Alice Springs police say that waters in the Todd River are now subsiding, but all causeways will remain closed overnight.
The river reportedly peaked earlier this evening after a storm that felled some trees and powerlines.
Police have asked all residents to remain indoors and postpone any unnecessary travel.
"If there's not a real necessity to be out and about, people should just stay at home and wait for the river levels to come down," Superintendent Sean Parnell said.
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