Road Stream Crossing Site AUS_RO010

Au Sable River Watershed, East Creek
North St. Helen Rd
AuSable Twp, Roscommon County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.48496 , -84.41076
T24N R01W Sec 11
Owned by Private
State
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 1.2625 tons/year
Severity: Moderate
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: Good
Multiple Culverts/Spans
Culvert/Span
Width
Length
Height
Material
1
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: 1.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.19 ft./sec.
Structure Outlet
Water Depth: 0.5 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 1.948 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 19 ft. , Width 12 ft. , Depth 2 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 0.4 ft.
Bankfull Width: 24 ft.
Wetted Width: 21 ft.
Water Velocity: 1.361 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved State Road
Road Condition: Good
Road Width at Culvert: 33.5 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.2 ft.
Slope: 1:2
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: 0.6312 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.6312 tons/year
Erosion Information
Total Erosion at Crossing: 1.2625 tons/year
Extent of Erosion: Minor
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Culverts could be realigned to account for the scour pool