Road Stream Crossing Site S721

Boardman River Watershed, Boardman River

Brown Bridge Rd

Crossing: Brown Bridge Road / Boardman River

Grand Traverse County

GPS Coordinates: 44.65169 , -85.45515

Road Width at Culvert: 15 ft.

Road Surface: Paved

Maintenance: year around

Low Point: 130 feet N of crossing

Existing Drainage Control? yes

Any Failings? yes

Type of Crossing: culvert(s) (twin culvert)

Is this crossing constricted? yes

Are there adjacent wetlands? yes

Comments: culverts are angle-cut (24 feet long at top, 40 feet long at water level)

Slope: 6-10%

Vegetation: partial

Slope: 0%

Vegetation: partial

Shape: round

Length: 40 ft.

Diameter: 16 ft diameter each ft.

Material: galvanized

Condition :good

Flow: clear

Fill Depth: 1 ft.

Embankment Slope: 1.5:1 slope

Fill Depth: 1 ft.

Embankment Slope: 1.5:1 slope

Stream Width: 40 ft.

Stream Depth: 24 in.

Stream Current: moderate

Stream Substrate: gravel

Stream Width: 40 ft.

Stream Depth: 24 in.

Stream Current: moderate

Stream Substrate: gravel

Is there Streambank erosion beside the crossing? no

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? no

Is there sand over the crossing? yes

 

Extent of Erosion: severe

Cause of Erosion: sand over crossing, lack of diversion outlets at south (left) approach

Action Recommended? yes

Add pavement? no

Add paved raised edge? no

Number of diversion outlets: at least two

Increase fill? no

Replace culvert(s)? no

Extend culvert(s)? no

Comments: Location: Common Line between East Bay Township (T26N R10W Sec 13) and Union Township (T26N R9W Sec 18).

Lots of sand build up over crossing on shoulder, should be removed.

Raised edges are failing, some washouts.

Guardrails on both