Fall transition at 61 degrees; vibrating jigs and spinnerbaits on the grass edges, punch if the mats are set up tight.

Water's at 61 degrees and we're in that sweet spot where bass are regrouping after summer and tightening around the grass and slough mouths. The Delta's tidal and can swing from turbid to clearing depending on the wind and tide stage, so you'll need to match your lure color to what you see when you get there. Pressure is steady and even though we've got some clouds, the bite stays consistent through the day when you work the shallow grass lines and channel transitions. Bass are looking up at moving baits and will chase down a reaction lure, especially during the solunar windows and first light. Stay mobile, cover water efficiently with vibrating jigs and spinnerbaits, then punch the thicker mats if they're matted tight with tules or hyacinth.

The day's game plan

Where to fish

• Frank's Tract slough mouths and shallow flats — 2 to 8 feet on the flats, 10 to 15 feet in adjacent channels · Riprap banks, tule edges, isolated grass clumps, flooded hyacinth. Migration ditches between shallow and deep water.
  Frank's Tract is a primary staging area in the fall transition. Bass use the mouths as funnels between shallow feeding zones and deeper refuges. The riprap and tule edges hold bait and provide ambush cover. Grass lines concentrate bass as they regroup after summer dispersal.
• Big Break and Little Mandeville sloughs — 2 to 6 feet shallow, 12 to 18 feet on adjacent channel edges · Tule-lined banks, hyacinth and pennywort mats, hard-bottom flats, riprap pilings.
  These dead-end sloughs are classic fall staging grounds. Bass stage at their mouths and edges as they prepare for winter migration. The tules provide security and the shallow hard-bottom flats are where they feed during cooler-water periods. Water clarity here often differs from the main Delta, so it pays to scout both arms.
• South Delta riprap banks (Old River, Middle River, Victoria Canal areas) — 2 to 8 feet along the banks, 10 to 20 feet in channel axes · Riprap, scattered grass, submerged grass clumps, current breaks from channel flow.
  Riprap holds baitfish and bass stack on it in fall as they follow shad migrations. The hard substrate warms in afternoon sun and attracts forage. South Delta areas are accessible and reliable during the fall transition when bass haven't fully committed to deeper winter structure.

What to throw

• Vibrating jig — Not applicable · Green pumpkin or black and blue · 3/8 oz (Early morning and late afternoon when bass are willing to chase; also midday if fishing deeper transitions and you want a compact profile.)
  Hop and pause along grass edges and isolated clumps. Short snappy twitches followed by pauses let the jig fall and flutter. Keep it near cover.
• Spinnerbait — 1/2 oz standard · White or chartreuse for turbid water, or natural shad colors for clearer water · As stated in color (Early morning, morning transitions, and late afternoon when bass are feeding up. Works well when clarity is mixed.)
  Double-Colorado-blade setup with a 4-inch Keitech swimbait trailer works best. Retrieve steady or slow, allowing the blade to thump and the trailer to catch light and move. Cast to structure and bring it back with a rhythmic cadence.
• Drop-shot rig with Senko — 4 to 5 inches · Green pumpkin, watermelon, or PB&J for clearer water; black or junebug for turbid water · 1/8 oz to 3/16 oz on the drop-shot (Midday when sun is bright and bass are deep and lethargic. Also an excellent finesse option after a front or when the bite turns tough.)
  Tie the Senko wacky on the hook, drop-shot weight below. Cast to the transition or channel edge and soak it vertically or drag it slowly along the bottom with minimal slack. Work it near structure; let gravity do the work.
• Squarebill crankbait — 2 to 2.5 inches · Natural shad if water is clearer; chartreuse-white if stained · 3/8 oz typical (Morning and late afternoon when bass are moving between shallow and deeper water.)
  Cast to the transition line between shallow flat and deeper channel. Retrieve steady with occasional pauses. Deflect it off any submerged grass or riprap; the deflection triggers strikes.
• Hollow-body frog — 2.5 to 3.5 inches · Natural or chartreuse · Not applicable, topwater (Evening when grass mats are set up and bass are shallow, 5 to 7 PM.)
  Cast over isolated grass mats and walk it with a side-to-side twitch. Let it sit briefly on thicker cover then twitch again. Keep the line tight and work the rod tip side-to-side.

How to work it

• Walking a vibrating jig along grass edges — Early morning through mid-morning, then late afternoon through early evening. · Frank's Tract, Big Break, Little Mandeville, 2 to 6 feet, along riprap and tule edges.
  Cast near isolated clumps or along a defined grassline. Maintain bottom contact with short hops, pausing 1 to 2 seconds between twitches. Let the blade thump on the pause.
• Punching through mats with a heavy rig — Early morning and late afternoon if the mats are dense enough. Works best when tide is stable or rising; a hard falling tide collapses mats and pushes fish off them. · Thick tule or hyacinth mats in slough interiors, 2 to 4 feet. Frank's Tract and similar flooded areas when mats are tight.
  Use a 2 to 2.5 oz punch weight, a punch skirt or creature bait on a 4/0 or 5/0 hook. Drive the bait straight down through the thickest part of the mat. Work it with vertical lifts, 2 to 3 feet at a time, then let it drop.
• Dragging a drop-shot along channel transitions — Midday when sun is bright, and anytime bass retreat to deeper structure. · Channel bends, slough entries, the transitions between 4 and 10 feet, especially in Frank's Tract and near Old River mouths.
  Keep your drop-shot weight in contact with the bottom. Drag slowly or soak vertically on the edge where shallow flats meet deeper channels. Feel for structure changes; rod tip sensitive, watch for bites.

Pro tips

• Tide is your biggest friend right now; match your retrieve speed and location to tide stage. On a falling or low tide, bass back off the shallow grass and bunch on the adjacent edge. On a rising tide, they push shallow and feed harder. Scout the tide calendar before you launch.
• When clarity swings from turbid to clearing, keep a vibrating jig and a finesse drop-shot in rotation. If your jig bite dies because the water clears, the drop-shot is your answer. If a murky pulse comes in, the jig with a darker color or a spinnerbait with a wider blade takes over.
• The solunar windows at 11:17 AM and 6:27 PM are real energy peaks; if your bite is slow between 10 and 12, push through. Same with the evening minor at 6:27 PM. Concentrate your effort during those 30 to 45 minute windows if the overall bite is sluggish. The morning major at 4:14 AM is rare to fish but produces if you're willing to be on the water in the dark.

If conditions change

If a front rolls through and pressure rises, water clears and light becomes bright and harsh, downsize immediately to a 4-inch green-pumpkin or PB&J finesse worm on a 1/8 oz drop-shot and fish the deepest channel transitions and submerged grass clumps at 10 to 15 feet. Bass will bury and get picky. Stay slow and methodical. If rain and wind muddied the water, swap to a black or junebug vibrating jig and a wide-blade spinnerbait in the same colors, and fish shallower since bass can't see far. Push into the grass and riprap more aggressively; the turbidity is now your advantage. If the wind shifts north and air temperature drops, the shallow bite will slow; move to that morning and evening window and focus on the transitions between shallow and deeper water, using finesse presentations during midday.