Road Stream Crossing Site PLT-I-9

Platte River Watershed, Belt Lake Tributary
Bronson Lake Rd
Inland Twp, Benzie County
Information collected by:
GPS Coordinates: 44.68517 , -85.88402
T26 R13 Sec 4
Adjacent Land Owned by State
Severity: Severe
Cost: $150,000.00
Site Location
Upstream Conditions
Downstream Conditions
Road Approach - Left
Road Approach - Right
Crossing Information
Road Width at Culvert: 15 ft.
Road Surface: Sand
Maintenance: seasonal
Low Point: At Stream
Existing Drainage Control? no
Any Failings? no
Type of Crossing: culvert(s) (single culvert)
Is this crossing constricted? no
Are there adjacent wetlands? yes
Left Approach
Length: 509 ft.
Slope: 6-10%
Vegetation: partial
Right Approach
Length: 477 ft.
Slope: 6-10%
Vegetation: partial
Culvert Information
Length: 15 ft.
Diameter: 2 ft.
Material: galvanized
Condition :poor
Flow: clear
Fill Depth: 5.69999980926514 ft.
Embankment Slope: vertical
Fill Depth: 5.5 ft.
Embankment Slope: vertical
Stream Information
Stream Width: 9 ft.
Stream Depth: 0.9 in.
Stream Current: slow
Stream Substrate: sand
Stream Width: 11.75 ft.
Stream Depth: 0.4 in.
Stream Current: moderate
Stream Substrate: gravel
Erosion Information
Is there Streambank erosion beside the crossing? yes
Is there embankment erosion? yes
Is there erosion at the culvert outlet? no
Is there erosion at the shoulder and/or ditch? yes
Is there pooling at the outlet? yes
Is there sand over the crossing? no
Extent of Erosion: severe
Cause of Erosion: Extreme slope and lack of vegetation resulting in embankment and shoulder erosion. Recreational use (primarily horse trail) is causing bank erosion.
Recommended Treatments
Action Recommended? no
Add pavement? yes
Pave Left Approach: 0 Lineal Feet
Pave Right Approach: 0 Lineal Feet
Add paved raised edge? no
Number of erosion control structures: 0
Number of sediment basins: 0
Number of diversion outlets: 0
Increase fill? no
Replace culvert(s)? yes
Extend culvert(s)? no
Lineal feet to extend: 0
Other Treatments: Vegetate and add stabilizing riprap at horse access
Comments: Undersized culvert resulting in stream confinement, extreme embankment and bank erosion and failing structural stability of culvert.
Total Points:0
This page last updated on 2/9/2022.