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Lewis & Clark (SD shore): Flat Gavins Point release — fall baitfish push
Monday Sep 21 – Thursday Sep 24, 2026 · Lewis and Clark Lake (SD–NE) · Gavins Point · bank, kayak & boat · Monday morning through Thursday evening focus · times CT
Near-matched inflow/outflow at Gavins Point. SD home-shore product — NE peer share, no duplicate full Cast.
Midweek outlook
**NWS** pin forecast for Lewis and Clark Lake (pulled Sun Sep 20 ~8:45–8:55 PM CT). Monday reads **Rain Showers** (~58°F); Thursday trends **Chance Showers And Thunderstorms** (~68°F). All clock times **CT**.
Barometer: KYKN baro blank at pull (not invented). Clarity unconfirmed — do not invent stain. SD home-shore pin; NE peer when live — one writer/share.
Mon–Thuthrough Thu evening CT
walleyelocalized — not bass-by-default
Weekday recreational soft Mon–Thu after residual weekend traffic Monday. No named trail event pulled for this window on this water — re-check local clubs before launch.
Monday
- High ~58°F / night ~50°F **CT** · 10 mph ENE · PoP ~93%
- Rain Showers
- Primary **walleye**: fish weather pauses and forage edges — not a bass-by-default week.
Tuesday
- High ~62°F / night ~51°F **CT** · 5 to 10 mph E · PoP ~2%
- Partly Sunny
- Primary **walleye**: fish weather pauses and forage edges — not a bass-by-default week.
Wednesday
- High ~66°F / night ~54°F **CT** · 10 to 15 mph SE · PoP ~22%
- Partly Sunny then Slight Chance Rain Showers
- Primary **walleye**: fish weather pauses and forage edges — not a bass-by-default week.
Thursday
- High ~68°F / night ~57°F **CT** · 10 to 15 mph SSE · PoP ~54%
- Chance Showers And Thunderstorms
- Primary **walleye**: fish weather pauses and forage edges — not a bass-by-default week.
Verify local CT sunrise/sunset at pin (~7:05–7:10 AM CT class Monday Pierre/Watertown corridor). All Cast times CT.
Generator / pool cheat sheet
Live **USACE Missouri River Basin Water Management** board pulled **2026-09-20 ~8:13 PM CT** (https://www.nwd-mr.usace.army.mil/rcc/reports/pdfs/MRBWM_Reservoir.pdf). Sunday elev/inflow/release only — **Mon–Thu hourly unit blocks not on this bulletin**; soft re-check language.
| Lake | Sun observed | Inflow / release | Notes |
|---|---|---|---|
| Gavins Point Dam (Lewis and Clark Lake) | Elev **1207.48 ft** (Δ +0.08) | In ~27,000 cfs · out ~27,000 cfs | MP ~100.0% · verify dam boards before you go |
USACE Missouri · Gavins Point Dam
Primary story: walleye. Secondaries: smallmouth bass, white bass, sauger.
Failover
Re-check USACE/USBR/NWS boards before launch — Sunday numbers age fast.
Schedules change without notice — re-check USACE / USBR / NWS before launch.
How to fish it — Bank / Kayak / Boat
Bank
- Dawn/dusk points and riprap with live bait or a slow jig — walleye first.
- Wind-blown banks after showers if safe.
- Watch slippery clay launches after Monday rain.
Kayak
- Parallel rock transitions and current seams (mainstem) or weed edges (glacial).
- Stake lightly — September walleye slide deeper midday.
- PFD on; midweek SW winds can stack chop on big water.
Boat
- Graph bait and follow birds/white-bass boils to find walleye underneath.
- Lead-core or snap-weights along breaks if wind allows.
- Idle zones near ramps if weekend leftovers linger Monday.
Lure box — Top / Mid / Bottom
Top
- Small buzz/walker only if bait is breaking — otherwise skip topwater.
- Long-bomb crank only on rare calm windows.
- Whites/SMB may crash bait — keep one reaction rod ready.
Mid
- Shad-profile cranks and swimbaits along windward breaks.
- Spinner harness + crawler where effective.
- Hair jig or soft plastic on rock for SMB bycatch.
Bottom
- Jig + minnow/plastic on points and river channel edges.
- Live-bait rig off the break as nights cool.
- Blade bait / hair jig when wind stands fish up.
Stain/clear: Clarity unconfirmed at pull — start natural/chrome and darken only if you see stain.
Life stage + What’s on the menu
**Late summer → early fall transition.** Cooler nights pulling **walleye** toward breaks and bait schools. Residual mild afternoons Wednesday–Thursday.
**What’s on the menu** (seasonal, not a dated hatch): YOY shad/minnows on mainstem; perch and invertebrates on glacial lakes. Match profile — do not invent a hatch date.
Ethanol-free fuel near this water
Pure-Gas.org E0 · near this water
Source: Pure-Gas.orgpulled Sun Sep 20, 2026 ~8:55 PM CT. Current prices — may change; verify at the pump.
- Shell Station, 3703 W 8th St, Yankton, SD — ~2.9 mi · E0 listing · Ethanol-free SHELL 87; GPS entered by galenprice not listed — verify at pump
- Riverside Pump N' Stuff, 3708 W 8th St, Yankton, SD — ~3.3 mi · E0 listing · Ethanol-free UNBRANDED 91; GPS located from addressprice not listed — verify at pump
- Trlple Time Rudy's, 1606 Broadway St, Yankton, SD — ~5.8 mi · E0 listing · Ethanol-free UNBRANDED 87 91; GPS located from addressprice not listed — verify at pump
- Yankton Sd, 2118 N Broadway, Yankton, SD — ~6.0 mi · E0 listing · Ethanol-free HY-VEE 87 91; GPS located from addressprice not listed — verify at pump
Also hot / also in season
- smallmouth bass — honest secondary this week
- white bass — honest secondary this week
- sauger — honest secondary this week
- Regs: SD GFP Fishinglive-check only — do not hardcode inches/creel.
Regs: live-check only — never hardcode length/creel in Cast text.