Quick reference
| Field | Value |
|---|---|
| State / region | North Dakota, central-western part of the state below Garrison Dam near Riverdale |
| Species | Rainbow trout, brown trout, walleye, northern pike, smallmouth bass, plus seasonal salmon |
| Best months | March–June and September–November |
| Water type | Tailwater — cold, regulated releases from Lake Sakakawea |
| Difficulty | Intermediate — big, powerful water where reading seams and getting flies deep matter more than delicate presentation |
| Wading | Limited. Riprapped, uneven rock and strong current keep most anglers on the bank or in boats; select bars and inside bends wade at moderate flows |
Why fish here
The Garrison Dam Tailrace is the exception to almost everything else in North Dakota. Deep releases from Lake Sakakawea keep this reach of the Missouri cold and open year-round, supporting trout in a state otherwise dominated by warm, silty prairie rivers. North Dakota Game and Fish specifically lists the tailrace as a consistent producer of trophy brown and rainbow trout, sharing the water with strong numbers of walleye and seasonal salmon — one of the more unusual multi-species tailwaters in the Upper Midwest.
For a fly angler, that combination means a legitimate shot at large trout in a river environment, plus walleye and other predators that eat the same streamers and nymphs. The fishery stays fishable when the region's freestone streams are muddy or iced over, and the developed access below the dam — paved road, parking, camping, and facilities managed by the U.S. Army Corps of Engineers — makes it an easy destination for a traveling angler rather than an expedition.
The honest framing: this is not a match-the-hatch trout stream. It is a big, powerful river where subsurface tactics dominate, mixed catches are the norm, and the reward for learning the water is fish that outclass anything else in the state.
The river, section by section
Immediate Tailrace Pool (base of Garrison Dam)
Access: Garrison Dam Tailrace area off ND-200 west of Washburn — paved access road, parking, fish cleaning station, developed camping, security lights, all managed by the U.S. Army Corps of Engineers Character: Broad, powerful tailwater pool with strong regulated current and deep, turbine-influenced structure; shoreline armored with fist- to head-size rock Species mix: Rainbow and brown trout (with documented trophy-class fish), abundant walleye, seasonal salmon, and occasional other cool-water species Crowding: The focal access — busy on spring and fall weekends, especially with walleye anglers; weekdays lighter, winter lighter still Notable hatches: Limited insect documentation, but nymphing is specifically recommended here — expect midges, mayflies, and caddis in generic tailwater form, with streamers productive whenever flows and clarity cooperate
This pool is where the cold water, the food, and the fish concentrate, and it is the natural starting point for a first visit. The armored shoreline creates complex seams and drop-offs within casting range of the bank, but the same rock makes footing uneven — wading is possible from shore at lower flows, though most anglers fish from the bank or a boat because of depth and slick rock.
Expect company. The tailrace is as much a walleye destination as a trout fishery, and a hot bite draws steady pressure through the shoulder seasons. Winter thins the crowd to a core group of locals working the open water.
Downstream Bank and Shoreline Drifts (Tailrace Landing reach)
Access: Tailrace Landing, just south of Garrison Dam, plus additional shoreline parking and walk-in spots along the same paved road system Character: Wide channel with strong but more uniform current, transitioning from deep pool into long runs and mid-river seams; rocky, riprapped banks giving way to flatter gravel bars and softer banks downstream Species mix: Rainbows and browns move through, but walleye dominate many drifts; salmon seasonally, plus goldeye and catfish Crowding: Boat and shore traffic climbs when the walleye bite is on — typically mid-to-late May through the open-water season, heaviest on weekends Notable hatches: Subsurface food rules — standard river nymphs (mayfly, caddis, midge) in the warm months, with baitfish and smelt-style streamers the key forage imitation most of the year
This reach rewards anglers who think like streamer fishermen. The gear crowd fishes three-way rigs and stickbaits near bottom for walleye through here, which tells you where the fish sit: deep, on the seams, close to the bottom. Density-compensated lines and weighted flies that get down fast are the fly-rod equivalent.
Wading opens up somewhat on select bars and inside bends at moderate flows, but the drop-offs are deep and the hydraulics strong — treat this as bank-and-boat water with occasional wading, not a wade fishery.
Lower Tailrace to Stanton and Washburn (drift reach)
Access: Drift boat put-in at the Garrison Dam Tailrace (river mile 1390), with downstream access at Stanton (RM 1370) and Washburn (RM 1355) Character: Large, braided prairie-river tailwater — broad runs, sweeping bends, and mid-channel bar systems at big-river scale; low gradient, primarily boat water Species mix: Trout are still possible but fade as dam influence softens; walleye, sauger, goldeye, catfish, and other Missouri River species become the mainstays Crowding: Moderate and mostly boat-based, tracking the broader walleye seasons; spring and fall weekends see the most use, with summer traffic spread across many miles Notable hatches: Skip the hatch-matching — baitfish streamers and attractor nymphs fished deep through current seams are the productive program
This is float water. Riffle-run-pool structure exists, but scaled to a river that is measured in river miles rather than pools, and wading is limited to inside bends and shallow bars at lower flows. The Stanton and Washburn accesses are standard river sites used by paddlers and anglers, and they turn the tailrace into a legitimate multi-mile float fishery for anglers with a boat.
