Road Stream Crossing Site AUS_CR086

Au Sable River Watershed, West Branch Big Creek
Townline Rd
Lovells Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.76904 , -84.42471
T27N R01W Sec 3
Owned by Private
Fish Passability 0.5
Structure is NOT Perched
Total Erosion: 47.3886 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Wingwall 30-70 Degree
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: smooth
Dimensions of Structure: Length 80 ft. , Width 20.3 ft. , Height 10.7 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.47 ft./sec.
Structure Outlet
Water Depth: 2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.63 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 68 ft. , Width 22 ft. , Depth 4 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 1.4 ft.
Bankfull Width: 32 ft.
Wetted Width: 28 ft.
Water Velocity: 1.9 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel County Road
Road Condition: Good
Road Width at Culvert: 30.5 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Fill Depth: 5 ft.
Slope: More than 1:2
Fill Depth: 4 ft.
Slope: More than 1:2
Left Approach
Length: 550 ft.
Slope: More Than 10%
Vegetation: Partial
LS Factor: 6.398
Erosion: 29.5642 tons/year
Right Approach
Length: 394 ft.
Slope: More Than 10%
Vegetation: Partial
LS Factor: 5.291
Erosion: 17.515 tons/year
Erosion Information
Total Erosion at Crossing: 47.3886 tons/year
Extent of Erosion: Moderate
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Left Downstream
52 ft.
11 ft.
1 ft.
Summary Information
Fish Passability 0.5
Fish Passage is an area of concern for this site. Beaver Dam upstream needs to be removed.
A future visit to this site is recommended. Remove Beaver dam. Flow is confined under bridge to a narrow width. A wider bridge would be better.
These non-native species were observerd at this site: Spotted Knapweed, Mullein, Bull Thistle, Queen Anne's Lace, Burdock