The Big Thompson River is a river in the state of Colorado in the United States. It is located in the Front Range of the Rocky Mountains, and flows through the mountains and canyons of the northern part of the state. The river is named after its discoverer, John Thompson, who explored the area in the 1830s.

The Big Thompson River is a popular destination for all types of fishing and is known for its population of rainbow, brown, and brook trout. The river is also home to other fish species, such as smallmouth bass, kokanee salmon, and greenback cutthroat trout. The best time to fish on the Big Thompson River is typically in the spring and early summer when the water is colder, and the fish are more active.

Some pockets of deepwater and swift current.