The Lakes Where Trout Grow Largest

For trout to thrive, they require cold, shallow water with structural cover, such as overhanging vegetation or substrate, when they are juveniles, to protect against predators. When they grow into adults, trout need deeper water but still need structural cover. When these conditions are met, trout can grow quite large, but in which lakes in the United States can the largest trout be found? Fishing hobbyists and environmental buffs alike will be interested to learn about these five lakes in the United States that produce the largest trout.

Pyramid Lake

Pyramid Lake, located in Nevada, is the remnant of the ancient Lake Lahontan, which covered the majority of the state. Pyramid Lake covers 188 square miles, with the deepest parts of the lake being about 350 feet deep, a great environment for Cutthroat Trout. Cutthroat Trout here typically weigh over 10 Ibs but they can grow much larger. The world record Lahontan Cutthroat Trout was caught in Pyramid Lake, weighing in at 41 Ibs. Before fishing, it is important to read up about the regulations at the lake, such as fishing without bait, using only barbless hooks, procuring a tribal fishing and/or boating permit, and more that can be found on the Pyramid Lake website. The lake resides on land belonging to the Pyramid Lake Paiute Tribe, and it is imperative to be respectful of the regulations put in place.

Iliamna Lake

Iliamna Lake is the largest lake in Alaska, covering about 1,000 square miles. It is thought that the trout in this lake grow so large due to the cold waters. The temperatures in Alaska make the trout grow slower but live longer, with some rainbow trout believed to live over 10 years and many weighing in at over ten pounds. Another factor in the trout growing larger in Alaska is the environment, which provides abundant food sources for the fish. Specifically, eggs laid by migrating salmon provide a rich source of nutrition for the trout in these waters. In 1995, a lake trout was caught in Lake Iliamna weighing 72 Ibs.

Blue Mesa Reservoir

Blue Mesa Reservoir is located in Gunnison, Colorado, and is the state's largest body of water, measuring 20 miles long and over 9,000 acres of surface area. It is known as a prime place to catch trophy lake trout. State records of lake trout have been caught with many over 30 Ibs. In 2007, a 50-pound and 5-ounce lake trout was caught, and in 2023, another lake trout was caught, weighing in at 73.29 lbs. More than just lake trout can be found in these waters, with brown trout and rainbow trout also calling Blue Mesa Reservoir home. Rainbow and brown trout in Blue Mesa Reservoir can average in size around 14-16 inches, with many measuring over 22 inches.

Lake Superior

By surface area, Lake Superior is the second-largest lake in the world and the third-largest by volume. There are places in Lake Superior that reach depths of 1,333 ft, making for a great environment for trout to grow. In 2024, a brown trout was caught and released in the Minnesota part of the lake that was 30 inches long. Meanwhile, in Wisconsin's portion of the lake, back in 1946, a 47-pound lake trout was recorded to be caught as well. The trout in these northern waters aren't just heavy; they're also long. In 2025, a lake trout was caught that was 43.25 inches long. Just recently, in 2026, that record was broken when a Lake Trout was caught and released, coming in at 44 inches long.

Flaming Gorge Reservoir

Flaming Gorge Reservoir is located between Wyoming and Utah and is about 91 miles long. This reservoir holds eleven state fishing records and two former world records, several of these records being from large trout. In 1995, a lake trout was caught weighing 50 pounds. Then, in 2019, another lake trout was caught and released that was 48" in length. More recently, a lake trout was caught in 2020, weighing in at 53 pounds and 15 ounces. Brown trout have also broken records, one in 1977 weighing 33 pounds and 10 ounces and measuring 40 inches long, and another brown trout in 1982 weighing 25.81 pounds. Lastly, a record rainbow trout was caught in 1979, weighing 26 pounds and 2 ounces.

Massive Trout in Deep Waters

Each of these lakes boasts a plethora of trophy-sized trout, but we have the people in charge of protecting these beautiful lakes and conscientious anglers who take care not to over-fish to thank for that. Without people ensuring the safe catch and release of these trout and the protection of their ecosystems, future generations would not be able to enjoy the beautiful fish that grow larger and larger each year. One of these lakes is bound to produce another record-breaking trout soon.