Post-Spawn Largemouth and Shad Run Converge in the Sacramento Delta
USGS gauge 11447650 logged 70°F water and 9,380 cfs on the morning of May 25, placing Sacramento-Delta largemouth bass firmly in post-spawn transition. Wired 2 Fish published a detailed post-spawn breakdown this week noting that fish divide between aggressive open-water feeding on shad spawns and spooky, shallow-holding behavior near their beds. Topwater presentations during low-light windows can produce, with midday fish pulling to deeper channel structure. Forum reports on The Fly Fishing Forum describe a strong shad run developing on the American River upstream, with one angler counting more than 20 fish to the net in a two-hour evening session and landing a bonus Sacramento pikeminnow exceeding 30 inches. Shad movement on the Sacramento system typically peaks through May and draws striped bass into tidal corridors below. Flow at 9,380 cfs is moderate for late May, keeping the system accessible across the Delta.
Current Conditions
- Water temp
- 70°F
- Moon
- First Quarter
- Tide / flow
- USGS gauge 11447650 reading 9,380 cfs; moderate late-May flow with full Delta access and no flood-stage concerns.
- Weather
- Check local forecast before heading out.
New to these readings? What do water temp, cfs, tide, and moon phase actually mean for fishing?
What's Biting
Largemouth Bass
topwater along tule edges at dawn, finesse drop shot on channel structure midday
Striped Bass
deep-diving plugs at channel confluences, follow shad schools at dawn
American Shad
fly or light spinning tackle in evening current on moving water
What's Next
Over the next two to three days, the Delta's 70°F water is likely to hold steady or tick slightly warmer as late-May afternoon heat builds in the Central Valley. That temperature matters most for striped bass: at 70°F, stripers sit at the warm edge of their feeding comfort zone, so morning and evening windows will yield the most consistent action while midday sees fish push deep into cooler channel structure.
For largemouth bass, Wired 2 Fish's post-spawn breakdown published this week offers a practical road map. Post-spawn fish split simultaneously into two behavioral groups: aggressive individuals gorging on shad spawns in open water, and spooky shallow-holders still recovering near their beds. The best approach is to address both. Run topwater baits, including walking lures, poppers, and hollow-body frogs, along tule edges and dock lines during the first two hours of daylight. Once sunlight penetrates the shallows, pivot to finesse presentations. Drop shots, Neko rigs, and small swimbaits worked slowly against channel edges, dock pilings, and submerged timber will pick up the reluctant fish that topwater will not reach.
Shad movement is the organizing force for the broader Delta system right now. The Fly Fishing Forum posts productive evening sessions on the American River with counts exceeding 20 fish per outing. That is single-source forum chatter and should be treated accordingly, but the American shad run on the Sacramento system typically intensifies through May, and shad concentrations in the tributary system reliably pull striped bass into the lower tidal channels. Watch channel confluences at dawn for breaking fish and diving birds. Trolling deep-diving plugs along main river channels or jigging at transition zones are both consistent striper producers in this window.
The First Quarter moon falls today, May 25. Solunar activity during First Quarter phases typically generates moderate bite windows keyed to dawn and dusk rather than a standout midday period. Plan around sunrise Saturday and Sunday for the best topwater window. An evening return after 6 p.m., particularly in moving water near a tidal push, should offer the day's second reliable opportunity.
Flow at 9,380 cfs is fishable throughout the Delta with no flood-stage access concerns. Tule flats remain approachable for shallow-draft boats, and main channel depths allow presentations across multiple depth zones.
Context
Late May is a natural inflection point for the Sacramento-Delta calendar. Water temperatures in the 68 to 72°F range are typical for this stretch of the season, as Sierra Nevada snowmelt runoff begins tapering and Central Valley daytime temperatures drive surface warming. The 70°F reading from USGS gauge 11447650 is on schedule: neither early nor late for the region at this date.
Flow at 9,380 cfs reflects a mid-range late-spring discharge. The Sacramento River can run considerably higher during heavy snowmelt years, sometimes pushing well above 20,000 cfs in April and early May. At 9,380 cfs, conditions fall into the productive middle range: enough current to concentrate shad and stripers at main channels and confluence points, without the high, off-color water that can complicate boat control and shut down sight fishing.
The American shad run is one of the more predictable seasonal windows in the Delta fishing calendar. Shad typically stage in the American River and lower Sacramento system from April into early June, with May being the peak period. At 70°F, the system sits at the warm trailing edge of prime shad-run temperature. The run should remain active for the next two to three weeks before summer heat pushes it toward conclusion.
Striped bass historically follow shad migrations from San Francisco Bay into the Delta through spring, transitioning from the active spring push toward deeper, cooler summer holding patterns as June approaches. Late May typically represents the last consistent window for striper action in the upper Delta before fish scatter to cooler zones.
No specific comparative data from 2026 was available in the angler-intel feeds to assess whether this season is tracking ahead of, behind, or on the historical average. The temperature and flow figures from USGS gauge 11447650 are consistent with normal late-May conditions for this region.
This report is synthesized by Hooked Fisherman from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Source names are cited inline where they appear. Check local regulations before keeping fish. Never trust a single source for a trip decision.