Sacramento-Delta Settles Into Its Fall Water Pattern

What's next

Look for water temps across these gauges to keep drifting down a degree or two over the next several days as nights lengthen under the current waning crescent moon, a normal early-October trend for the Delta system. Flow at gauge 11447650 should hold close to its current 7,870 cfs mark through the weekend barring rain, keeping clarity and current speed fairly consistent for anyone planning a trip.

The window worth watching is the first real dip below the mid-60s at these gauges, since that kind of cooling is usually the trigger that shifts Delta fish behavior into a more active fall pattern. Check gauge readings again in a few days before committing to a specific stretch, and plan around stable or falling flow rather than a spike.

Context

Mid-60s water temps in early October are right on schedule for the Sacramento-Delta, which is in the middle of its seasonal transition out of summer thermal stratification and toward the cooler, more stable water that typically holds through late fall. Flow in the high-7,000s cfs range at the lower gauge is consistent with normal post-summer Delta outflow, ahead of the volume increases that usually arrive once winter rains start.