Colorado River tailwater trout prime as Salt River bass wrap post-spawn

What's Biting

What's Next

The Waxing Gibbous moon building toward full will amplify low-light feeding windows over the next two to three days. On the Colorado River tailwater below Glen Canyon Dam, flows at 8,140 cfs are consistent with late-May power-generation releases, which can hold steady or tick upward on weekdays before sometimes easing on weekends. If weekend releases moderate, the cobble bars and inside bends at Lees Ferry become more accessible on foot; at current levels, a drift boat or guided float is the most efficient way to work the seams.

With water temperature stable at 58°F in this tailwater, rainbow trout activity should hold consistent regardless of air temperature — which across the Arizona desert will likely push well past 100°F by midday. Early-morning sessions capture both cooler air and the tail end of the moon-enhanced feeding push. MidCurrent's current tying roundup highlights midge-style patterns that perform well in clear, pressured tailrace water — a description that maps directly onto the Lees Ferry fishery. Small midges, Pheasant Tail nymphs, and low-profile soft hackles drifted through the deeper run lines and current seams should be the first approach.

On the Salt River reservoir chain — Saguaro, Canyon, Apache, and Roosevelt lakes — largemouth and striped bass have largely completed the spawn and are fanning out into early-summer feeding structure. Wired 2 Fish's post-spawn breakdown this week identifies two behavioral camps: aggressive feeders gorging on baitfish in open feeding lanes, and shallow, spooky fish requiring finesse work. Tactical Bassin's post-spawn reservoir coverage recommends adapting to water clarity: power presentations like swimbaits and chatterbaits in darker or stained sections, and finesse rigs in clearer main-lake water. The Salt River chain offers both conditions depending on which arm you are fishing.

Striped bass on the lower Colorado River tend to be most active at the low-light edges of the day as late-May surface temperatures climb. Target the first 90 minutes after sunrise and the last hour before dark on main-lake points and submerged ledges. The building moon through the weekend only sharpens those windows.

Across both systems, plan around the cool bookends of the day. Once air temperatures peak midday, both angler comfort and fish activity drop off sharply in this desert environment.

Context

Late May on the Colorado and Salt Rivers sits at the cusp of the productive spring season and the long Sonoran Desert summer. By Memorial Day weekend, midday air temperatures in the river corridors of central and northern Arizona routinely exceed 100°F, compressing worthwhile fishing into the early-morning and late-evening hours. This seasonal pinch is typical and not a sign of unusual conditions — it is simply how these systems operate each year at this time.

The 58°F water temperature at USGS gauge 09380000 is characteristic of the Lees Ferry tailwater across all seasons. Glen Canyon Dam draws from the cold depths of Lake Powell and releases water at a relatively stable temperature year-round — generally 46 to 52°F in winter, rising to 56 to 63°F by late spring as the reservoir's thermocline shifts. The current 58°F reading is squarely on schedule for the last week of May. The 8,140 cfs flow is on the moderate-to-high side for late May at this gauge. Flow management at Glen Canyon Dam has varied considerably in recent years as managers balance Lake Powell water levels against downstream delivery commitments. Higher flows shift the fishing geometry toward eddies and slower side channels and away from the classic wade-fishing bars, but they do not close the fishery.

For the Salt River bass fishery, post-spawn timing in late May aligns with historical norms for Arizona. Desert Southwest bass typically complete the spawn two to four weeks ahead of most northern U.S. fisheries, meaning the last week of May is reliably a post-spawn period here. No direct local intel from Arizona-based shops, charters, or state sources was available in this reporting cycle. The context above draws on gauge data and general seasonal knowledge of these systems. Contacting local outfitters along the Salt River corridor or in the Page area before heading out will give you the most current on-the-water picture.