The trade-off is species mix: the farther from the dam, the less this fishes like trout water. Come down here for mixed-bag streamer fishing and solitude, not for a numbers day on rainbows.
Hatches and seasons
| Months | Hatches | Flies |
|---|---|---|
| Mar–Apr | Cold-season midges and early mayfly nymphs; forage dominated by subsurface insects and baitfish in cold flows | Zebra Midge #18–20, Pheasant Tail Nymph #14–18, Hare's Ear Nymph #14–16, Woolly Bugger #6–10, smelt/minnow streamers (Clouser Minnow) #4–8 |
| May–Jun | General mayfly and caddis activity builds with warming water; the tailrace walleye bite typically starts mid-to-late May | Prince Nymph #12–16, Hare's Ear Nymph #12–16, soft-hackle wets #14–16, baitfish streamers in white/silver/olive including Woolly Bugger #4–8 |
| Jul–Sep | Mixed summer midges, mayflies, and caddis, with most feeding subsurface | Weighted nymphs (Pheasant Tail, Hare's Ear, caddis pupae) #12–18, larger streamers and articulated patterns #4–8, smelt/minnow imitations on density-compensated lines |
| Oct–Dec | Insects taper off; nymphs and streamers carry the fishing, with the walleye bite often running into December | Heavy nymphs (#16–18 midges, #12–16 mayfly/caddis), baitfish streamers #4–8 in white, silver, olive, and black; larger patterns for trophy trout on sinking lines |
Recommended flies (by season)
| Season | Top patterns | Why |
|---|---|---|
| Spring | Zebra Midge, Pheasant Tail Nymph, Hare's Ear Nymph, Prince Nymph, Woolly Bugger, smelt/minnow streamers | Cold flows and rising temperatures concentrate fish on subsurface insects and baitfish; nymphing is the recommended tactic and streamers appeal to trout and walleye alike |
| Summer | Weighted mayfly and caddis nymphs #12–18, soft-hackle wets, medium streamers in white, silver, olive, black | More insect activity but still strong current — fish feed below the surface, and the nymph-or-streamer choice covers both the insect base and the baitfish forage |
| Fall | Larger Woolly Buggers and articulated streamers, heavier nymphs, smelt-style baitfish patterns fished deep | Cooling water and migrating baitfish push trout and walleye to bulk up; big streamers and deep nymph rigs target the trophy browns and rainbows the tailrace is known for |
| Winter | Small midges and compact streamers, fished slow and deep on sink-tips | Open water persists below the dam while metabolism drops; fish hold near bottom in the most stable current and favor small, easy meals |
Gear notes
Bring more rod than a typical trout trip: a 9-foot 6- or 7-weight handles the current, the wind, and the mixed-species reality of trophy trout and walleye in the same runs. A weight-forward floating line covers nymphing and bank work; add a density-compensated or sinking line for streamers in strong, deep current. Leaders run 9–12 feet in the 10–15 lb range with 3X–4X tippet for trout and walleye — go heavier, with shock tippet, if pike are a target. Sturdy wading boots with ankle support, stockingfoot waders, polarized glasses, and a brimmed hat matter here; the banks are rocky, uneven, and exposed to serious prairie weather.
Logistics
- Regulations: North Dakota Game and Fish Department statewide regulations apply; the department lists the tailrace as a special trophy-producing trout and multi-species fishery. A valid North Dakota fishing license is required, and bag limits, size restrictions, and any special trout rules should be confirmed in the current regulations — they change annually. The U.S. Army Corps of Engineers manages the dam, campground, and developed access on the ground.
- Access points:
- Garrison Dam Tailrace — 47.5025, -101.4326 — primary access directly below the dam, with paved road, parking, fish cleaning facility, developed camping, and boat put-in/take-out
- Tailrace Landing — shoreline and boat access just south of Garrison Dam
- Stanton Access — downstream access around river mile 1370, used as a put-in or take-out for floats
- Washburn Access — river mile 1355, a lower take-out for longer floats starting at the tailrace
- Nearest towns: Riverdale, Pick City, Washburn, Stanton, Bismarck
- Closest gauge: USGS 06342500 — Missouri River at Bismarck, ND — the only active mainstem gauge in North Dakota, about 56 river miles below the tailrace, so it tracks Garrison releases with a lag. Check the Corps' Garrison Dam release schedule before a trip; high releases sharply limit bank and wading options
When NOT to fish here
Dam regulation insulates the tailrace from classic snowmelt runoff, but high-water releases create dangerously strong current, eliminate most wading, and make bank fishing difficult — check flows and release schedules before driving out. Bitter cold snaps with high wind can make winter fishing hazardous even though the water stays open. Peak walleye weekends (mid-to-late spring, and again during good fall bites) bring heavy crowding that can crowd out a fly angler's water. And if the river below the tailrace turns heavily off-color from upstream events or local storms, fine presentations stop producing until clarity returns.
Where to fish next
- Fly Fishing in North Dakota — the full state guide
- Missouri River, Washburn to Bismarck reach — the continuation of the drift fishery downstream, with walleye and mixed warm-water species
- Heart River — a smaller Missouri tributary option in the same region