Colorado River tailwater trout in prime form as Salt River bass turn post-spawn

What's Biting

What's Next

**Days ahead on the Colorado (Lees Ferry)**

With flows holding at 8,070 cfs (USGS gauge 09380000 reading as of May 17 evening), expect the tailwater to remain a boat-and-bank-access fishery for the next several days unless release volumes from the dam shift. At 56°F, rainbow trout will be feeding actively, with the prime windows concentrated in the first two hours after sunrise and the last 90 minutes before dark. Midday heat arrives quickly in the canyon corridor this time of year; once air temps climb, fish stack into deeper runs and pocket water where cold upwellings hold them comfortable.

Nymph rigs fished deep on a tight-line or indicator setup are the workhorses under high-flow conditions. MidCurrent's weekly fly-tying coverage highlights sparse midge-style patterns specifically designed for "clear, pressured water of stillwaters and tailraces" — a description that maps directly onto the Lees Ferry run below the dam. Soft hackles and small midge dries in the surface film can also produce during evening lulls. A New Moon this cycle (May 18) reduces light pressure overnight, which can push larger rainbows into shallower feeding lanes near dawn before the canyon floor heats up.

**Days ahead on the Salt River**

Mid-May marks the post-spawn transition for largemouth bass across the Salt River corridor. Water temps in the system's slower backwater stretches are running warmer than the Lees Ferry tailwater — likely in the mid-60s to low-70s°F range, though no gauge data is available for the Salt in this report. Tactical Bassin (blog) covered post-spawn bass fishing this week across comparable inland fisheries, noting that schooling behavior kicks in once fish abandon the beds, and that swimbaits, chatterbaits, and finesse rigs all produce efficiently once you locate a pod. Early morning is the window for topwater over shallow points and gravel flats; by mid-morning, shift to shaded rock structure and deeper channel edges where fish consolidate against rising heat.

Channel catfish on the Salt should be entering one of their most active pre-spawn feeding periods as water temperatures climb toward their preferred range. Bottom rigs with cut bait near deeper shaded holes are the conventional approach — both dawn and dusk typically outperform midday by a wide margin.

Context

Mid-May on the Colorado River at Lees Ferry is generally one of the more reliable trout windows of the year. The tailwater below Glen Canyon Dam maintains cold, clear water throughout all seasons — 56°F is consistent with typical May readings, as reservoir stratification at Lake Powell delivers consistently cold releases regardless of air temperature above the canyon rim. Flows at 8,070 cfs are on the moderate-to-higher end of the spring range; historically the river can run anywhere from roughly 4,000 to 13,000-plus cfs depending on operational decisions, so current conditions are fishable by boat and from accessible banks but challenging to impossible for wade anglers in the main channel.

For the rainbow and brown trout fishery at Lees Ferry specifically, mid-May sits in the productive stretch between cold winter lows and peak summer heat that can concentrate fish in progressively deeper water. No angler-intel feeds in this cycle offered direct reports from the Lees Ferry stretch or the Salt River system, so comparison to typical seasonal conditions is the most honest framing available here.

The Salt River is a structurally different fishery — a warmer-water, dam-regulated system above the greater Phoenix metro area, where largemouth bass historically complete spawning in April to early May depending on elevation and year-to-year temperature timing. Mid-May is typically the beginning of a productive post-spawn period when fish school up and feed aggressively before midsummer heat pushes them into deeper thermal refuge. Whether this season is running early, on schedule, or behind cannot be determined from the intel available in this cycle — anglers with recent on-water time from either system are encouraged to share observations.