Trinity River - Upper - Lewiston, CA

The Upper Trinity River, flowing below Lewiston Dam, is one of California’s most respected fly fisheries, offering exceptional opportunities for both resident rainbow trout and seasonal steelhead. Located near the town of Lewiston, this tailwater fishery is defined by cold, clear water, stable year-round flows, and strict regulations that prioritize long-term fishery health.

Designated as a special regulation zone, much of the river requires catch-and-release practices, artificial lures only, and barbless hooks. These rules have fostered a high-quality fishery known for trophy rainbow trout and strong steelhead returns.

Prime steelhead fishing occurs from late September through February, with both wild and hatchery fish present. Anglers target them using swung flies, egg patterns, and nymphs. Trout fishing is productive year-round, with spring and early summer offering consistent nymphing and dry fly action during prolific caddis and mayfly hatches.

Access is excellent, with popular entry points near the Lewiston National Fish Hatchery and designated public lands. The river’s structure—riffles, runs, and deep pools—offers diverse fishing opportunities, primarily for wade anglers.

This section of the Trinity River is a destination fishery for serious fly anglers seeking technical, rewarding fishing in a beautiful setting. With consistent cold water, selective fish, and rigorous protections, the Upper Trinity remains a benchmark for California trout and steelhead management.