Road Stream Crossing Site AUS_RO028

Au Sable River Watershed, Cedar Creek
M-76
Richfield Twp, Roscommon County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.38296 , -84.4254
T23N R01W Sec 15
Owned by Private
State
Fish Passability 0.9
Total Erosion: 1.9021 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 10-30 Degree
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Sand
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 66 ft. , Width 32.5 ft. , Height 6 ft.
Structure Inlet
Water Depth: 1.9 ft.
Water Velocity*: 0.4 ft./sec.
Structure Outlet
Water Depth: 1.4 ft.
Water Velocity*: 0.28 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Upstream Pond: Length 200 ft. , Width 100 ft.
Riffle Information
Water Depth: 1.2 ft.
Bankfull Width: 34 ft.
Wetted Width: 26 ft.
Water Velocity: 0.395 ft./sec. (Measured with Float Test)
Dominant Substrate: Sand
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 42 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: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7914 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.1107 tons/year
Erosion Information
Total Erosion at Crossing: 1.9021 tons/year
Extent of Erosion: Moderate
Erosion is occurring and corrective actions can be installed to address the problem.
Notes: Trail made from previous boat/ canoe launch access.
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Sparse vegetation on right approach due too dense spotted knapweed/allelopathy. Need to be removed.
These non-native species were observerd at this site: Spotted Knapweed, Mullein, Queen Anne's Lace

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