The Oroville Dam has seen its concrete spillway partially collapse, necessitating the use of the emergency spillway, which has never been used before. The lake behind the dam is expected to peak at 7 feet of overflow over the wide emergency spillway, by sometime tonight. The concrete spillway is seeing erosion of the area around one side of it.
The Oroville Dam is 700 feet tall, and created Lake Oroville, which is second only to Lake Shasta in size in California. Heavy rains have caused the lake to rise over 20 feet, and more heavy rains are expected on Thursday, into Friday. The water from the dam eventually empties into the Sacramento River.
From Adapt 2030:
The California Government assured the citizens that the emergency spillway would not be used in the lake overflow as Oroville Dam’s concrete spillway collapsed due to structural failure at 65,000 CFS release. Now with the lower hydroelectric facility discharge out flow clogged with debris there will be +12,000 CFS flow over top and also authorities will scale back flow from collapsed spillway to 35,000 CFS from 55,000 CFS which means and extra 32,000 CFS will pour over the untested emergency spillway.
THOSE IN THE DRAINAGE BASIN OF THIS DAM NEED TO PREPARE TO POSSIBLY EVACUATE. IF THE ORDER IS GIVEN YOU WILL HAVE LESS THAN 30 MINUTES TO LEAVE. PREPARE NOW.
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