**Current cumulative adult Chinook passage at Bonneville Dam stands at approximately 431,295 fall Chinook through October 13, 2026, with daily counts declining from over 1,000 in early October to 247–373 in mid-month.** Fall Chinook, the dominant component of late-season passage, typically see 50% passage by early September per historical timing data from the Fish Passage Center and Columbia Basin Research DART. Remaining October passage depends on run strength (preseason forecasts projected ~600,000 adults at the mouth), river flows near 80–90 kcfs, and water temperatures influencing upstream migration timing. Daily visual and video counts by the U.S. Army Corps of Engineers will continue updating totals through October 31, with any late surges or weather-driven changes in conditions serving as the main variables for market resolution.