Road Stream Crossing Site AUS_CR086
Au Sable River Watershed, West Branch Big Creek
Townline Rd
Lovells Twp,
Crawford County
Information collected by:
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
Embankments
Upstream
Fill Depth: 5 ft.
Slope: More than 1:2
Downstream
Fill Depth: 4 ft.
Slope: More than 1:2
Approaches
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 | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Downstream |
52 ft. |
11 ft. |
1 ft. |
yes |
Silt |
0.3094 |
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