Road Stream Crossing Site AUS_RO019

Au Sable River Watershed, Tributary of South Branch Au Sable River
M-76
Higgins Twp, Roscommon County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.41941 , -84.47796
T23N R01W Sec 5
Owned by State
Fish Passability 0.9
Structure is NOT Perched
Total Erosion: 1.7516 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Round
Inlet Type: Apron
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 75 ft. , Width 2 ft. , Height 2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 0 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Riffle Information
Water Depth: 0.8 ft.
Bankfull Width: 16 ft.
Wetted Width: 11 ft.
Water Velocity: 0 ft./sec. (Measured with Float Test)
Dominant Substrate: Silt
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 41 ft.
Location of Low Point: At Stream
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 3.6 ft.
Slope: More than 1:2
Downstream
Fill Depth: 4 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7726 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.57
Erosion: 0.7726 tons/year
Erosion Information
Total Erosion at Crossing: 1.7516 tons/year
Extent of Erosion: Moderate
Notes: In ditch area just before culverts.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Ditch
40 ft.
23.6 ft.
0.4 ft.
yes
Gravel
0.112
Left Ditch
45 ft.
15 ft.
0.3 ft.
no
Gravel
0.0945
Summary Information
Fish Passability 0.9
These non-native species were observerd at this site: Spotted Knapweed, Canadian Thistle