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Missouri River Fly Fishing: Montana's Premier Tailwater for Trophy Trout

MT
intermediate

Quick Reference

WhatWhenKey Numbers
Dry fly fishingMay through October4,500-6,000 CFS ideal; PMDs, caddis, Tricos, BWOs
NymphingYear-round3,000-8,000 CFS fishable; midges, scuds, sow bugs
Streamer fishingMarch-April, October-NovemberBest on cloudy days; articulated patterns #2-6
Guided float tripsBook by February for peak season$600-750/day for 1-2 anglers, lunch included
Fly shopHeadhunters Fly ShopCraig, MT; largest shuttle service on the river
RegulationsHolter Dam to Cascade Bridge3 trout daily, only 1 over 18", only 1 brown trout
FISHABLE
Updated 2 days ago
Upper (Holter Dam to Craig)
Fishable
Flow3,200 CFS
Trendstable
Claritygin clear
Temp48-50°F
Pill Popper #16Black IPT #16-18Psycho May #16Tung Jig Pheasant Tail #16-18
Flows eased slightly to 3,200 CFS at Holter Dam—still well below average and the river remains gin clear, demanding stealth and precision. The cold front from earlier in the week has moved out and a warming trend is setting up with air temps forecast in the 60s-70s over the next 10 days, which should push water temps from 48-50°F upward and set the stage for early PMD activity by late May. Mother's Day Caddis remains the headline event—in full swing through the canyon from Craig downstream with peak emergence late afternoon into evening. Brown Caddis #12-14 the go-to dry pattern during the emergence window. BWOs still showing reliably on overcast afternoons, particularly in slicks and swirly water. March Browns finished. NOTE: Craig Bridge still closed for repairs; shuttles running daily but logistics require advance planning—contact Headhunters or Wolf Creek Angler for updated shuttle routes. Nymphing good but technical at these flows—sow bugs remain the bankable all-day pattern with Pill Poppers, Black IPTs, and Tung Jig Pheasant Tails all producing. Euro-style Perdigon rigs clearly outperforming indicator setups in the low, clear conditions. Dry fly opportunities daily but fish can be selective—slack-line presentations with cripples and emergers outperforming standard dun patterns. Long leaders (14+ feet), low profiles, and first-cast accuracy critical. Add slack at the fly end and execute shorter, repeated drifts rather than relying on a single long drift. Streamer fishing inconsistent—some days productive, others quiet—Sparkle Minnows and Kreelex with subtle twitches along banks when conditions allow.
Flow3,450 CFS
Trendstable
Clarityclear
Temp48-49°F
Sow Bug #14-16Zebra Midge #20-22Sawyer Pheasant Tail #18-24BWO Nymph #18-20
Flows steady around 3,450 CFS at Cascade with excellent wade fishing conditions—low water continues to open side channels that are normally too deep. Far less pressure than the upper section. The warming trend setting up this week (air temps 60s-70s) should nudge water temps from 48-49°F upward, moving fish back into shallower feeding lanes. BWOs still hatching consistently through the afternoon in canyon stretches, particularly under cloud cover. Caddis emergence well-established below Craig and still strengthening—late afternoon the prime window as air warms. Nymphing the most productive all-day approach with sow bugs, Sawyer Pheasant Tails #18-24, and Euro-style Perdigons in the softer seams. Chicago Overcoat Mint #10 remains an effective attractor nymph in this section. RS2 Emergers in olive and black (#18-22) producing well as a dropper. Streamer fishing hit-or-miss—swing Mini Dungeons, Thin Mints, and Trout Spey Buggers through deeper runs on productive days. Side channels still accessible at these low flows for walk-and-wade anglers looking to escape boat traffic. Wider spacing between boats recommended to give everyone room.
🎣 TACTICS RIGHT NOW
Dry Fly
