Spring Chinook push on Columbia tributaries as mid-May temps settle in

What's Biting

What's Next

With water temperatures at 52°F and flows running at 1,280 cfs, Columbia basin tributaries are positioned well for the next several days of the spring Chinook push. As temperatures trend toward the upper 50s — the peak feeding band for adult Chinook — anglers should expect activity to hold steady or improve on main-stem runs and lower-tributary staging areas.

The New Moon phase (May 17) creates the darkest nighttime conditions of the month. For salmon, this often correlates with stronger daytime feeding windows, as fish that have been holding during bright-light periods move and feed more aggressively. Plan morning and late-afternoon sessions around deep, oxygenated runs and current seams where fast water transitions to slow — these are classic staging lanes for upriver Chinook. Deep drift rigs and heavy spoons worked near the bottom should be the primary presentations.

For Puget Sound tributary rivers, springtime flows are typically governed by snowmelt timing from the Cascades. With no gauge data available for Puget Sound-side rivers in this cycle, anglers should check USGS real-time data or WA WDFW Fishing Reports before launching. If temperatures on Puget Sound tributaries mirror the Columbia basin reading, cutthroat and rainbow trout will be holding in moderate flows; nymph and emerger presentations should draw strikes during midday hatch windows.

Looking ahead two to three days: if the typical late-May warming trend holds, water temps should edge toward 54–56°F — ideal for both Chinook salmon (still well within their preferred 45–60°F band) and smallmouth bass beginning to feed aggressively in the mid-Columbia main stem. Anglers targeting smallmouth should work slower-moving side channels and rocky point structures where warming water concentrates baitfish.

Steelhead anglers have a narrowing window by mid-May. Late-run fish remain possible in select drainages, but retention regulations on many Columbia tributaries will have shifted — verify with WA WDFW Fishing Reports before targeting them. The weekend of May 17–18 otherwise looks like a solid window: New Moon conditions reduce surface glare, moderate flows keep boat and wading access manageable, and Chinook numbers should be building toward their late-May peak.

Context

Mid-May sits at the heart of the spring Chinook season on the Columbia River system, a run that typically peaks between late April and late May depending on the specific drainage. Water temperatures in the low 50s°F are precisely where spring Chinook thrive and feed most actively; as temperatures push past 60°F in early summer, metabolic stress rises and the bite typically falls off sharply. The current 52°F reading at USGS gauge 14113000 is on-schedule for this time of year.

A flow of 1,280 cfs is within the range typical for late-spring Columbia-basin tributaries, though specific year-over-year comparisons are not possible from the current data payload. Columbia tributary flows at this time of year are heavily influenced by Cascade snowpack and the pace of spring melt, which varies considerably year to year. No angler-intel source in this cycle offered comparative run-timing or harvest data for Washington — WA WDFW Fishing Reports was the only in-state source represented, and its current feed did not carry run-timing notes.

WA Sea Grant's ongoing monitoring work in Washington estuaries provides useful ecological context: Pacific tomcod were documented for the first time in Grays Harbor Crab Team trap surveys in fall 2025, a reminder that forage species are actively moving through Washington coastal systems. Columbia and Puget Sound tributary conditions are governed more by inland hydrology and snowmelt timing than by coastal ocean temperatures, so this signal is contextual rather than directly predictive.

For Puget Sound tributaries, mid-May historically marks the transition away from winter-run and spring steelhead toward summer low-water conditions. Cutthroat and rainbow trout fishing on Puget Sound rivers tends to hold well through June before flows drop and fish seek thermal refuge in deeper pools. Without run-timing bulletins or guide reports from the Puget Sound drainage in this cycle, it is not possible to say definitively whether 2026 is running early or late relative to historical norms.