Road Stream Crossing Site PLT-I-9

Platte River Watershed, Belt Lake Tributary

Bronson Lake Rd

Inland Twp, Benzie County

GPS Coordinates: 44.68517 , -85.88402

T26 R13 Sec 4

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

Length: 509 ft.

Slope: 6-10%

Vegetation: partial

Length: 477 ft.

Slope: 6-10%

Vegetation: partial

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 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

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.

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