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A Race Against Mother Nature As Officials Send Water Cascading Out Of Lake Oroville

With more storms expected to slam Northern California later this week, officials worked frantically Monday to drain water from brimming Lake Oroville in hopes of heading off a potentially catastrophic flood. The operators at America’s tallest dam found themselves in a precarious position Monday, with both of the spillways used to release water compromised and the reservoir still filled almost to capacity after a winter of record rain and snow. Meanwhile, tens of thousands of evacuated residents downstream of the dam still have no clear word when they can return home.

Here’s The Nightmare Scenario At Oroville Dam That Officials Are Fighting To Prevent

Any dam engineer would be terrified of this nightmare scenario — the possible collapse of a retaining wall in California’s second largest reservoir.  That’s the prospect officials faced when they ordered more than 100,000 people evacuated downstream of the nation’s tallest dam Sunday. It occurred insidiously: a pocket of erosion that crept ever closer to a low concrete wall that was supposed to be the last, best defense against disaster.

State Said Emergency Spillway was ‘Safe and Solid’ After Challenge

Eleven years ago, as three environmental groups were urging the state and federal government to require that concrete be used to armor the emergency spillway at Oroville Dam — an earthen spillway whose near collapse caused the evacuation of 200,000 people this week — state water officials said that was unnecessary. “The spillway is a safe and solid structure founded on solid bedrock that will not erode,” the state Department of Water Resources concluded in a May 26, 2006, filing to federal officials.

 

Courting Disaster At Oroville Dam — Key Questions and Answers

Here are some central questions and answers about the damage to the Oroville Dam and the fight to prevent a catastrophe: What is the Oroville Dam? Work on the Oroville Dam — the tallest dam in the country at 770 feet — started in 1957 and included the relocation of California State Route 70 and Union Pacific Railroad tracks. It was completed in 1968, creating what is now the second-biggest reservoir in the state, sitting on the Feather River about 75 miles north of Sacramento in Butte County.

OPINION: State, Feds Must Answer For Oroville Dam Fiasco

Federal and state officials have a lot to answer for in the wake of the Oroville Dam fiasco. They decided in 2005 to ignore warnings that the massive earthen spillway adjacent to the dam itself could erode during heavy winter rains — which it has done — and cause a calamity, which it very nearly did this week and could yet do by the end of this winter. No less to blame are the water agencies, including the powerful Metropolitan Water District of Southern California, which argued that paying for the upgrades a decade ago was unnecessary.

Senators Disagree With Decision to Extend Drought Regulations

North state senators Ted Gaines and Jim Nielsen expressed their disagreement last week with the California State Water Resources Control Board’s decision to extend the state’s emergency drought regulations. Gaines, who represents the 1st Senate District that includes Siskiyou County, stated in a press release that by voting to extend the regulations, urban water districts will be subject to an additional 270 days of consumption reports, “stress tests,” and water-use cuts. “This decision is blind to the plain fact seen on every mountain, river and reservoir in the north state,” Gaines said.

BREAKING: No Word When Evacuation Order For 188,000 Will Be Lifted As Oroville Threat Remains

Yolo County has opened a shelter to assist those affected by the Oroville Dam spillway evacuation at the Yolo County Fairgrounds in the home arts building, 1250 East Gum Avenue, Woodland. Massive state response in place for dam emergency State officials have activated hundreds of people to help deal with the Oroville Dam crisis, sending 100 California Highway Patrol officers to the region and placing 1,200 California National Guard members on notice that they may be needed.

Too Much Water: How Oroville Dam Problems Became A Crisis

The mass evacuations underway below the Oroville Dam capped a week of frantic efforts to prevent flooding as America’s tallest dam reached capacity and its main spillway was severely damaged. Here is a brief explanation of the events so far. On Saturday, water levels reached so high that an emergency spillway was used for the first time. Officials initially believed the measure worked. But on Sunday afternoon, as more water from record storms flowed into Lake Oroville, officials detected a hole in the emergency spillway. That prompted the evacuation order.

 

Oroville Dam: Feds And State Officials Ignored Warnings 12 Years Ago

More than a decade ago, federal and state officials and some of California’s largest water agencies rejected concerns that the massive earthen spillway at Oroville Dam — at risk of collapse Sunday night and prompting the evacuation of 185,000 people — could erode during heavy winter rains and cause a catastrophe.

Oroville Dam: Feds and State Officials Ignored Warnings 12 Years Ago

More than a decade ago, federal and state officials and some of California’s largest water agencies rejected concerns that the massive earthen spillway at Oroville Dam — at risk of collapse Sunday night and prompting the evacuation of 185,000 people — could erode during heavy winter rains and cause a catastrophe.