Delta reverse flow puts stripers and bass in play for Memorial Day weekend
USGS gauge 11455420 recorded a strong reverse flow of 5,270 cfs, running negative toward the Bay, in the early hours of May 24, a tidal condition that typically concentrates baitfish along channel edges and puts predators on the feed across the Sacramento-San Joaquin Delta. NorCal Fish Reports maintains an active Delta reporting section heading into the Memorial Day stretch, though detailed catch tallies were not available in this cycle's update. On the technique side, Wired 2 Fish spotlights shallow topwater presentations during low-light windows around grass, reeds, and dock structure as a productive approach, a pattern that maps directly onto Delta slough fishing at this stage of the season. Striped bass are likely settling into their post-spawn distribution across main channels and larger sloughs, while largemouth bass are transitioning off beds and beginning to re-engage on the feed. First Quarter moon tides are building tidal push, making current-seam timing the key variable for the days ahead.
Current Conditions
- Moon
- First Quarter
- Tide / flow
- USGS gauge 11455420 shows reverse flow of -5,270 cfs toward the Bay; time presentations to tidal transitions for best results.
- 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
Striped Bass
drifting swimbaits or live bait along channel edges at tidal current seams
Largemouth Bass
dawn topwater around grass, reeds, and docks; post-spawn soft plastics near tule mat edges
Channel Catfish
bottom rigs in deeper sloughs as late-May water temperatures climb
Black Crappie
small jigs near submerged structure and tule edges during low-light windows
What's Next
The reverse-flow reading at gauge 11455420 points to active tidal exchange between the Bay and the Delta interior. Over the next two to three days, expect these tidal cycles to continue driving where fish stage and feed. On outgoing tides, striped bass and largemouth typically push toward current seams at channel junctions, feeding on baitfish swept off adjacent flats. On incoming tides, both species often pull back toward the mouths of sloughs and tule-lined staging areas where prey gathers.
With the First Quarter moon, tidal swings will build in intensity through the week, sharpening current seams and creating more defined feeding windows. Plan your sessions around the two to three hours bracketing each major tidal transition. Early morning low-light windows remain the highest-percentage time for largemouth bass on topwater, particularly along tule banks, reed mats, and dock structures. Wired 2 Fish highlights this exact approach for covering water quickly and drawing reaction strikes from fish holding near shallow cover, and it translates directly to Delta slough conditions in late May.
For striped bass, Memorial Day weekend historically finds fish distributed broadly through the Delta as the post-spawn scatter completes. Larger fish tend to favor the deeper main channels and confluence zones where tidal current concentrates bait. Swimbaits, soft-plastic jerkbaits, and live bait drifted along channel edges are worth cycling through as tidal stages shift. Focus drift presentations on the seams where moving water meets slower back-eddies.
Largemouth bass transitioning out of the spawn may be temporarily lethargic directly after leaving beds, but late May typically sees them re-engage relatively quickly. Soft plastic worms and creature baits punched through tule mats or fished on a Texas rig near deeper adjacent structure are reliable post-spawn options alongside the topwater bite at first light.
No weather data was available for this report. Check the local forecast before heading out, and factor in elevated Memorial Day weekend boat traffic, which can push fish off shallow structure during midday hours and makes early morning launches especially worthwhile.
Context
Late May is one of the more active transitional windows on the California Delta. Striped bass have typically moved through the upper Sacramento River spawning push by mid-May and are beginning to redistribute back through the tidal waterways, making the Delta a productive intercept zone before summer heat drives the largest fish toward the Bay and deeper, cooler water. For largemouth bass, late May marks the tail end of the spawn and the start of the post-spawn feed-up, with fish gradually relocating from shallow bed sites to deeper adjacent structure and channel margins.
The negative flow reading at gauge 11455420 is not unusual for this time of year. Reverse and oscillating flows are a routine feature of the Delta's tidal hydrology, shaped by San Francisco Bay tides interacting with the southward draw of the State Water Project pumps. The magnitude of the reverse reading noted in this cycle suggests a strong tidal draw, which can push bait and temporarily concentrate predators along specific channel edges in ways that reward anglers who time their drifts carefully.
NorCal Fish Reports covers the Delta region consistently through the spring run, and late May is generally treated by NorCal fishing media as a reliable striper and bass window before the summer pattern shifts fish toward cooler Bay waters and deeper Delta channels.
Historically, channel catfish begin moving toward shallower feeding zones in this period as water temperatures push toward the 65 to 70 degree range. No temperature data was available from today's gauge, so precise thermal staging of species cannot be confirmed this cycle. Water temps across the Delta can vary by several degrees depending on location, flow exposure, and time of day, so checking recent conditions at your specific launch site before targeting temperature-sensitive species is worthwhile.
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.