Canyon Ferry walleye active as Montana trout rivers brace for drought

What's biting

What's next

With summer heat rapidly building across Montana, the next few days will continue pushing water temperatures higher on freestone stretches of the Yellowstone and its tributaries. MT FWP has been direct about this trajectory: lower-than-average snowpack this winter, combined with a summer forecast running hotter and drier than normal, means trout anglers should plan tightly around the coolest windows of the day. Early morning from first light through mid-morning and the final two hours before dark are where action will concentrate on most river stretches as midday temperatures climb.

On the tailwater sections of the Missouri River, regulated flows below Canyon Ferry and its downstream reservoirs keep water temperatures more consistent than on freestone drainages, making this corridor increasingly attractive as summer heat peaks. Expect PMD (Pale Morning Dun) and caddis hatches to continue through late morning, with caddis activity picking up again toward dusk. Late June typically brings Yellow Sally stonefly activity to Yellowstone drainage rivers as well, which can produce reliable dry-fly windows in the afternoon on open, less pressured stretches.

The waxing gibbous moon through the end of this week means good ambient light in the evenings and post-sunset period, which tends to extend surface feeding activity for trout already primed by summer hatches. Consider extending your evening outings where access and regulations allow.

Canyon Ferry Reservoir is worth dedicated attention for walleye through this period. MT FWP Fishing News is specifically asking anglers to keep the smaller walleye they catch this season, a proactive management call to reduce competition among smaller fish and let the reservoir's larger walleye reach their full growth potential. Standard walleye tactics with jigs or crawler harnesses along deeper weed edges and basin breaks should produce through the end of June.

Watch for potential hoot-owl restriction announcements on blue-ribbon Yellowstone tributaries if heat intensifies. The TroutCast tool, developed by USGS and Montana State University and spotlighted by MT FWP at their recent virtual townhall, forecasts drought thresholds in real time on Montana's premier rivers. It is worth bookmarking at troutcast.usgs.gov before any long drive to a high-profile stream.

Context

Late June in Montana's Yellowstone and Missouri drainages typically marks the transition from spring runoff to summer low-water patterns. In a normal snowpack year, the Yellowstone River and its upper tributaries would be coming off peak runoff by mid-June and dropping toward fishable summer flows by the last week of the month. This year's picture appears different.

MT FWP Fishing News has been explicit that 2026 brought lower-than-average snowpack, meaning rivers in both drainages likely dropped earlier and faster than historical norms. That is a mixed signal: earlier clarity and fishability in May and early June, but also a higher risk of critically warm temperatures before summer's end. The agency's decision to host a dedicated virtual townhall on summer fishery protections and launch the TroutCast drought-forecasting tool reflects how seriously FWP is treating this season's risk profile for blue-ribbon fisheries.

On the Missouri tailwater, regulated flows from the Canyon Ferry reservoir system insulate that fishery from runoff and drought variability far better than freestone rivers. Canyon Ferry Reservoir itself is a historically productive walleye fishery: MT FWP notes the first walleye were captured there in 1989 during rainbow trout fall netting operations, and the population has since grown to the point where the agency is now actively managing for size structure by encouraging harvest of smaller fish.

Hatch Magazine's ongoing discussion of bull trout targeting ethics is a relevant backdrop for Yellowstone drainage fishing this time of year. Bull trout are a federally sensitive species found throughout upper Yellowstone tributaries, and their presence signals ecosystem health worth protecting. No direct charter, shop, or guide catch reports for Montana were available in this data cycle, so conditions noted above are drawn from MT FWP's public management communications and applied alongside typical late-June seasonal patterns for the region.