Canyon Ferry walleye active as drought pressure builds on Montana trout rivers

What's biting

What's next

The next several days on both the Yellowstone and Missouri drainages should reflect the wider seasonal picture flagged by MT FWP Fishing News: hotter and drier than normal, with below-average snowpack now translating into lower and potentially warmer river flows as summer progresses.

On Canyon Ferry Reservoir, walleye fishing should remain productive into early July before rising surface temperatures push fish into deeper structure. Walleye were first captured in the reservoir in 1989 during routine netting, per MT FWP Fishing News, and the population is robust enough that the agency is actively encouraging selective harvest of smaller fish. Follow that guidance: keep the eaters, let the trophies go.

For trout anglers on the Yellowstone, late June marks the shift into terrestrial season. Hopper-dropper rigs typically come into their own as grasshoppers move into river-edge meadows. PMD hatches and summer caddis runs remain reliable morning and evening bets on the Missouri tailwater and the upper Yellowstone. No specific hatch reports from local shops or guides were available in this report's intel window, but the calendar timing is right for the classic late-June dry-fly window.

Drought years compress the productive daily fishing window. Trout can experience heat stress when water temperatures push above 67 to 70 degrees Fahrenheit in the afternoon. Target first light through late morning, then return in the evening after the water cools. MT FWP's TroutCast tool (usgs.gov/apps/troutcast, flagged by MT FWP Fishing News) is a practical pre-trip resource for checking drought forecasts on specific river reaches before committing to a wade-fishing outing.

Field & Stream also reports that Montana's Blackfoot River, while west of the Yellowstone/Missouri core, faces active development threats from a proposed gold mine in its headwaters and a data center proposal on its lower reach. Conservation pressure on Montana trout habitat is running on multiple fronts this season, and anglers across the state should stay engaged.

Context

A typical late June on the Yellowstone and Missouri systems brings some of the year's best conditions for trout anglers: post-runoff water clarity, temperatures in the ideal 52 to 62 degree range, reliable PMD and caddis hatches, and the first grasshoppers of the terrestrial season arriving along the banks. Canyon Ferry on the Missouri typically peaks for walleye in spring and early summer before activity shifts to deeper water as surface temperatures climb through July.

This year, the seasonal context carries a cautionary note. MT FWP Fishing News has documented below-normal snowpack from the 2025-26 winter and a summer forecast trending hotter and drier than average. Those conditions historically compress the productive window on freestone rivers, pushing afternoon water temperatures into stress territory earlier in the season and increasing the probability of voluntary or mandated conservation measures on sensitive blue-ribbon reaches by August.

The agency's posture appears proactive. The June 1 launch of the TroutCast drought-forecasting tool and a public virtual townhall on summer fishery concerns, both reported by MT FWP Fishing News, reflect a shift toward early warning rather than reactive management. MT FWP Fishing News also featured coverage of southwest Montana trout populations through its Fish Math educational program, indicating that population monitoring across key drainages remains active. Without live gauge data in this report's intel window, direct flow comparisons with prior years are not possible, but the early-season signals point to a summer that rewards anglers who fish early, adapt quickly, and lean on official MT FWP resources for current conditions.