Colorado Division of Wildlife: "Hatchery Trucks are Rolling!!"

From the Colorado DOV: 

HATCHERY TRUCKS ARE ROLLING

Among the earliest signs of spring in Colorado is a Division of Wildlife fish-stocking truck pulling up to a nearby lake or stream.

Catchable-sized trout from the state hatchery system provide season-opening opportunities for many anglers, especially near urban areas, and the DOW began stocking low-elevation waters along the Front Range, the eastern plains and the Western Slope around Grand Junction in March. Stocking of lowland lakes will continue through the spring and early summer, when their water temperatures become too warm for trout.