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Carter Taylor, 10, and his friend Luke Duhan, 8, walk their inner tube along the banks of Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.

Carter Taylor, 10, and his friend Luke Duhan, 8, ride small rapids in their inner tube in Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.

Bryan Cockerham, right, and his daughter Autumn, 9, of Frederick, ride small rapids in their inner tubes in Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.

A swimmer jumps into a hole in the waters of Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.

Carlo Gonzales, right, owner of a pop-up food stand, creates a mango on a stick with lemon spritz, Mexican spice Tarjin and chamoy for customers in Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado. Waiting for the fruit treat are from left to right Rex Hauck, his daughter Laurel, Nicole Seraso and her brother Michael. Gonzales sold the sweet and spicy treat for $5 a mango.

Coco Litre, 18, jumps off of a rock into the waters near his inner tube in Boulder Creek near Eben G. Fine Park on September 3, 2023 in Boulder, Colorado. (Photo by Helen H. Richardson/The Denver Post)

BOULDER, CO - SEPTEMBER 3: Kinley Taylor, 7, rides small rapids in her inner tube in Boulder Creek near Eben G. Fine Park on September 3, 2023 in Boulder, Colorado. (Photo by Helen H. Richardson/The Denver Post)

Autumn Cockerham, 9, of Frederick, rides small rapids in her inner tube in Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.

Evan Sauget gets ready to go over small rapids in his inner tube in Boulder Creek near Eben G. Fine Park on Sept. 3, 2023 in Boulder, Colorado.