OROVILLE, Calif. --Authorities have lifted an evacuation order for nearly 200,000 California residents who live below a dam with a damaged spillway that threatened to collapse and cause catastrophic flooding.

Butte County Sheriff Kory Honea said Tuesday that residents should stay prepared in case the situation changes. He says the water level at the lake behind Oroville Dam, the nations tallest, is low enough to accommodate expected storm.

Crews have working around the clock atop the crippled Oroville Dam, making progress on repairs ro the damaged spillway. The work led to the lake level reducing by at least 8 feet overnight at a Northern California reservoir that has been central to the life of the towns around it for a half century.

Workers hoisted giant white bags filled with rocks, and at least two helicopters planned to fly in rocks Tuesday then release them into the eroded area of the spillway. Dump trucks full of boulders also were dumping cargo on the damaged spillway.

Backhoes load boulders into dump trucks as emergency personnel work to fix the damage below the emergency spillway at Oroville Lake

Getty

The first test of these fixes will come as early as Wednesday, when a series of storms this area, CBS News John Blackstone reports.

The lake that for five decades has brought residents holiday fireworks and salmon festivals could have brought disaster.

Never in our lives did we think anything like this would have happened, said Brannan Ramirez, who has lived in Oroville, a town of about 16,000 people, for about five years.

Recent reports indicate that environmental activists and local government officials warned more than a decade ago about the risk of catastrophic flooding below a major Northern California dam, the very scenario that threatened to unfold in Oroville over the weekend.

State and federal regulators dismissed those fears at the time, saying they were confident the hillside that helps hold back hundreds of billions of gallons of water was stable and did not need to be reinforced with concrete.

In this Saturday, Feb. 11, 2017, aerial photo released by California Department of Water Resources shows the damaged spillway with eroded hillside in Oroville, Calif.

William Croyle/California Department of Water Resources via AP

That decision has come under scrutiny now that the hillside, which acts as an emergency spillway for the reservoir, was put to its first test in the dams nearly 50-year history.

The acting head of the states Department of Water Resources said he was unaware of the 2005 report that recommended reinforcing with concrete an earthen spillway that is now eroding.

Im not sure anything went wrong, Bill Croyle said. This was a new, never-having-happened-before event.

Evacuee Crystal Roberts-Lynch didnt buy the explanations.

I know that somebody did not pay attention to the warning signs, she said. Someone in charge was not paying attention. It was their job to pay attention to what was going on with the dam.

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Nearly 200,000 people evacuated from their homes in Northern California are still unable to go home. If an emergency spillway at the Oroville Dam...

Oroville is a Gold Rush town in the Sierra Nevada foothills, some 70 miles northeast of Sacramento, nestled near the foot of the dam. The dam was completed in 1968 and is the nations tallest, at 770 feet. Houses and churches are perched on tree-lined streets near the Feather River. Old, ornate Victorian homes sit alongside smaller bungalows.

Everybody knows to go there for the Fourth of July, Roberts-Lynch said of the lake. Then theres festivals wrapped around the salmon run. The mother of three, who has lived in Oroville for 10 years, was staying at a Red Cross evacuation center in Chico.

Local businesses, including one that sells supplies for gold-panning, dominate a downtown area that spans several blocks. A wide range of chain stores sit a short distance away along the main highway.

The lake brings in an enormous part of the economy for the town. It definitely is a people-catcher, said Brannan Ramirez, who has lived in Oroville for about five years. We get people from all over the country.

Cities and towns farther down the Feather River also are in danger.

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More heavy rain and widespread flooding is expected in the western U.S. Chief meteorologist Eric Fisher from our Boston affiliate station WBZ is ...

Yuba City, population 65,000, is the biggest city evacuated. The city has the largest dried-fruit processing plant in the world and one of the largest populations of Sikhs outside of India.

The region is largely rural and its politics dominated by rice growers and other agricultural interests, including orchard operators. The region is dogged by the high unemployment rates endemic to farming communities. There are large pockets of poverty and swaths of sparsely populated forests, popular with anglers, campers and backpackers.

For now, its all at the mercy of the reservoir that usually sustains it, and provides water for much of the state.

If anything, we would have thought that the dam would have been constructed better, Ramirez said.

Over the weekend, the swollen lake spilled down the unpaved, emergency spillway, which had never been used before, for nearly 40 hours, leaving it badly eroded.

Officials defended the decision to suddenly call for mass evacuations late Sunday afternoon, just a few hours after saying the situation was stable, forcing families to rush to pack up and get out.

There was a lot of traffic. It was chaos, said Robert Brabant, an Oroville resident who evacuated with his wife, son, dogs and cats. It was a lot of accidents. It was like people werent paying attention to other people.

California Gov. Jerry Brown

AP/Nick Ut, File

Gov. Jerry Brown said Monday that he sent a letter to the White House requesting direct federal assistance in the emergency, though some federal agencies have been helping already.

Brown has had harsh words for President Donald Trump, and the state has vowed to resist many of his administrations efforts.

But the governor said at a news conference that hes sure that California and Washington will work in a constructive way. Thats my attitude. There will be different points of view, but were all one America.

The governor said he doesnt plan to go to Oroville and distract from efforts, but he tried to reassure evacuees.

My message is that were doing everything we can to get this dam in shape and they can return and they can live safely without fear, Brown said.

But evacuee Kelly Remocal said she believed the public officials working on the problem are downplaying everything so people dont freak out.

I honestly dont think theyre going to be able to do it, fix the problem, she said. This requires a little more than a Band-Aid. At this point they have no choice but to give it a Band-Aid fix.

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