The Glory Hole acts as flood mitigation for the the manmade lake, serving as a massive funnel once water levels reach about 440 feet. Last year, water levels at the spillway edged on the brink of activation for weeks, but never managed to spill over.

Parts of northern California could see up to a foot of rain, but Phoenix will remain dry and warmer than usual.

First, there was President Trump’s executive order to release billions of gallons of water from two reservoirs in the Central Valley, then came this week’s atmospheric rivers. With more rain in the forecast,

At atmospheric river continues to slam portions of California Tuesday, with multiple inches of rain expected until Wednesday. morning.

The second peak of an ongoing atmospheric river storm arrived in Northern California Monday afternoon, prompting flood watches and a winter storm warning up in the Sierra.

This atmospheric river has brought heavy rain, flooding and strong wind gusts to Northern California. Wind gusts of 87 mph were reported north of San Francisco as well.

In what has become a much-anticipated sight, the morning glory spillway at Lake Berryessa is now active after this week's storms.

There’s really nothing like it. It’s a very odd-looking spillway that just disappears into the void. You almost have to see it.”