Road Stream Crossing Site AUS_CR078
Au Sable River Watershed, Tributary of Au Sable River
Connor's Flats Rd
South Branch Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.67144
, -84.4121
T26N
R01W
Sec 3
Owned by Private
Fish Passability 0
Perch Height: 1.3 ft.
Total Erosion: 6.8758 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 40.7 ft.
, Width 2.5 ft.
, Height 2.5 ft.
Perch Height: 1.3 ft.
Structure Inlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4 ft./sec.
Structure Outlet
Water Depth: 0.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 2.5 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 0 ft.
, Width 0 ft.
, Depth 0 ft.
Riffle Information
Water Depth: 0.2 ft.
Bankfull Width: 9 ft.
Wetted Width: 3 ft.
Water Velocity: 1.34 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel
County Road
Road Condition: Good
Road Width at Culvert: 24 ft.
Location of Low Point: At Stream
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 3.5 ft.
Slope: 1:2
Downstream
Fill Depth: 4 ft.
Slope: 1:1.5
Approaches
Left Approach
Length: 377 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.589
Erosion: 1.4669 tons/year
Right Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 5.2893 tons/year
Erosion Information
Total Erosion at Crossing: 6.8758 tons/year
Extent of Erosion: Moderate
Notes: Erosion from grading
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Ditch |
25 ft. |
5.5 ft. |
0.5 ft. |
no |
Sand |
0.0963 |
Left Upstream |
5.2 ft. |
23 ft. |
0.3 ft. |
no |
Gravel |
0.0109 |
Left Downstream |
8.9 ft. |
12 ft. |
0.2 ft. |
yes |
Gravel |
0.0125 |
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site.
Perched outlet and fast water velocities. No substrate in culvert.
A future visit to this site is recommended. Account for perched outlet and realignment to decrease water velocities in culvert.
These non-native species were observerd at this site: Autumn Olive, Burdock