UPDATE - 10/04/13 -

MADISON, Wis. (AP) _ The federal government has agreed to cover most of the cost of repairs for the sagging Leo Frigo Bridge in Green Bay.

Gov. Scott Walker's administration announced Friday that the Federal Highway Administration has determined the repairs are eligible for funding. The federal money will cover 100 percent of emergency repairs with 180 days of the bridge's closure on Sept. 25 and 90 percent of emergency and permanent repairs thereafter. Preliminary estimates put the cost of repairs at $50 million but that figure could fluctuate as transportation officials develop a final repair plan.

Transportation officials closed the bridge after a deep dip developed in the pavement. Investigators have determined a support pier sank about 2 feet after pilings beneath the pier corroded and buckled.

Workers plan to build support towers adjacent to the pier to stabilize the structure within the next few days.

GREEN BAY, Wis. (AP) -- A support pier on a Wisconsin bridge sank after pilings underneath it buckled, probably because of corrosion.

That's the conclusion from a Wisconsin Department of Transportation investigation. The DOT has been working since last week to figure out what caused the support pier on the Leo Frigo Memorial Bridge to sink about 2 feet, creating a deep dip in the pavement.

The bridge that carries about 40,000 cars a day over the Fox River in Green Bay has been closed since Sept. 25.

The DOT said in a news release Thursday that investigators believe soil composition in the area and changes in the water table caused the corrosion. It says most other piers on the bridge are good condition. The agency will now begin working on a plan for repairs.

MADISON, Wis. (AP) _ Gov. Scott Walker has declared the closure of the Leo Frigo Bridge in Green Bay a disaster.

State transportation officials closed the bridge on Wednesday after a support pier unexpectedly sank 2 feet, causing a deep dip in the pavement. The bridge, which spans the Fox River at the mouth of Green Bay, carries about 40,000 cars a day.

Walker issued an executive order Friday calling the bridge a key commercial link, declaring the closure a disaster and placing Brown County in a state of emergency for 60 days.

The declarations could lead to federal reimbursement for the first 180 days of repair work.