Road Stream Crossing Site AUS_CR079

Au Sable River Watershed, Tributary of Au Sable River
McMaster's Bridge Rd
South Branch Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.66126 , -84.39927
T26N R01W Sec 11
Owned by Private
Fish Passability 0
Perch Height: 0.7 ft.
Total Erosion: 1.4917 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Apron
Outlet Type: Freefall onto Riprap
Structure Material: Metal
Structure Substrate: None
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 92 ft. , Width 3 ft. , Height 3.1 ft.
Perch Height: 0.7 ft.
Structure Inlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.76 ft./sec.
Structure Outlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 5.17 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 4 ft. , Width 6.7 ft. , Depth 0.5 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 10 ft.
Wetted Width: 4.3 ft.
Water Velocity: 1 ft./sec. (Measured with Float Test)
Dominant Substrate: Cobble
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 54.5 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 5.8 ft.
Slope: More than 1:2
Fill Depth: 5 ft.
Slope: 1:1.5
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.4413 tons/year
Right Approach
Length: 0 ft.
Slope: Less Than 1%
Vegetation: Partial
LS Factor: 0.05
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 1.4917 tons/year
Extent of Erosion: Moderate
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Right Streambank
14.4 ft.
5 ft.
0.5 ft.
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site. And Erosion. Lot's of eroded riprap, high water velocities throughout culvert, no substrate in culvert, and .7 foot perch height.
A future visit to this site is recommended. Installation of new culvert, to allow fish passage. It's small, but high quality tributary to the Au Sable, a valuable nursery to juvenille fish.
These non-native species were observerd at this site: Leafy Spurge, Spotted Knapweed