OROVILLE, Calif. (AP) — Nearly 200,000 people remained under evacuation orders Monday as California authorities try to fix erosion of the emergency spillway at the nation’s tallest dam that could unleash uncontrolled flood waters if it fails.
From Washington Times
About 150 miles northeast of San Francisco, Lake Oroville — one of California’s largest man-made lakes — had water levels so high that an emergency spillway was used Saturday for the first time in almost 50 years after its main spillway was damaged during recent heavy rain.
The evacuation was ordered Sunday afternoon after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour.
“I’m just shocked,” said Greg Levias, who was evacuating with his wife, Kaysi.
“We have two boys and our dog,” said Kaysi Levias. “All the stuff we could fit in the trunk – clothes and blankets.”
What they couldn’t fit they piled as high as they could in their downstairs Yuba City apartment and joined the line of traffic attempting to leave the city where they had moved just three weeks ago.
Panicked and angry residents sat in bumper-to-bumper traffic hours after the evacuation order was given.
Raj Gill was managing a Shell station where panicky motorists got gas and snacks while they waited for gridlocked traffic to clear. His boss told him to close the station and flee himself, but he stayed open to feed a steady line of customers.
“You can’t even move,” he said. “I’m trying to get out of here too,” he said. “I’m worried about the flooding. I’ve seen the pictures – that’s a lot of water.”
State Fire and Rescue Chief Kim Zagaris said at least 250 law enforcement officers from throughout the state are in the area or on their way to help the people evacuating.
A California Highway patrol spokesman said they would have two planes out Monday to help with search and rescue and traffic control.
Late Sunday, officials noted water was no longer spilling over the eroded area but said the evacuation orders remained in place.
“There is still a lot of unknowns,” said Butte County Sheriff Kory Honea. “We need to continue to lower the lake levers and we need to give the Department of Water Resources time to fully evaluate the situation so we can make the decision to whether or not it is safe to repopulate the area.”
About 188,000 residents of owns in Yuba, Sutter and Butte counties remained under evacuation orders.
Acting Director Department of Water Resources Bill Croyle said officials will be able to assess the damage to the emergency spillway now that the lake levels have been lowered.
The erosion at the head of the emergency spillway threatens to undermine the concrete weir and allow large, uncontrolled releases of water from Lake Oroville. Those potential flows could overwhelm the Feather River and other downstream waterways, channels and levees and flood towns in three counties.
Oroville Lake levels had decreased by Sunday night as they let water flow from its heavily damaged main spillway.
Croyle said the department will continue releasing as much as 100,000 cubic feet per second from the main spillway to try and reduce the dam’s level by 50 feet ahead of upcoming storms forecast to reach the area Wednesday.
Department engineer and spokesman Kevin Dossey told the Sacramento Bee the emergency spillway was rated to handle 250,000 cubic feet per second, but it began to show weakness Sunday after flows peaked at 12,600 cubic feet per second.
Honea said there was a plan to plug the hole by using helicopters to drop rocks into the crevasse. But Croyle said at that no repair work was done after officials looked at the flow and available resources.
Gov. Jerry Brown late Sunday issued an emergency order to fortify authorities’ response to the emergency at the dam and help with evacuations.
Adjunct General David S. Baldwin said at a news conference late Sunday that the helicopters will also be available for search and rescue Monday.
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