Road Stream Crossing Site GTBAY_BRD008

Boardman River Watershed, Boardman River
Supply Road 660
Union Twp, Grand Traverse County
Information collected by:
Site Location
GPS Coordinates: 44.674675 , -85.396036
T26N R9W Sec 04
Owned by Private
Fish Passability 0
Total Erosion: 0.0808 tons/year
Severity: Severe
Year Inventoried: 2020
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Erosion
Crossing Information
Type of Crossing: culvert(s)
Number of Structures: 2
Structure Shape: Pipe Arch
Inlet Type: Mitered
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: None
General Conditions: Fair
Multiple Culverts/Spans
Culvert/Span
Width
Length
Height
Material
1
11.4 ft.
61 ft.
7.5 ft.
Metal
2
11.4 ft.
61 ft.
7.5 ft.
Metal
Structure Interior: corrugated
Dimensions of Structure: Length 61 ft. , Width 11.4 ft. , Height 7.5 ft.
Structure Inlet
Water Depth: 2.1 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 5.5 ft./sec.
Structure Outlet
Water Depth: 2.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4.8 ft./sec.
*Water Velocities were measured 1.3 ft. below Surface (with Meter)
Additional Comments
Water depth and velocity measurements recoreded for culvert #2
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 35 ft. , Width 35 ft. , Depth 5 ft.
Riffle Information
Water Depth: 2.8 ft.
Bankfull Width: 30 ft.
Wetted Width: 26 ft.
Water Velocity: 2.4 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Paved County Road
Road Condition: Good
Road Width at Culvert: 32 ft.
Location of Low Point: Other
Runoff Path: Ditch
Embankments
Upstream
Fill Depth: 2 ft.
Slope: 1:1.5
Downstream
Fill Depth: 2 ft.
Slope: 1:1.5
Approaches
Left Approach
Length: 75 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0.004 tons/year
Right Approach
Length: 150 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.4
Erosion: 0.0635 tons/year
Erosion Information
Total Erosion at Crossing: 0.0808 tons/year
Extent of Erosion: Minor
Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Right Upstream Embankment
2 ft.
1 ft.
7 ft.
yes
Sandy Loam
0.0134
Summary Information
Fish Passability 0