A stretch of the San Joaquin River was moving much faster than usual.
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This was after PG&E released more water from the Kerckhoff Dam.
Starting early Sunday morning, PG&E gradually increased flows from 40 cubic feet per second to 1,500 feet per second, part of a study for the Kerckhoff Hydroelectric Project relicensing.
It didn't take long for Jacob Johnson and his girlfriend to notice the high flows while hiking in the San Joaquin River Gorge.
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They also saw the signs advising the public to stay out of the water in the high flow area - a nine-mile stretch between Kerckhoff Dam and Millerton Lake.
Leading up to the planned release, the Fresno County Sheriff's Office also put out a word of caution.
Water flows were reduced to 40 cubic feet per second by around 5 o' clock.