During World War II, Oregon built an entire city for wartime laborers. Around 40,000 were living there before a flood erased it from the map within hours

In 1942, during World War II, a city called Vanport was built near Portland to house workers arriving for jobs in the region's booming shipyards. What began as a massive wartime housing project soon grew into Oregon's second-largest city, with around 40,000 people calling it home.

But Vanport's story lasted only about six years.

In 1948, a catastrophic flood swept through the city, destroying it within hours and forcing thousands of residents to flee.


A city built in a hurry

Portland's shipbuilding industry exploded during World War II, attracting workers from across the United States. With housing in short supply, Vanport was constructed at remarkable speed on low-lying land between Portland and Vancouver, Washington.

Apartment buildings, schools, shops, streets, utilities and transportation services quickly transformed the site into a functioning city. Families settled there, children went to school, neighbors formed communities and businesses opened their doors.

Although Vanport was originally intended to serve the temporary demands of the war, many residents stayed after the fighting ended. Housing remained scarce around Portland, and the city had become a community of its own.

Vanport was also one of Oregon's most diverse communities at the time. Thousands of African American workers and their families had moved west for wartime jobs, joining residents who had arrived from other parts of the country.

Despite the racial discrimination that was widespread in America at the time, people from different backgrounds lived alongside one another, shared schools and community spaces, and built lives in the rapidly growing city.

The flood that changed everything

Vanport's biggest weakness was its location.

The city had been built on low-lying ground protected from the Columbia River by a system of dikes. Its survival depended on those barriers holding back the river.

Then came the spring of 1948.

A deep mountain snowpack across the Columbia River Basin was followed by warmer temperatures and heavy seasonal rainfall. The combination caused snow to melt rapidly, sending huge volumes of water into rivers across the region.

The water levels kept rising, putting enormous pressure on flood defenses.

On May 30, 1948, one of Vanport's dikes failed.

Water poured into the city with terrifying speed. Residents who had expected the flood defenses to hold suddenly had to escape, often grabbing only the belongings they could carry. Rescue crews worked to reach people trapped by the rising water.

Within hours, Vanport was devastated.

A city that was never rebuilt

The flood left thousands of people homeless. Survivors scattered throughout Portland and surrounding communities, where finding new housing was difficult because the region was already facing a shortage.

For many African American families, the disaster was especially disruptive. After moving to Oregon for wartime opportunities and establishing lives in Vanport, they were forced to relocate once again.

Vanport was never rebuilt.

Today, much of the former city site has been transformed into areas including Delta Park and Portland International Raceway. Few visible traces remain of the community that once had around 40,000 residents.

For a city that existed for only six years, Vanport left an extraordinary mark on Oregon's history — a wartime boomtown that rose almost overnight and disappeared in a matter of hours.