ft.
Structure Inlet
Water Depth: 0.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.114 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.105 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 29 ft.
, Width 35 ft.
, Depth 3.4 ft.
Riffle Information
Water Depth: 0.9 ft.
Bankfull Width: 20 ft.
Wetted Width: 13.5 ft.
Water Velocity: 0.242 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel
County Road
Road Condition: Good
Road Width at Culvert: 20 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.3 ft.
Slope: Vertical
Downstream
Fill Depth: 2 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 3.1405 tons/year
Right Approach
Length: 716 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.537
Erosion: 2.12 tons/year
Erosion Information
Total Erosion at Crossing: 6.6237 tons/year
Extent of Erosion: Severe
Erosion is occurring and corrective actions can be installed to address the problem.
Notes: Severe erosion over culverts and bankstream erosion upstream and downstream. Plus, undercut banks caused by scour pool.
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Ditch |
7 ft. |
18 ft. |
4 ft. |
yes |
Gravel |
0.56 |
Right Streambank |
15.5 ft. |
7 ft. |
2.3 ft. |
yes |
Gravel |
0.713 |
Right Ditch |
4.7 ft. |
3.5 ft. |
1 ft. |
yes |
Sandy Loam |
0.0902 |
Summary Information
Fish Passability 0.5
Erosion is an area of concern for this site.
Erosion can be dealt with by placing riprap around culverts and by revegetating the banks. Plus, woody vegetation can be used where undercut banks are evident.
A future visit to this site is recommended. Erosion needs to be dealt with
These non-native species were observerd at this site: Spotted Knapweed, Queen Anne's Lace, Canada Thistle