Road Stream Crossing Site GTBAY_S481
Boardman River Watershed, N Branch Boardman River
N Broomhead Rd
Whitewater Twp,
Grand Traverse County
Information collected by:
Site Location
GPS Coordinates: 44.690068
, -85.36717
T27N
R9W
Sec 35
Owned by State
Fish Passability 0
Total Erosion: 0.3181 tons/year
Severity: Severe
Year Inventoried: 2020
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Other
Crossing Information
Type of Crossing: culvert(s)
Structure Shape: Pipe Arch
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Rock
General Conditions: Fair
Structure Interior: corrugated
Dimensions of Structure: Length 40 ft.
, Width 9.8 ft.
, Height 6.7 ft.
Structure Inlet
Water Depth: 3.2 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 3.3 ft./sec.
Structure Outlet
Water Depth: 2.3 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 4 ft./sec.
*Water Velocities were measured 1.9 ft. below Surface
(with Meter)
Stream Information
Stream Flow: Less than Bankfull
Scour Pool: Length 40 ft.
, Width 60 ft.
, Depth 6 ft.
Riffle Information
Water Depth: 2.1 ft.
Bankfull Width: 29 ft.
Wetted Width: 26 ft.
Water Velocity: 2 ft./sec.
(Measured with Meter)
Dominant Substrate: Sand
Road Information
Paved
County Road
Road Condition: Fair
Road Width at Culvert: 21 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 3 ft.
Slope: 1:1.5
Downstream
Fill Depth: 2.5 ft.
Slope: 1:2
Approaches
Left Approach
Length: 100 ft.
Slope: Less Than 1%
Vegetation: Partial
LS Factor: 0.05
Erosion: 0.0035 tons/year
Right Approach
Length: 150 ft.
Slope: 1% to 5%
Vegetation: Partial
LS Factor: 0.44
Erosion: 0.0458 tons/year
Erosion Information
Total Erosion at Crossing: 0.3181 tons/year
Extent of Erosion: Moderate
Location of Erosion | Erosion Dimensions | Eroded Material | Material Eroded | Total Erosion | ||
facing downstream | Length | Width | Depth | Reaching Stream? | (tons/year) | |
Left Downstream Embankment |
40 ft. |
1 ft. |
1 ft. |
yes |
Sandy Loam |
0.2688 |
Summary Information
Fish Passability 0
Erosion is an area of concern for this site.
A future visit to this site is recommended. Large scour pool, undersized culvert