Road Stream Crossing Site AUS_CR006
Au Sable River Watershed, Au Sable River
County Rd 612
Frederic Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.77816
, -84.76236
T28N
R04W
Sec 35
Owned by Private
Fish Passability 0.9
Total Erosion: 0.3529 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Bridge
Structure Shape: Open Bottom Square/Rectangle
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Concrete
Structure Substrate: Gravel
General Conditions: Fair
Structure Interior: smooth
Structure is Rusted through
Dimensions of Structure: Length 34 ft.
, Width 49 ft.
, Height 8.7 ft.
Structure Inlet
Water Depth: 1.3 ft.
Water Velocity*: 1.64 ft./sec.
Structure Outlet
Water Depth: 1.2 ft.
Water Velocity*: 1.312 ft./sec.
*Water Velocities were measured 0.4 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 48 ft.
, Width 34 ft.
, Depth 1.2 ft.
Riffle Information
Water Depth: 1.3 ft.
Bankfull Width: 71 ft.
Wetted Width: 61 ft.
Water Velocity: 1.57 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Poor
Road Width at Culvert: 30 ft.
Location of Low Point: Other
Runoff Path: Roadway
Fill Depth: 0 ft.
Slope: Vertical
Fill Depth: 0 ft.
Slope: Vertical
Approaches
Left Approach
Length: 0 ft.
Slope: 0%
Vegetation: Partial
LS Factor: 0.05
Erosion: 0 tons/year
Right Approach
Length: 290 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.456
Erosion: 0.1311 tons/year
Erosion Information
Total Erosion at Crossing: 0.3529 tons/year
Extent of Erosion: Moderate
Notes: Caused by foot traffic access to stream
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Approach |
96 ft. |
7 ft. |
0.3 ft. |
yes |
Sand |
0.2218 |
Summary Information
Fish Passability 0.9
A future visit to this site is recommended. Wing walls are slightly tilted/ deteriorated and the metal support walls are extremely rusted.