Colorado River tailwater trout in prime form as Salt River bass exit the spawn

What's Biting

What's Next

**Tailwater reach (Colorado River):**

With the dam holding the tailwater at 55°F, water temperature changes little from one day to the next — the variable to watch is flow volume. At 6,680 cfs the run is manageable for wading along shallower gravel edges, but the heavier mid-river water is better covered from a drift boat. Concentrate on current seams where faster water shoulders into slower pockets: that is where trout hold at moderate flows, and where a properly mended drift draws the most attention.

The waning crescent moon gives dark mornings through the coming days, which typically extends feeding activity into mid-morning on tailwaters rather than compressing it to the first gray light. Getting on the water by 6 a.m. positions you for that low-light window. Hatch Magazine's caddis-emergence coverage underscores the value of matching the insect cycle — a size-16 to 18 soft-hackle or elk hair caddis swung or presented dry should produce well as light drops in the afternoon. Through mid-morning, MidCurrent highlights that midge patterns built for clear tailrace water — a size-20 to 22 zebra midge or RS2 under an indicator — remain the most reliable daytime setup when no visible surface activity is present.

If releases increase with afternoon power demand, trout will pull tighter to inside bends and structure. Stay mobile and check conditions at the gauge before committing to a stretch.

**Salt River:**

The post-spawn window is brief and concentrated. Tactical Bassin documents this transition as one of the most predictable times of year for locating bass: fish that just left the beds school quickly rather than scattering, and when you find them it can produce steadily for hours. The bluegill spawn overlapping the bass post-spawn creates a secondary feeding trigger — largemouth stack near active bluegill beds to ambush, and topwater frogs, weedless poppers, and swimbaits all produce over that shallow structure in the first and last hours of daylight.

Wired 2 Fish's spring bass breakdown confirms the core mechanic: warming temperatures are the primary driver pushing fish shallow right now. With Phoenix-basin air temperatures building fast through late May, expect the most productive topwater window to compress toward first light as surface water temps climb. Midday anglers should transition to a drop-shot or swimbait along deeper structure or shaded rocky cuts to stay on fish as they push off the flats.

Context

Mid-May sits squarely in the transition zone for both Arizona river systems, and historically this is one of the more reliable stretches of the season on each.

The Colorado tailwater below Glen Canyon Dam runs cold and clear year-round, and 55°F is close to the long-run average for this reach regardless of season. What distinguishes mid-May from March and April is lower pressure: spring-break traffic has cleared, but summer heat has not yet pushed the fishery into the compressed early-and-late daily windows that define July and August. Insect activity on tailwaters across the Southwest typically builds from May into early June, making this a favorable window for surface and near-surface presentations — consistent with the caddis and tailrace midge context noted by Hatch Magazine and MidCurrent in this cycle's coverage.

On the Salt River, the post-spawn bass transition in mid-May mirrors the early-summer shift that Tactical Bassin documents as one of the most predictable fishing patterns of the year. Bass moving off beds and into their summer-feeding posture is a consistent annual event for this region, and the bluegill spawn acting as a secondary trigger is a well-established seasonal dynamic in Arizona's warm-water lakes and river arms.

No angler-intel feeds this cycle provided direct on-the-ground reporting from the Colorado River tailwater or the Salt River specifically. The sources consulted focused on bass fishing in Texas and the Southeast, striper migration in the Northeast, and fly-fishing content from the Mid-Atlantic and Vermont. The USGS gauge 09380000 reading is the most concrete current data point available for this region. The species and technique outlook above is grounded in that gauge reading combined with broadly applicable seasonal patterns — it is not a local shop or charter report from this week. For real-time Salt River conditions, checking with a Phoenix-area tackle shop before heading out is the best move.