Road Stream Crossing Site AUS_RO009

Au Sable River Watershed, Tributary of East Creek
North St. Helen Rd
AuSable Twp, Roscommon County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.48279 , -84.41076
T24N R01W Sec 11
Owned by Private
State
Fish Passability 0
Structure is NOT Perched
Total Erosion: 1.206 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 2
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Fair
Multiple Culverts/Spans
Culvert/Span
Width
Length
Height
Material
2
2 ft.
50 ft.
2 ft.
Metal
Structure Interior: corrugated
Dimensions of Structure: Length 50 ft. , Width 2 ft. , Height 2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.5 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.07 ft./sec.
Structure Outlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 3.33 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Additional Comments
Private-west & state-east
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 24 ft. , Width 16 ft. , Depth 2.5 ft.
Upstream Pond: Length 19 ft. , Width 10 ft.
Riffle Information
Water Depth: 0.5 ft.
Bankfull Width: 20 ft.
Wetted Width: 13 ft.
Water Velocity: 0.74 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved State Road
Road Condition: Good
Road Width at Culvert: 32 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.1 ft.
Slope: 1:2
Downstream
Fill Depth: 4 ft.
Slope: 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.603 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.603 tons/year
Erosion Information
Total Erosion at Crossing: 1.206 tons/year
Extent of Erosion: Minor
Notes: Wooded embankments installed on both sides of crossing
Summary Information
Fish Passability 0
A future visit to this site is recommended. Upstream pond and a scour pool are both present. Also to replacec old wooded bank barriers.
These non-native species were observerd at this site: Spotted Knapweed