Fall Chinook passage at Bonneville Dam, monitored daily by the U.S. Army Corps of Engineers and Fish Passage Center, reached approximately 424,000 adults through early October 2026, placing the season among the stronger recent runs. Daily counts in late September and early October averaged 1,500–2,300 fish, consistent with historical 50% passage timing near early September but slowed by elevated river temperatures that reduce upstream migration speed for Snake River stocks. In-season updates from the Columbia River Technical Advisory Committee project a total adult return near 606,000 at the river mouth, with dam counts reflecting downstream harvest and continued movement through October. Daily visual sampling distinguishes bright and tule stocks, while upcoming model runs and TAC assessments on or after October 5 will refine remaining passage estimates before the October 31 cutoff.