AVON -- Bikers and walkers near Avon will not be able to use a portion of the Lake Wobegon Trail after a fire last (Saturday) night.

The incident happened at about 6:00 p.m. at the Lake Wobegon Trail bridge at Schwinghammer Lake, east of Albany.

The Stearns County Sheriff's Office says a bicyclist, 56-year-old Robert Youngdahl of St. Cloud, was using the trail and spotted the fire.

When fire crews arrived they found the bridge fully engulfed.

Authorities says the cause of the fire is unknown and the bridge is closed until further notice.

The case remains under investigation and anyone with information is asked to contact the Stearns County Sheriff's Office.