Road Stream Crossing Site AUS_OT109

Au Sable River Watershed, North Branch Au Sable River
Ranger Lake Rd
Bagley Twp, Otsego County
Information collected by:
Huron Pines
Site Location
GPS Coordinates: 44.93206 , -84.60433
T29N R02W Sec 6
Owned by State
Fish Passability 0
Total Erosion: 6.988 tons/year
Severity: Severe
Year Inventoried: 2013
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 1
Structure Shape: Ellipse
Inlet Type: Apron
Outlet Type: Outlet Apron
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Good
Structure Interior: corrugated
Dimensions of Structure: Length 42 ft. , Width 4.9 ft. , Height 3.4 ft.
Percentage Crushed: In Pipe: 1% to 25%
Structure Inlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0.3 ft.
Water Velocity*: 3.077 ft./sec.
Structure Outlet
Water Depth: 0.7 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.02 ft./sec.
*Water Velocities were measured at the Surface (with Float Test)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 33 ft. , Width 25 ft. , Depth 3.4 ft.
Upstream Pond: Length 35 ft. , Width 45 ft.
Riffle Information
Water Depth: 1.1 ft.
Bankfull Width: 29 ft.
Wetted Width: 16 ft.
Water Velocity: 0.746 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: Ditch
Embankments
Upstream
Fill Depth: 3.1 ft.
Slope: Vertical
Downstream
Fill Depth: 3 ft.
Slope: 1:2
Approaches
Left Approach
Length: 400 ft.
Slope: 6% to 10%
Vegetation: Heavy
LS Factor: 1.53
Erosion: 4.0463 tons/year
Right Approach
Length: 800 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.55
Erosion: 2.9091 tons/year
Erosion Information
Total Erosion at Crossing: 6.988 tons/year
Extent of Erosion: Minor
Notes: Foot access and road grading erosion at the upstream and downstream ditches
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Ditch
20 ft.
2 ft.
1 ft.
yes
Sandy Loam
0.0192
Left Ditch
14 ft.
2 ft.
1 ft.
yes
Sandy Loam
0.0134
Summary Information
Fish Passability 0
Fish Passage is an area of concern for this site. High velocities and an enormous scour pool create fish passage difficulties
A future visit to this site is recommended. Realign culvert to a more natural alignment to allow adequate flow passage.
These non-native species were observerd at this site: Leafy Spurge, Spotted Knapweed, Reed Canarygrass, Bladder Campion

Close this Page

Print