Road Stream Crossing Site AUS_CR044

Au Sable River Watershed, Tributary of Au Sable River
North Down River Rd
Grayling Twp, Crawford County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.68453 , -84.66886
T26N R03W Sec 4
Owned by Private
Fish Passability 0
Total Erosion: 6.1635 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: Other
Structure Shape: Round
Inlet Type: Apron
Outlet Type: Outlet Apron
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 55.5 ft. , Width 1.7 ft. , Height 1.7 ft.
Structure Inlet
Water Depth: 0.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.45 ft./sec.
Structure Outlet
Water Depth: 1.3 ft.
Embedded Depth of Structure: 0.2 ft.
Water Velocity*: 0.05 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 27 ft. , Width 28 ft. , Depth 2.3 ft.
Riffle Information
Water Depth: 0.7 ft.
Bankfull Width: 23 ft.
Wetted Width: 16 ft.
Water Velocity: 0.27 ft./sec. (Measured with Float Test)
Dominant Substrate: Organics
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 38.7 ft.
Location of Low Point: Other
Runoff Path: Ditch
Fill Depth: 1.2 ft.
Slope: More than 1:2
Fill Depth: 3 ft.
Slope: More than 1:2
Left Approach
Length: 1000 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.8
Erosion: 1.0235 tons/year
Length: 0 ft.
Slope: 0%
Vegetation: Partial
LS Factor: 0
Erosion: 0 tons/year
Erosion Information
Total Erosion at Crossing: 6.1635 tons/year
Extent of Erosion: Severe
Notes: Erosion from sides of road into stream and over culvert on downstream right and upstream left approaches.
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Reaching Stream?
Right Ditch
225 ft.
6.5 ft.
1 ft.
Left Ditch
32 ft.
11 ft.
1 ft.
Summary Information
Fish Passability 0
Erosion is an area of concern for this site. Badly eroded road shoulder above culverts and a scour pool on the downstream side over the height of the culvert.
A future visit to this site is recommended. Revegetate the shoulder and curb erosion.
These non-native species were observerd at this site: Spotted Knapweed