Missouri River cats stay active as Black Hills trout bite holds

What's biting

What's next

Over the next two to three days, expect flows on the Missouri River system to hold steady to slightly lower given typical early-September patterns, though the zero reading at USGS gauge 06440200 is more likely an instrument or reporting gap than an actual no-flow condition — call ahead or check a secondary gauge before committing to a put-in. Water temperatures across the river corridor should continue their gradual seasonal slide as nights cool, which typically pushes catfish into more predictable evening and overnight feeding windows — good news for anglers planning to run trotlines the way Wired 2 Fish's River Rat feature describes on the Missouri River generally.

If current trends hold, walleye should start showing more consistent shallow-water activity on the reservoir stretches as baitfish schools push toward points and flats ahead of the fall turnover — a pattern typical for mid-September in this fishery, though we don't yet have a fresh local report confirming it's underway. Anglers targeting largemouth and smallmouth bass in Missouri River backwaters should key on baitfish location rather than structure alone; On The Water's recent fall-bass piece makes the same case nationally, and the logic applies just as well here — find the shad and shiners, and the bass won't be far behind.

In the Black Hills, freestone streams should be running clear and cool, which is typically the recipe for a strong September-into-October trout bite on dry flies during midday hatches and streamers in low light. There's no fresh Black Hills-specific report in this week's intel, so treat that as a seasonal expectation rather than a confirmed bite.

This week's new moon phase is worth planning around — expect stronger low-light feeding windows at dawn and dusk across every species listed here, with a modest overnight bite window for catfish in particular. Weekend anglers should prioritize early-morning and late-evening trips over midday outings. If the gauge reading at 06440200 corrects to a normal flow value in the coming days, that's the signal current-dependent presentations (drifted bait, current-seam jigging) can go back into rotation; until then, fish it as a low-flow system and adjust bait weight and cast placement accordingly.

Context

September on South Dakota's Missouri River is traditionally catfish season shifting into its late peak — blue and channel cats typically stay aggressive as water cools from summer highs, and the trotline approach described in this week's Wired 2 Fish feature on the Missouri River reflects a technique anglers have leaned on across this system for generations, not a new development. Walleye anglers typically see the reservoir bite strengthen through September and into October as fish stage for the fall feed before ice-up, a pattern still ahead of us if the season runs typical to average.

In the Black Hills, September and October are considered prime trout months precisely because summer crowds thin and stream temperatures drop into the ideal range for both dry-fly and streamer presentations — on schedule for a normal Black Hills fall, not early or late by any signal in this week's data.

We don't have a comparative reading to say whether this year is running ahead of or behind a typical September — the only hard data point this week is a USGS gauge showing effectively zero flow, which is unusual enough that it likely reflects a reporting gap rather than a genuine trend, and none of this week's angler intel offers a South Dakota-specific report to compare against prior years. Treat this report as a seasonal-pattern guide rather than a confirmed on-the-water update until fresher local reports come in.