Missouri River, Montana
Below Holter Dam — Montana's most prolific tailwater with legendary Trico spinner falls
The Missouri River below Holter Dam near Craig, Montana is Montana's premier tailwater trout fishery — a wide, powerful river of extraordinary productivity that flows through open canyon country north of Helena. With an estimated 5,000–8,000 trout per mile in prime sections, the Missouri between Holter Dam and Cascade is one of the most densely populated trout rivers in the world, and the town of Craig — population roughly 50 — exists almost entirely to serve the fly fishers who travel here.
The Missouri is a big-water tailwater that demands a drift boat for best results. Cold releases from Holter Reservoir maintain ideal temperatures year-round, while the river's broad, braided channels and complex weed beds create habitat for both trout and the extraordinary insect populations that feed them. The annual biomass of aquatic insects in the Craig section is genuinely staggering — something that becomes immediately apparent on summer mornings when Trico spinners fill the air above the river.
The Trico spinner fall is the Missouri's signature event and one of the most impressive in American fly fishing. From late July through September, dense spinner falls occur every morning as overnight Trico adults fall spent to the surface, triggering simultaneous surface feeding from virtually every trout in the river. The Missouri's Trico fishing is not technical by spring creek standards — fish are feeding aggressively — but the sheer number of naturals means exact fly placement in the feeding lane is critical.
Winter and early spring midge fishing is exceptional on the Missouri, particularly during the mid-morning emergence windows on calm days. The consistency of the tailwater flows means the Missouri fishes 12 months a year, and dedicated anglers visit in January for solitary midge fishing that rivals any summer day.
Craig — Primary Launch
The town of Craig is the hub for Missouri River fishing. Multiple guide outfitters launch from here. Walk-wade access from the public fishing access sites on both banks.
Holter Dam — Upper Access
Access near the dam for the most productive upper tailwater section. Slightly more technical fishing but exceptional fish density close to the reservoir.
Cascade — Lower Access
Take-out for extended float trips. Drive-access wading here before the river enters private land sections below Cascade.
Rainbow Trout
Dominant species with extraordinary density. Wild fish averaging 14–18 inches throughout. Exceptional fighters in the Missouri's powerful current. Trico and midge fishing both produce excellent surface action.
Brown Trout
Less numerous than rainbows but present throughout. Larger average size. Most active during fall BWO hatches and streamer fishing in September–October.
Trico spinner falls begin at dawn — be on the water before 7am during July through September for the best surface action.
The Missouri's fish density means fish everywhere, but the best fish hold in specific current seams. A guide float is the fastest way to learn the river's productive lies.
Winter midge fishing on the Missouri is genuinely excellent and often solitary — come in January or February for the complete opposite of a summer crowd experience.
PMD hatches in June produce some of the Missouri's most intense dry fly fishing. Fish are keyed on emergers — CDC and cripple patterns outperform standard dries.
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