Road Stream Crossing Site AUS_CR075

Au Sable River Watershed, Douglas Creek
River Lake Rd
South Branch Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.55733 , -84.45137
T25N R01W Sec 16
Owned by Federal
Fish Passability 0.5
Structure is NOT Perched
Total Erosion: 10.4075 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Trash Rack
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 30 ft. , Width 2 ft. , Height 2.2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.65 ft./sec.
Structure Outlet
Water Depth: 0.6 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.83 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Upstream Pond: Length 61 ft. , Width 81 ft.
Riffle Information
Water Depth: 0.4 ft.
Bankfull Width: 12 ft.
Wetted Width: 5.5 ft.
Water Velocity: 2.67 ft./sec. (Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Sand County Road
Road Condition: Fair
Road Width at Culvert: 15.5 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Fill Depth: 2.5 ft.
Slope: 1:2
Fill Depth: 2 ft.
Slope: 1:2
Left Approach
Length: 1000 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 2.05
Erosion: 8.7534 tons/year
Right Approach
Length: 720 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.538
Erosion: 1.654 tons/year
Erosion Information
Total Erosion at Crossing: 10.4075 tons/year
Extent of Erosion: Minor
Notes: Build up of roadway materials along edge due to grading by Road Commision.
Summary Information
Fish Passability 0.5
Fish Passage is an area of concern for this site. Trash Rack upstream side.
A future visit to this site is recommended. Check trash rack for plugging
These non-native species were observerd at this site: Spotted Knapweed