Road Stream Crossing Site AUS_PR120

Au Sable River Watershed, Backus Creek
Fowler Rd
Gustin Twp, Alcona County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.6267 , -83.49667
T26N R08E Sec 20,29
Owned by Private
Fish Passability 0
Structure is NOT Perched
Total Erosion: 0.9098 tons/year
Severity: Severe
Year Inventoried: 2012
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Pipe Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 45 ft. , Width 13 ft. , Height 8.1 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.5 ft./sec.
Structure Outlet
Water Depth: 0.4 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.5 ft./sec.
*Water Velocities were measured at the Surface (with Meter)
Additional Comments
It looks like the outlet has been intentionally dammed by people, there is a dam of rocks piled several stones deep, about 1'-1&1/2' tall, right before the end of the culvert. This has sped up the water and created a scour pol below the outlet. The culvert itself seemed large enough and was not speeding up the water-the pool appears to be a result of the dam.
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 37 ft. , Width 36 ft. , Depth 3.6 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 24.9 ft.
Wetted Width: 17.8 ft.
Water Velocity: 1.4 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved County Road
Road Condition: Fair
Road Width at Culvert: 24.5 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 2 ft.
Slope: 1:2
Downstream
Fill Depth: 2 ft.
Slope: 1:2
Approaches
Left Approach
Length: 975 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.568
Erosion: 0.4481 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.4617 tons/year
Erosion Information
Total Erosion at Crossing: 0.9098 tons/year
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site. The dam that has been placed in the culvert is speeding up water so that it could be a fish passage barrier, going faster than 3ft/s.
A future visit to this site is recommended. To evaluate the dam and the scour pool.