OROVILLE (AP) ― Crews worked to clean up dirt and debris from the base of Oroville Dam, and biologists rushed to save stranded fish after state officials shut off the flow of water from a damaged spillway at the Northern California lake on Feb. 28.
Officials brought in extra heavy equipment to remove sediment, concrete and debris that washed down the eroded hillside and collected at the bottom. The erosion forced authorities to order nearly 200,000 people to evacuate three weeks ago when experts feared it would undermine a concrete wall holding water in the lake and unleash a 30-foot wall of water.
Department of Water Resources officials estimated the debris pile measured 1 million cubic yards ̶ enough to fill more than 300 Olympic-sized swimming pools.
Water officials announced Feb. 27 they were closing the floodgates at the top of the spillway, stopping the release of water from Lake Oroville for the first time in three weeks and showing that much of the concrete spillway is now gone. It’s been replaced by a deep gash in the earth on both sides.
The decision to shut off water releases gives crews time to remove the debris, which is preventing the use of a hydroelectric power plant at the base of the dam. However it has severely curtailed the flow of water downstream on the Feather River, leaving fish stranded in pools of water separated from the main river channel.
The water level has risen more than three feet since crews stopped flows out of Lake Oroville. The lake still has room for 60 feet of water, with no imminent rain in the forecast.
State lawmakers postponed a Senate hearing so water officials could focus on their work at the lake. A new date hasn’t been selected.