Spring Chinook window peaks across Columbia system tributaries

What's Biting

What's Next

With water temperatures holding at 53°F and flows at 1,240 cfs (per USGS gauge 14113000), Columbia system tributaries are in a productive mid-spring window. Temperatures in this range — roughly 50–56°F — represent the sweet spot for spring Chinook activity: fish are moving with intent but pausing to rest in deeper holding water, making them targetable rather than running through faster than anglers can cover the water.

Over the next two to three days, mid-May weather across the Columbia corridor typically brings variable afternoon winds out of the west with possible overnight temperatures dropping into the 40s at higher elevations. That diurnal pattern tends to push additional snowmelt into tributaries as the week progresses, which can nudge flows modestly higher and temporarily reduce visibility in upper reaches. Watch for any overnight rain events in the Cascades, which can accelerate runoff and temporarily blow out smaller tribs — the mainstem Columbia handles these pulses better and often produces well in slightly off-color conditions as salmon lose some of their wariness. If visibility holds at two feet or better, back-trolling plugs along current seams is the go-to; when stain increases, side-drifting cured eggs in a brighter color pattern tends to keep fish eating.

For spring Chinook, the New Moon window through mid-to-late May is historically one of the most productive timing periods on the lower and mid-Columbia. Low-light feeding behavior is heightened around new and full moons — plan to be on the water at first light and again in the final 90 minutes before dark. Holding water on the inside edges of current seams and deeper tailouts deserves the most attention during this phase.

Smallmouth bass on the Columbia mainstem should be transitioning fully into post-spawn mode by late this week as water temperatures push toward the mid-50s. Tactical Bassin (blog) notes that post-spawn bass tend to school together and become very catchable once located, and that finesse presentations including drop-shot rigs are among the most consistent producers during this transition. Rocky Columbia points and rip-rap banks are the primary structure; topwater walking baits become increasingly viable as surface temperatures warm through midday.

Rainbow and cutthroat trout in Puget Sound-draining rivers remain active throughout this temperature range. Hatch Magazine's coverage of caddis emergences emphasizes that mid-spring hatches reward anglers who match the specific emergence stage — soft-hackle wets and CDC emerger patterns in size 14–16 are worth having ready as afternoon air temperatures climb and surface activity picks up.

Context

Mid-May on the Columbia system sits at one of the most anticipated junctures of the Washington freshwater calendar. Spring Chinook — the earliest and often largest of the Columbia's salmon runs — typically peak through the lower and mid-Columbia between April and early June, with run timing influenced heavily by ocean survival conditions the preceding year and the pace of Cascade snowmelt driving spring flows. Water temperatures in the low-to-mid 50s°F are historically consistent with this window, and the 53°F reading from USGS gauge 14113000 on May 18 aligns with a normal or very slightly warm mid-spring progression. No anomalous warmth or cold-water lag is evident from the gauge data alone.

Flow at 1,240 cfs at the gauge site represents a late-spring runoff level that is neither flood-stage nor low-water stress. For mid-Columbia tributaries, this range generally provides fishable conditions with adequate depth in key holding lies and enough current to keep salmon oriented on predictable migration paths.

For Puget Sound rivers — the Green, Snoqualmie, Skykomish, and similar systems — mid-May typically marks the tail end of winter steelhead seasons in most drainages and the early-season arrivals of summer-run fish in a handful of systems. WA Sea Grant's ongoing estuarine monitoring work in Washington waters documented Pacific tomcod appearing in Grays Harbor traps in fall 2025, a reminder that the broader watershed ecosystem continues to shift and that non-target species worth noting are moving through the system.

No comparative year-over-year intel from charter captains, tackle shops, or WA WDFW creel interviews surfaced in this reporting cycle to characterize how this season's runs stack up against the five-year average. For trip-planning purposes, NOAA's preseason run-size forecasts and WA WDFW's weekly in-season updates are the most reliable sources for that comparative context.