MT. VERNON, Wash. -

Three people were rescued Thursday evening after a bridge collapsed across the Skagit River in western Washington sent cars and people into the water.

The bridge is located along Interstate 5 between Burlington and Mt. Vernon in Skagit County.

Washington State Patrol Trooper Mark Francis confirmed via Twitter that the north and southbound lanes of the bridge had collapsed around 7 p.m. and people and cars were in the water. Francis said he did not know what caused the collapse.

Marcus Deyerin, the public information officer for the incident, said that there appeared to be two vehicles and one travel trailer that went into the river when the bridge collapsed.

Deyerin said there are only three known patients. The first patient was loaded into a Skagit County Sheriff's rescue boat; two more patients that were in a truck in the water were extricated and moved to the shore.

All three patients were transferred to ambulances once they reached the shoreline and taken to an area hospital at 8:30 p.m. Emergency management officials are reporting there were no other patients and no loss of life in the collapse.

Washington Governor Jay Inslee is en-route to the scene with Washington State Patrol Chief John Batiste.

The National Transportation Safety Board, which investigates accidents involving aviation, rail lines and highways, confirmed it is gathering information on the bridge collapse. Officials say it's too early to tell what caused the collapse.

The Seattle Times reported the bridge that collapsed Thursday evening was classified as "functionally obsolete" in both 2000 and 2010 by the National Bridge Inventory.

According to the Washington State Department of Transportation, 11 bridges in Spokane County are listed as structurally deficient.  Bridges in Adams, Stevens and Whitman county are also on that list.

Statewide there are 156 state owned bridges listed as deficient.

According to the WSDOT website, a bridge is listed as deficient if it is in need of repair or replacement. A bridge on the list doesn't necessarily mean it's unsafe or a collapse is imminent ,the WSDOT added.

 Several of the bridges on the list are earmarked for repair this summer, including the I-90 bridge at mile marker 270 just west of Four Lakes.

In a national report card on America's infrastructure, the American Society of Civil Engineers gives Washington a C- when it comes to the condition of our state's bridges.

Click here to view the complete list of structurally deficient bridges in Washington.