CASPER, Wyo. (AP) — State wildlife officials are warning residents to be cautious as water levels rise and fall on the North Platte River during a 10-day project intended to maintain fish spawning habitats.

The flushing flow project is also meant to put more invertebrates in the food chain for the fish to eat.

A news release from the Wyoming Game and Fish Department cautioned those who may wade or float in the river that daily flows will fluctuate from 4,000 cubic feet per second to 500 cubic feet per second.

Trout numbers were less than 400 per mile before the flush and flow projects were implemented. The population is now at an average of more than 3,500 per mile.

The 10-day flush will run through March 16.