Truckee Trout Turn to Crayfish and Mayflies as Cooling Sets In

What's biting

What's next

Per Reno Fly Shop guide Aden Breckner's latest on-the-water report, water temperatures on the Truckee River corridor are expected to drop over the next several days, and that cooling should sharpen feeding windows that have been running short during the current hot stretch. Right now bug life is thin, and the shop notes fish are relying on crayfish patterns and mayfly imitations early in the day on both the California and Nevada sides of the river — expect that early window to hold or even widen slightly as mornings cool into early September.

If the cooling trend holds through the coming week, look for a longer top-of-day bite window and potentially better midday action than the current heat has allowed, since Reno Fly Shop's late-July report already flagged hot air temperatures pushing peak feeding earlier and shortening the productive window by midday. Anglers planning around the upcoming holiday weekend should treat early mornings, particularly the first couple hours of light, as the highest-percentage window on Truckee River water — the shop's guidance has been consistent on getting out early and working water toward the California side where temperatures run a touch cooler.

For stillwater options in the high country, Reno Fly Shop's Heenan Lake primer points to the gated Alpine County lake off Highway 89 near Markleeville as a lower-pressure alternative carrying California Department of Fish and Wildlife's freshly stocked Lahontan cutthroat trout — a fishery the shop compares favorably to the more heavily fished Pyramid Lake. That's a solid backup plan on any day the Truckee gets crowded or afternoon temperatures spike again.

One caveat: live flow and temperature telemetry from USGS gauge 10265200 wasn't reporting during this cycle, so none of the above can be pinned to an exact cfs or degree reading right now — treat the shop's "temperatures dropping" call as the best available signal until gauge data resumes. If flows stay stable and cooling continues as described, the standard late-summer-into-fall transition for this stretch should follow: shortening midday lulls, lengthening morning and evening windows, and increasing mayfly activity as water temperatures ease off their summer peak. Carp fishing on the Nevada side of the system has reportedly been strong per the shop and is worth a look if trout timing doesn't line up with your schedule.

Context

Late August is typically a transition period for Eastern Sierra trout water along the Truckee River corridor, as the warm-afternoon lull of summer starts giving way to cooler mornings and improving mayfly activity heading into fall. Reno Fly Shop's on-the-water reports through late July and mid-August this season have consistently described the same pattern: fish keying on crayfish and mayfly imitations early, then a midday lull as air temperatures climb and push the trout's peak feeding window earlier in the day. That's a fairly standard late-summer rhythm for this stretch rather than anything unusual this year.

Heenan Lake's stocking cycle, per the shop's season primer, also reads as routine — California Department of Fish and Wildlife releases Lahontan cutthroat trout there annually after their spawning work, continuing the lake's long-running reputation (alongside Pyramid Lake) as a go-to fishery for the strain.

We don't have a direct year-over-year comparison in this week's angler intel, and with USGS gauge 10265200 not reporting current flow or temperature data, it's honestly not possible to say with confidence whether this season is running warmer, cooler, drier, or wetter than a typical late August in the Eastern Sierra. What's available points to a normal seasonal transition rather than an anomaly, but that should be treated as a directional read, not a confirmed comparison.