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:
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
Embankments
Upstream
Fill Depth: 1.2 ft.
Slope: More than 1:2
Downstream
Fill Depth: 3 ft.
Slope: More than 1:2
Approaches
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 | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Right Ditch |
225 ft. |
6.5 ft. |
1 ft. |
yes |
Gravel |
4.5 |
Left Ditch |
32 ft. |
11 ft. |
1 ft. |
yes |
Gravel |
0.64 |
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