Oroville Dam update of Spillway.
On February 7, 2017, during ongoing flood control release of about 50,000 cubic feet per second (1,400 m3/s) a crater appeared in the Oroville dam spillway.[1] Due to continual high inflows to Lake Oroville, dam operators had no other alternatives but to continue using the damaged spillway. Attempts went underway to try and prepare the never before used Emergency Spillway as water levels continued to rise while the damaged spillway was in continual use. Power transmission lines were moved, and workers began clear cutting trees within the emergency spillway, which flowed down a hillside. [2] Damage from the spillway crater earlier throughout the event was carried down stream, and caused damages to a nearby fish hatchery, state workers began evacuating fish and eggs from the hatchery in an attempt to lessen damages.[3] By February 10, the hole had grown to 300 feet (91 m) wide, 500 feet (150 m) long and 45 feet (14 m) deep.[4] Although Engineers had hoped that using the damaged spillway may drain the lake enough to allow for the emergency spillway to not be used, the inflow of water ended up being to much.[5] On February 11, 2017 Lake Oroville hit the overflow mark of the emergency spillway, which until then, had never been used since the dam's construction in 1968.[6] Because the spillway is a separate structure from the dam, there wasn't any real danger of the main embankment being breached. The dams structure itself continued holding and not damages were found, the possible evacuation of Oroville itself was also negated as the residents were still safe. However, once the lake rose to the level of the emergency spillway, it created an uncontrolled overflow, although attempts to prepare the emergency spillway to lessen damages were made, due to the emergency spillway emptying directly onto a hillside, substantial debris is expected to be eroded and carried into the river.[7]
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- ^ Kasler, Dale; Sabalow, Ryan; Reese, Phillip. "Crater in Oroville Dam spillway will continue to grow, officials warn, as reservoir levels climb". Sacremento Bee. Retrieved 9 February 2017.
- ^ "In Historic First, Lake Oroville Flows Over Dam's Emergency Spillway". KQED News. 2017-02-11. Retrieved 2017-02-11.
- ^ "The Latest: California lake damage may near $100 million". NewsOK.com. 2017-02-10. Retrieved 2017-02-11.
- ^ Graff, Amy (2017-02-10). "Gaping hole in Oroville Dam spillway is growing, officials warn". SFGate. Retrieved 2017-02-10.
- ^ "Sacrificing California spillway may avoid emergency releases". Retrieved 2017-02-11.
- ^ Associated Press (2017-02-10). "The Latest: Emergency Spillway Use Likely at Oroville Dam". ABC News. Retrieved 2017-02-10.
- ^ Associated Press (2017-02-10). "Oroville Dam's emergency spillway may be used to handle California runoff". CBS News. Retrieved 2017-02-10.