Road Stream Crossing Site AUS_CR021
Au Sable River Watershed, East Branch Au Sable River
West Karen Lake Rd
Grayling Twp,
Crawford County
Information collected by:
Site Location
GPS Coordinates: 44.72826
, -84.64404
T27N
R03W
Sec 23
Owned by Private
State
State
Fish Passability 0.9
Total Erosion: 1.6559 tons/year
Severity: Moderate
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Round
Inlet Type: Other
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Gravel
General Conditions: Poor
Structure Interior: corrugated
Dimensions of Structure: Length 22.5 ft.
, Width 4.8 ft.
, Height 2.9 ft.
Structure Inlet
Water Depth: 3 ft.
Embedded Depth of Structure: 2.7 ft.
Water Velocity*: 1.3 ft./sec.
Structure Outlet
Water Depth: 1.9 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.6 ft./sec.
*Water Velocities were measured at the Surface
(with Float Test)
Additional Comments
State land to the north of crossing and private to the south
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 31 ft.
, Width 30 ft.
, Depth 3.2 ft.
Upstream Pond: Length 43 ft.
, Width 39 ft.
Riffle Information
Water Depth: 1.9 ft.
Bankfull Width: 32 ft.
Wetted Width: 27 ft.
Water Velocity: 2.22 ft./sec.
(Measured with Float Test)
Dominant Substrate: Gravel
Road Information
Gravel
County Road
Road Condition: Fair
Road Width at Culvert: 20 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2.7 ft.
Slope: Vertical
Downstream
Fill Depth: 2 ft.
Slope: Vertical
Length: 0 ft.
Slope: 0%
Vegetation: Heavy
LS Factor: 0
Erosion: 0 tons/year
Right Approach
Length: 582 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.516
Erosion: 1.6559 tons/year
Erosion Information
Total Erosion at Crossing: 1.6559 tons/year
Extent of Erosion: Minor
Notes: Erosion mostly from the dirt road. Sandbags on bridge are not holding back all of the road erosion.
Summary Information
Fish Passability 0.9
Fish Passage is an area of concern for this site.
Culverts are obstructing stream flow.
A future visit to this site is recommended. 4 culverts are in very poor condition and are greatly reducing stream velocities upstream.
These non-native species were observerd at this site: Spotted Knapweed