dam nation

The Latest: Officials: Dam water level continues to drop
By ABC News

Hope they’re right.


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 nation’s tallest, is low enough to accommodate an expected storm.

Bill Croyle, the acting director of California’s Department of Water Resources, has listed several reasons he’s confident it is safe for people to return to their homes near a damaged dam spillway.

He says experts have examined the chasm at the foot of the emergency spillway and determined that the concrete slab that holds back water in the reservoir is structurally sound. Likewise, the main spillway has been “stable” for four days.

The forecasts call for a much colder storm than the area experienced last weekend, so much of the precipitation will fall as snow instead of rain. As a result, Croyle expects more water to be released from the reservoir than let in, even during the stormy period.

Croyle also says there’s now enough capacity in the lake for it to absorb an influx of water if necessary. And after days of work to reinforce the drainage area beneath the emergency spillway, Croyle said he wouldn’t be concerned about using it if necessary.

Lepatner: There's 18,000 high-risk dams in this nation

Barry Lepatner, attorney in construction law firm, infrastructure expert and author of “Too Big to Fall: America’s Failing Infrastructure and the Way Forward” weighs in on America’s decaying infrastructure.
20% of dams in populated areas lack emergency plan

However, with an increasing population and greater development below dams, the overall number of high-hazard dams continues to increase.“
"The nations dams are aging, and the number of high-hazard dams is on the rise,” according to a 2013 report from the American Society of Civil Engineers.
More than three quarters of the high-hazard dams are state regulated, according to Association of State Dam Safety Officials.
In 2015, states spent $49.4 million regulating and inspecting more than 81,000 dams, including the high-hazard dams under state regulation.
Among those high-hazard dams, nearly 1 in 5 lack an emergency action plan, a document dam owners maintain that includes critical information such as emergency contacts, details about the dam and an inundation map.

I am a bot written by a Mathematician

Posted at Tue Feb 14 11:10:36 2017


Where is Lake Oroville and the Oroville Dam?

Lake Oroville is about 75 miles north of Sacramento and about 25 miles southeast of Chico. The dam is the tallest in the United States. Its emergency spillway is damaged, and the lake is at capacity.

California crews rush to fix dam before new storms hit, Reuters - Feb 13, 2017 9:29pm EST 

Extremely Close Footage -Lake Oroville Emergency Spillway Runoff


The frantic fight to save the nations tallest dam Lake Oroville dam spillway damage in HD

Oroville Dam running on temporary licenses; mandatory evacuations still in place

A spokeswoman for the Federal Energy Regulatory Commission says a 50-year license for Oroville Dam, the nation’s tallest, expired in January 2007. Mary O'Driscoll says the facility has been operating under an existing license that’s renewed each year.
California dam water level drops after massive evacuation

External image


California dam water level drops after massive evacuation

Water levels dropped Monday at California’s Lake Oroville, stopping water from spilling over a massive dam’s potentially hazardous emergency spillway after authorities ordered the evacuation of nearly 200,000 people from towns lying below the lake. California Department of Water Resources officials were preparing to inspect an erosion scar on the spillway at the Oroville Dam, the nation’s largest. Authorities ordered the evacuations Sunday for people living below the lake after authorities warned that failure of the emergency spillway could send a 30-foot wall of water into the communities.

We need to continue to lower the lake levels 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.

Butte County Sheriff Kory

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. The California National Guard notified all its 23,000 soldiers and airmen to be ready to deploy, the first time an alert for the entire California National Guard had been issued since the 1992 riots in Los Angeles after a jury acquitted four police officers in the beating of Rodney King.

Threat eases at nation’s tallest dam, in NorCal, but evacs still in place
CBS News
About 150 miles northeast of San Francisco, Lake Oroville is one of California’s largest man-made lakes, and the 770-foot-tall Oroville Dam is the nation’s tallest. Over five hours after the evacuations were called for, hundreds of cars carrying …

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Evacuations ordered over concerns at California dam system
Residents near California's Oroville Dam are being ordered to evacuate amid what could be an impending disaster, authorities say.
By Madison Park and Eliott C. McLaughlin, CNN

At least 188,000 people have evacuated from several Northern California counties after damage to a spillway at the Oroville Dam.

The dam, which is the nation’s tallest, remains intact. But the emergency spillway, which guards against the overflow of the dam when water levels are high, was eroding Sunday.


VIDEO: (((EMERGENCY ALERT))) FOR #NorthernCalifornia #OrovilleDam maybe BLOW AT ANY MINUTE! (((EVACUATE))) …


[SEE NEXT POST] #Preppers #UrbanPreppers #CityPreppers and #LiberalPreppers…

“188,000 people were asked to evacuate in Northern CA. after authorities warned an emergency spillway in the country’s tallest dam was in danger of failing Sunday and unleashing uncontrolled flood waters on towns below…

About 150 miles northeast of #SanFrancisco, #LakeOroville is one of California’s largest man-made lakes, and the 770-foot-tall Oroville #Dam is the nation’s tallest.The evacuation was ordered Sunday afternoon over concerns the dam’s emergency spillway could fail. Over five hours later, hundreds of cars carrying panicked and angry people were sitting in bumper-to-bumper traffic…

"The police came and told us to evacuate,” said Kaysi Levias who was with her husband, Greg, at a gas station as they attempted to flee…

Officials warned residents that the spillway could fail within an hour…

“I’m just shocked,” Greg Levias said. “Pretty mad.”…

“Not giving us more warning,” said Kaysi, finishing his sentence.“We’ve never been through this before,” said Kaysi Levias. “We have two boys and our dog. 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…

The cities of #Oroville, #Gridley, #LiveOak, #Marysville, #Wheatland, #YubaCity, #PlumasLake, and Olivehurst were all under evacuation orders…

The evacuation order went out around 4 p.m. after engineers spotted a hole that was eroding back toward the top of the spillway…

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, the #California Department of Water Resources said. Those potential flows could overwhelm the Feather River and other downstream waterways, channels and levees.“ …


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