Road Stream Crossing Site BT_G020

Betsie River Watershed, Unknown (Near Tonowanda Lake)
Birch Rd
Green Lake Twp, Grand Traverse County
Information collected by:
GPS Coordinates: 44.6540344682253 , -85.7512736320496
T26N R12W Sec 15
Owned by Private
Structure is NOT Perched
Total Erosion: 2.0201 tons/year
Severity: Severe
Year Inventoried: 2014
Site Location
Inlet
Outlet
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Type of Crossing: culvert(s)
Number of Culverts: 2
Structure Shape: Round
Inlet Type: Projecting
Outlet Type: At Stream Grade
Structure Material: Metal
Structure Substrate: Mixture
General Conditions: Fair
Multiple Culverts/Spans
Culvert/Span
Width
Length
Height
Material
2
2 ft.
30 ft.
2 ft.
Metal
Structure Interior: corrugated
Dimensions of Structure: Length 30 ft. , Width 2 ft. , Height 2 ft.
Structure is NOT Perched
Structure Inlet
Water Depth: 1.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 0.4 ft./sec.
Structure Outlet
Water Depth: 0.8 ft.
Embedded Depth of Structure: 0 ft.
Water Velocity*: 1.8 ft./sec.
*Water Velocities were measured 1.3 ft. below Surface (with Meter)
Stream Information
Stream Flow: More than Bankfull
Scour Pool: Length 15 ft. , Width 12 ft. , Depth 1.5 ft.
Upstream Pond: Length 0 ft. , Width 0 ft. , Depth 0 ft.
Riffle Information
Water Depth: 0.3 ft.
Bankfull Width: 16 ft.
Wetted Width: 13 ft.
Water Velocity: 1.4 ft./sec. (Measured with Meter)
Dominant Substrate: Gravel
Road Information
Gravel County Road
Road Condition: Good
Road Width at Culvert: 17 ft.
Location of Low Point: Other
Runoff Path: Roadway
Embankments
Upstream
Fill Depth: 2.4 ft.
Slope: More than 1:2
Downstream
Fill Depth: 1.7 ft.
Slope: More than 1:2
Approaches
Left Approach
Length: 0 ft.
Slope: Less Than 1%
Vegetation: Heavy
LS Factor: 0.05
Erosion: 0 tons/year
Right Approach
Length: 175 ft.
Slope: 1% to 5%
Vegetation: Heavy
LS Factor: 0.415
Erosion: 0.3401 tons/year
Erosion Information
Total Erosion at Crossing: 2.0201 tons/year
Extent of Erosion: Severe
Notes:

Upstream/downstream roadway bank erosion.

Location of Erosion
Erosion Dimensions
Eroded Material
Material Eroded
Total Erosion
facing downstream
Length
Width
Depth
Reaching Stream?
(tons/year)
Left Downstream Embankment
15 ft.
4 ft.
4 ft.
yes
Gravelly Loam
0.42
Right Downstream Embankment
15 ft.
4 ft.
4 ft.
yes
Gravelly Loam
0.42
Left Upstream Embankment
15 ft.
8 ft.
4 ft.
yes
Gravelly Loam
0.42
Right Upstream Embankment
15 ft.
8 ft.
4 ft.
yes
Gravelly Loam
0.42
Summary Information
Erosion is an area of concern for this site.

High amount of erosion, mainly gravel from roadway.

A future visit to this site is recommended.

Erosion on banks/undersized culverts.