Snake & Salmon steelhead run at record lows as water cools into fall
USGS gauges across the Snake and Salmon system are reading 56 to 62°F this week, with the larger reaches running 3,200-3,280 cfs and the smaller water down at 1,350 cfs, a clean fall thermal split across the basin. The headline for anyone targeting steelhead is sobering: per Hatch Magazine, this year's Columbia and Snake River steelhead run is on pace to be the smallest ever recorded, with just over 52,000 fish tallied above Bonneville Dam since counting began July 1. That run has been building slowly all summer and remains well off historical pace, so steelhead water that would normally be turning on with the first real cool-down is still fishing slow this week.
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Expect the cooling trend to continue through the next several days as we move deeper into fall; water in the 56-62°F range should keep sliding lower on the smaller tributary (currently 62°F) while the bigger reaches hold steadier in the high 50s. That kind of gradient typically pulls fish activity earlier in the day as afternoons stay milder than mornings.
Tonight's full moon is worth planning around for a low-light bite window, and with the steelhead count still climbing only slowly at Bonneville, anglers focused on that fishery should treat any push upriver as gradual rather than a single wave. The better near-term play is watching the smaller tributary's faster cool-down for the first real signal that fall patterns are locking in on the mainstem too.
Context
Water temperatures in the mid-to-upper 50s are right on schedule for late September in this basin, as the system transitions from summer to fall thermal regimes. What's not on schedule is the steelhead run itself: a record-low count through Bonneville Dam this deep into the season is a genuine outlier against typical fall steelhead timing for the Snake River system, and it's the one number worth tracking closely as the season progresses.
Synthesized from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Check local regulations before keeping fish. Never trust a single source for a trip decision.
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