Purple Haze #16-18Parachute Adams #16-20Elk Hair Caddis #14-16X-Caddis #16-18Corn-Fed Caddis #16Brown Caddis #12-14Jeb Caddis #14-16Olive Mayfly Cripple #16-18401K Baetis #18-20CDC BWO #18-20Griffith's Gnat #18-22; Mother's Day Caddis still in full swing—peak emergence late afternoon through evening in the canyon from Craig downstreamand this remains the best dry fly game on the river. Brown Caddis #12-14 the top-producing dry pattern during emergence windows. BWOs still showing on overcast afternoons in slicks and swirly water. March Browns finished for the season. Dry fly opportunities daily but fish can be truly selective—cripplesemergersand spinners consistently outperforming standard dun patterns. Slack-line presentations critical: add slack at the fly end and execute shorterrepeated drifts rather than relying on a single long drift. Long leaders (14+ feet) and 5X-6X tippet non-negotiable. Soft hackle swung on the drop still deadly during caddis emergence. Fish skittish at current flows—treat every first cast as your best chance and keep a low profile.
Nymph
Pill Popper #16Black IPT #16-18Psycho May #16Tung Jig Pheasant Tail #16-18Blow Torch #16Juju Baetis #18-22Zebra Midge #20-22TB UV Sow Bug Rainbow #16Hot Bead Sow Bug #14-16Perdigon Olive #18RS2 Emerger #18-22Sawyer Pheasant Tail #18-24Wondernymph Black #18-22Chicago Overcoat Mint #10; smaller double nymph rigs the go-to right now—sow bug trailing a caddis emerger the most consistent producer. Sow bugs remain the bankable all-day pattern in sizes #14-16 fished deep in slower water targeting pods. Euro-style Perdigon rigs clearly outperforming indicator setups in the lowclear conditions—olive and brown particularly effective. Caddis pupae very active subsurface—caddis emerger droppers producing well from Craig downstream. Nymphing good but not lights-out; the fish are there but require precise presentations. Dry-dropper effective in shallower runs with a visible dry and sow bug or Pheasant Tail below. Scum lines and shallow flats holding feeding fish—keep subsurface presentations simple and precise.
Streamer
Sparkle Minnow #6Thin Mint #4-6Trout Spey Bugger #6Mini Dungeon #4-6Kreelex Copper/Gold #6Crawfish Pattern #6-8Chicago Overcoat Mint #10; streamer and swing fishing inconsistent right now—some days productiveothers quiet—while dry fly and nymph action dominate the scorecard. Worth trying on cloudy days and low-light windows (early morninglast hour) but don't build your day around it. Sparkle Minnows and Kreelex with subtle twitches along banks and structure the best bets when conditions cooperate. Swinging crawfish patterns and Trout Spey Buggers still productive for quality browns in the lower section. Two-handed rods in 3-5 weight range with Skagit heads effective for covering water in the lower canyon stretches.
Best fishing 11am-6pm as water temps sit at 48-50°F. A warming trend is setting up with air temps forecast in the 60s-70s over the next 10 days—expect mornings to improve as water temps climb, potentially pushing into the low 50s by late week. Nymphing with sow bugs the bankable all-day technique, especially effective when sun is directly on the water. BWO dry fly window noon-2pm under clouds—afternoon cloud cover still your best friend for surface action. Mother's Day Caddis 3pm-dark in full swing, strongest in the canyon stretches below Craig and still the primary dry fly event. Late risers are getting the best of the caddis hatch right now. Fish are skittish at low flows; minimize wading noise, keep your profile low, and treat every first cast as your best chance.
FORECASTThe Missouri continues to fish well at 3,200 CFS—low, clear, and technical but rewarding for anglers who bring stealth and precision. A significant warming trend is setting up with air temps forecast in the 60s-70s over the next 10 days, which should push water temps from 48-50°F into the low 50s and trigger increased insect activity across the board. Mother's Day Caddis remains the dominant hatch through the canyon and will carry through late May. PMD hatches should begin appearing by late May/early June as water temps push higher—the warming forecast accelerates that timeline. Flows remain below average with below-average snowpack—the river is unlikely to see the typical late-May/June flow bump, which is excellent news for wade anglers and dry fly enthusiasts. LOGISTICS NOTE: Craig Bridge still closed for repairs—shuttle services operating on alternate routes, plan accordingly and contact fly shops in advance. Post-spawn rainbows feeding aggressively with fish condition excellent. The caddis emergence combined with reliable BWOs and an approaching PMD overlap make late May one of the best windows of the spring. Wider spacing between boats recommended to give all anglers room. Book guided trips now for the late May/early June PMD transition.

Why the Missouri

The Missouri River below Holter Dam is one of the most productive trout fisheries in the Lower 48. The 35-mile tailwater section from Holter Dam to Cascade, located between Helena and Great Falls along Interstate 15, consistently holds 3,000+ trout per mile in the upper sections. These are wild fish (no hatchery stocking), with rainbows averaging 14-20 inches and browns regularly exceeding 16-22 inches.

What makes this river special is consistency. While other Montana rivers blow out during spring runoff, the dam-controlled flows on the Missouri keep it clear and fishable nearly year-round. The nutrient-rich tailwater produces dense insect hatches from March through November, making it what many anglers call "the world's largest spring creek."

The fishing community around Craig, Montana (population: roughly 40) exists almost entirely because of this fishery. Multiple fly shops, guide services, and lodges cluster along this tiny stretch of Interstate 15 to serve anglers who travel from across the country.

River Sections

The tailwater divides into three distinct sections, each with its own character.

Upper Section: Holter Dam to Craig (7.8 miles)

This is where the fish are densest. Montana FWP electrofishing surveys in the Craig section have recorded 2,680 rainbow and 680 brown trout per mile (fish over 10 inches), though numbers fluctuate year to year. The long-term average sits around 3,400 rainbows and 570 browns per mile.

The upper section is broad (roughly 100 yards wide) with long, slow-moving runs, mellow riffles, and gravel islands. Bright green weed beds dot the bottom, and the water has a teal-blue tint typical of tailwaters. This stretch gets the heaviest pressure but also holds the most fish.

Key access points:

  • Holter Dam (mile 0)
  • Wolf Creek Bridge (mile 2.3)
  • Craig (mile 7.8)

Canyon Section: Craig to Tower Rock (14 miles)

The river narrows and picks up character through the canyon. Limestone cliffs rise sharply on both sides, creating dramatic scenery and defined water. This section has sharper banks, mid-river boulders, and more distinct drop-offs compared to the broad upper stretch.

The Dearborn River enters from the west side, adding volume and insect diversity. Yellow Sally stoneflies appear in the canyon sections from June through July, something you won't find in the flatter upper water.

Key access points:

  • Stickney Creek (mile 11.5)
  • Dearborn (mile 13.7)
  • Mid Cannon (mile 15.2)
  • Mountain Palace (mile 21.2)
Holter Dam controls flows on the entire tailwater, keeping the Missouri fishable when other Montana rivers blow out

Holter Dam controls flows on the entire tailwater, keeping the Missouri fishable when other Montana rivers blow out

Lower Section: Tower Rock to Cascade (13 miles)

Below Tower Rock the river broadens onto the Great Plains. The water slows considerably, with many wadeable channels and islands. This section holds fewer fish per mile (roughly 1,100 rainbows and 238 browns over 10 inches, per FWP surveys), but the fish can be larger and you'll see far fewer anglers.

Half Breed Rapids, the only notable rapid on the entire tailwater (Class II at most), sits about 10 miles upstream from Cascade. Otherwise the lower section is flat, slow, and perfect for sight-fishing to cruising trout.

Key access points:

  • Prewett Creek (mile 22.4)
  • Pelican Point (mile 25.9)
  • Cascade (mile 35.0)

Flow Windows

Dam releases from Holter Dam control the entire fishery. Understanding flow ranges is critical for planning your trip.

CFS RangeConditionsBest For
Below 3,500Low flows; shallow side channels; excellent wadingWalk-and-wade anglers; sight fishing
3,500-5,000Good flows; all sections accessibleDry fly fishing; general float trips
4,500-6,000Ideal range; side channels openPeak dry fly; perfect floating conditions
6,000-8,000Higher water; stronger currentNymphing; streamer fishing from drift boats
Above 8,000High water; challenging anchoringExperienced rowers only; strong streamer fishing

Track current Missouri River flows on RiverReports before making the drive. Flow changes from the dam can take 4-6 hours to reach Cascade, so the upper and lower sections may fish differently on the same day.

The Missouri winds through rolling Montana hills between Craig and Cascade

The Missouri winds through rolling Montana hills between Craig and Cascade

Hatches and Fly Patterns

The Missouri's hatch calendar is one of the most diverse and predictable of any Western tailwater. Here's what to expect month by month, based on reports from Headhunters Fly Shop, Living Water Guide Service, and local guides.

March-April: Early Season

Spring starts slow with midges and scuds, then builds. By late March, Blue-Winged Olives (BWOs) begin appearing on overcast days, and Skwala stonefly nymphs become active along the banks.

Key flies:

  • Zebra Midge #18-22 (black, red, olive)
  • Pink Scud #14-16
  • Sow Bug #14-16
  • BWO Parachute #16-20
  • Pat's Rubber Legs #8-10 (Skwala nymph)

Tip: Nymphing dominates early season. Fish deep with two-fly rigs targeting the bottom 6-12 inches. On warmer overcast afternoons, watch for BWO activity in slower water.

May: The Season Ignites

May is when the Missouri transforms. March Browns and the famous "Mother's Day Caddis" hatch overlap with continued BWOs, creating multi-course surface feeding. This is many anglers' favorite month.

Key flies:

  • Elk Hair Caddis #14-16
  • X-Caddis #14-18
  • March Brown Comparadun #12-14
  • BWO Cripple #16-20
  • Griffith's Gnat #18-22

Tip: Fish a caddis dry with an emerger dropper. The emerger pattern often outperforms the adult, as trout target struggling insects just below the surface.

A well-stocked fly box for the Missouri should cover midges, BWOs, caddis, PMDs, and Tricos

A well-stocked fly box for the Missouri should cover midges, BWOs, caddis, PMDs, and Tricos

June: PMDs and Peak Caddis

Pale Morning Duns (PMDs) start appearing by mid-June, overlapping with the tail end of the caddis hatch. This creates exceptional dry fly fishing, though June is also the busiest month on the river.

Key flies:

  • PMD Comparadun #14-18
  • PMD Cripple #16
  • Rusty Spinner #16
  • CDC Caddis #14-18
  • Yellow Sally Nymph #12-16 (canyon sections)

Tip: PMD cripples and spinners consistently outperform standard dun patterns. Trout target the vulnerable, struggling insects rather than healthy adults sitting on top of the water.

July-August: Tricos and Terrestrials

Late July brings the Trico hatch, one of the Missouri's signature events. Tiny mayflies (#18-22) blanket the water at dawn, creating dense spinner falls that bring up every fish in the river. By midday, terrestrials (hoppers, ants, beetles) take over.

Key flies:

  • Trico Spinner #18-22
  • Hi-Vis Trico #20
  • Morrish Hopper #8-12
  • Chubby Chernobyl #8-10
  • Parachute Ant #14-18

Tip: Trico fishing demands precision: 12-14 foot leaders tapered to 5X-6X, drag-free drifts, and downstream presentations. The fish feed in pods, and you need to target individuals rather than blind casting. After 10am when the Trico fall ends, switch to hoppers and banks.

September-October: Fall Revival

Cooling temperatures trigger a second BWO emergence and the arrival of October Caddis (#8-10). Streamer fishing becomes increasingly productive as brown trout turn aggressive ahead of their November spawn.

Key flies:

  • BWO Parachute #18-22
  • October Caddis Dry #8-10
  • Stimulator (orange) #8-10
  • Woolly Bugger #4-8
  • Articulated streamer patterns #2-6

Tip: Fall on the Missouri is arguably the best overall fishing of the year. Fewer anglers, aggressive fish, and overlapping hatches make September and October prime months for planning a trip.

A woolly bugger, one of the most versatile streamer patterns for Missouri River browns in fall

A woolly bugger, one of the most versatile streamer patterns for Missouri River browns in fall

November-February: Winter Fishing

The Missouri fishes well even in winter, thanks to dam-controlled water temperatures that stay warmer than the ambient air. Deep nymphing with midges, sow bugs, and scuds is the primary approach. On warmer days, streamer fishing produces some of the largest fish of the year.

Key flies:

  • Zebra Midge #18-22
  • Rainbow Warrior #16-18
  • Sow Bug #14-16
  • Pink Scud #14-16
  • Articulated streamers (leech patterns, crawdad imitations)

Tip: The best winter fishing window is typically 11am to 3pm when water temps peak. The Missouri has earned a reputation as "the Trout Spey center of the West" for its excellent winter swing fishing using Skagit and Scandi lines.

Fishing Techniques

Nymphing

The most productive year-round technique on the Missouri. Simple right-angle indicator rigs work well, with depth management being the critical factor. Use 4X-5X fluorocarbon tippet and adjust your indicator frequently to keep flies in the bottom third of the water column.

Standard two-fly setups work best: a larger attractor nymph (like a Pat's Rubber Legs or Girdle Bug) on the point, with a smaller midge or emerger pattern trailing 12-18 inches behind.

Dry Fly

This is what makes the Missouri famous. When hatches are on, the river becomes a dry fly paradise with pods of rising fish scattered across every run. Success requires:

  • Long leaders (12-14 feet minimum, tapered to 5X-6X)
  • Downstream presentations for finicky fish
  • Accurate casts to individual rising fish rather than blind coverage
  • Pattern matching, particularly during PMD and Trico hatches

Streamer Fishing

The Missouri's streamer game focuses on smaller patterns (size 2-6) imitating sculpins, crawdads, and juvenile trout. Spring and fall are peak seasons, with cloudy days and rising water producing the best action. Sink-tip lines help get patterns down in the deeper runs.

Spey and Swing Fishing

The Missouri has become one of the premier Trout Spey destinations in North America. Two-handed rods in the 3-5 weight range allow anglers to fish soft hackles (#16), small streamers, and articulated patterns through the long runs effectively. November is peak Spey season.

Fish Population Data

Montana FWP conducts electrofishing surveys on the Missouri regularly, providing some of the best long-term population data of any Western river.

SectionRainbow Trout/MileBrown Trout/MileStatus
Craig~2,680~680Below long-term avg of 3,400 / 570
Cascade~1,100~238Below long-term avg of 1,600 / 390

Population estimates for fish over 10 inches. Numbers fluctuate year to year based on runoff conditions, spawning success, and other factors.

Despite recent survey dips, the Missouri still holds trout in the thousands per mile, far exceeding most Western rivers. FWP health assessments found that of nearly 8,000 adult trout captured in recent fall surveys, only three showed signs of infection, indicating excellent overall fish health.

Species you'll encounter:

  • Rainbow trout (primary): Average 14-20 inches; seldom exceed 22 inches
  • Brown trout: Average 16-22 inches; fish over 20 inches not uncommon
  • Mountain whitefish: Larger than typical Montana rivers; often caught nymphing
  • Incidental species: Walleye, northern pike, burbot, carp

Access and Logistics

Getting There

The Missouri River tailwater sits between Helena and Great Falls in central Montana, running parallel to Interstate 15. Craig, the hub of the fishing community, is roughly:

  • 35 miles north of Helena
  • 55 miles south of Great Falls
  • 200 miles northwest of Bozeman
  • 115 miles southeast of Missoula
The Helena valley, about 35 miles south of Craig, with the Big Belt Mountains in the distance

The Helena valley, about 35 miles south of Craig, with the Big Belt Mountains in the distance

Float Distances and Times

Most anglers fish from drift boats, which is the most effective way to cover water. Common float sections:

FloatDistanceApproximate Time
Holter Dam to Craig7.8 miles4-5 hours fishing
Craig to Stickney Creek3.7 miles2-3 hours fishing
Craig to Mid Cannon7.4 miles5-6 hours fishing
Craig to Mountain Palace13.4 milesFull day
Mountain Palace to Cascade13.8 milesFull day

Shuttle services are available through Headhunters Fly Shop and other Craig-based operations. Arrange shuttles ahead of time, particularly during peak summer months.

Wading Access

Walk-and-wade anglers can access productive water from several points. The best wading opportunities are at low to moderate flows (below 4,500 CFS). Wade the upper section near Holter Dam and Craig for the highest fish density, or try the lower section near Cascade for fewer crowds and wadeable side channels.

Wading safety: The Missouri's bottom is a mix of gravel and silt with occasional deep drop-offs. Use a wading staff and felt-soled or studded boots. Do not attempt to wade across the main channel at any flow level.

Boat Types

  • Drift boats: The standard for guided and self-guided float trips
  • Rafts: Work well, particularly for camping float trips
  • Pontoon boats and inflatable kayaks: Good for solo anglers
  • Float tubes: Not recommended anywhere on the Missouri due to wind and current

Lodging and Services

Craig and Wolf Creek offer the closest lodging. Options range from basic cabins to full-service fly fishing lodges:

  • Craig area: Cabins, vacation rentals, and riverside lodges. Missouri River Lodge in Wolf Creek offers all-inclusive packages.
  • