Washington State bridge collapse highlights aging U.S. infrastructure

Six years after a Minneapolis bridge collapse that killed 13 people called attention to the state of the nation's bridges, there has been minimal improvement and insufficient funding to repair and replace aging spans.

The collapse Thursday of the Interstate Highway 5 in Washington state shined the spotlight once again on troubled bridges.

In 2012, the Federal Highway Administration said 67,000 — 11% — of the nation's 607,000 bridges were structurally deficient. That means the bridges are not unsafe but must be closely monitored and inspected or repaired.