Countless other bridges are due for repair. Pennsylvania has the most structurally deficient bridges of any state - about 23 percent of its 25,000 spans are rated structurally deficient. About 10 percent of New Jersey bridges are so classified.
With $2 trillion in deferred-maintenance costs for the country's infrastructure, Obama said, there is a great need for projects similar to the I-495 bridge repairs. Infrastructure improvements also create jobs and attract businesses, he said.
"If Washington were working the way it's supposed to," he said, "Congress would be creating jobs right now."
Obama said he supported a short-term fix for the Highway Trust Fund that passed the House this week. But he said long-term solutions and planning were needed for transportation projects, especially as the United States lags behind countries such as Russia and China in infrastructure investments.
House Speaker John A. Boehner (R., Ohio) criticized Obama's trip to Delaware. His spokesman said the House had already passed a short-term highway bill and blamed Obama and the Democratic-controlled Senate for inaction.
"As a leader of that party, he could work to break the Senate gridlock," said spokesman Michael Steel. "Instead, he is giving a petulantly irrelevant speech."
Before his remarks at the Port of Wilmington, Obama surprised lunchtime customers at the Charcoal Pit restaurant on Route 202. He held babies, shook hands, bumped fists, and told jokes about Vice President Biden, who is from Delaware.
"Me and Joe share shakes all the time," Obama told two children sharing a milkshake.
Pat Grim of Newark, Del., said she was shocked to see the president walk in as she shared late lunch with a friend. The 67-year-old teaches ballroom dancing at the University of Delaware and said she told Obama that she had met Biden several times and "partied with him."
After greeting diners, Obama sat in a corner booth to eat lunch with Tanei Benjamin, a single working mother who wrote to the president last year about her struggles. Benjamin had tears in her eyes as she stood to hug Obama.
The president ordered a "pit special" - cheeseburger and fries - from the popular Delaware restaurant.