AP Radio AP Radio News:

Apr 19, 9:37 PM EDT

The Latest: Senator vexed by bad communication at dam crisis

AP Photo
AP Photo/Rich Pedroncelli

OROVILLE, Calif. (AP) -- The Latest on the crisis at Oroville Dam (all times local):

6:20 p.m.

A California state senator is troubled that residents below a damaged California dam knew little about potential risk until ordered to evacuate when a spillway began breaking up.

Republican Sen. Jim Nielsen says communication from state managers during the February crisis at Oroville Dam was confusing to the public.

On Feb. 7, a massive crack opened in the main spillway at the dam. For days, managers assured the public there was no imminent danger as they slowed releases of water to assess the damage.

Then, a backup spillway started falling apart, triggering the evacuation order for nearly 200,000 people.

An Associated Press review found officials made a series of questionable decisions and missteps before and during the crisis.

Nielsen represents thousands of residents who were evacuated and says the confusing communication in the days leading to the evacuation will be one issue discussed during a Senate hearing on the crisis this month.

He says "there must be some accountability."

---

4:45 p.m.

Conservation groups are urging extensive and swift repairs at the nation's tallest dam, where an eroding spillway triggered an evacuation order for nearly 200,000 people in February.

The groups warn in a filing Wednesday with the Federal Energy Regulatory Commission that state should construct a concrete backup spillway to protect downstream communities below Northern California's Oroville Dam.

They also want more communication and transparency from the government on the work.

On Feb. 7, a massive crack opened in the main spillway at the dam. For days, managers assured the public there was no imminent danger as they slowed releases of water to assess the damage.

Then, a backup spillway started falling apart, triggering the evacuation.

The groups include the Friends of the River and Sierra Club California.

An Associated Press review found officials made a series of questionable decisions and missteps before and during the crisis.

---

3 p.m.

Managers at the nation's tallest dam made a critical mistake by allowing the lake behind it reach its highest level ever.

That's according to Bill Connolly, a Butte County supervisor in California whose district includes Oroville Dam.

The Associated Press reported Wednesday that dam managers obtained an uncommon exemption from the Army Corps of Engineers to bypass a rule that would have required them to release huge amounts of water from the rapidly filling dam.

The rising water in early February eventually topped a never-before-used spillway, which started breaking apart.

That triggered an evacuation order for nearly 200,000 people.

Connolly says that backup spillway was never intended to be used for flood control so "they never should have let the lake overflow."

He calls the dam poorly run.

---

12:55 p.m.

Democrats in the U.S. House want the auditing arm of Congress to review dam safety standards following a crisis at the nation's tallest dam.

The group that includes six House members from California tells the Government Accountability Office that a changing climate raises risks for aging dams around the U.S.

The say there is a "real crisis for dam safety."

In February, a massive crack opened in the main spillway at the Oroville Dam in Northern California. For days, managers assured the public there was no imminent danger as they slowed releases of water to assess the damage.

Then, a backup spillway started falling apart, triggering an evacuation order for nearly 200,000 people.

An Associated Press review has uncovered a series of questionable decisions and missteps before and during the crisis.

---

6 a.m.

An Associated Press review has uncovered a series of questionable decisions and missteps before and during a crisis at America's tallest dam.

In February, a massive crack opened in the main spillway at the Oroville Dam in Northern California.

For days, managers assured the public there was no imminent danger as they slowed releases of water to assess the damage.

Then, a backup spillway started falling apart, triggering an evacuation order for nearly 200,000 people.

The AP has found the dam received an uncommon exemption from federal rules requiring it to release huge amounts of water.

And government overseers overestimated the durability of the two spillways.

State water officials say the crisis was managed as effectively as possible.

© 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.