Just off downtown Long Beach, where freighters queue up to unload much of the nation's imported goods, a long wall of rock rises from the waves, encrusted with mussels and crawling with crabs.
This is the Long Beach breakwater, a 2.2-mile vestige of World War II designed to shield the U.S. Navy's Pacific Fleet from stormy seas and enemy torpedoes.
Today, nearly two decades after the Navy and its ships pulled out of the area, critics contend that the stony barricade is the reason the city's now surf-less beaches are among the least popular and most polluted in the region.
Long Beach officials Thursday released the results of a study designed to attract congressional support for a controversial proposal to reconfigure the breakwater to create bigger waves, cleaner water and beaches, and more surf tourism.
The city could gain $52 million a year in local spending -- and $7 million annually in taxes and fees, the study found.
Details of the $100,000 study, conducted by the engineering firm Moffat & Nichol, will be presented to the Long Beach City Council on Monday.
Many civic leaders hope the findings will spur the U.S. Army Corps of Engineers, which owns and operates the breakwater, to analyze the feasibility of dismantling part of the barrier.
Officials said the project will be carried out only if it can overcome daunting challenges. Major concerns include how altering the breakwater would affect navigation into the ports of Los Angeles and Long Beach, and the offshore loading of weaponry onto Navy ships.
Then there are the area's oil islands, one of which was destroyed by heaving seas during a storm in 1983.
"Resolving those issues," said Russell Boudreau, principal coastal engineer for Moffat & Nichol, "will be far more challenging than moving breakwater rocks around."
Supporters of the proposal said the change would revive the city's historic seaside allure.
U.S. Rep. Laura Richardson (D-Long Beach) said it was her "hope and goal" to see the project completed within a decade.
"All the pieces are coming together," she said. "We are excited about the prospect of returning waves to Long Beach, but also committed to ensuring that any such project protects homes and the economic vitality of the largest port complex in the United States.
"If it is determined that we can do those two things and return the waves," she said, "then let the waters roll. We're ready."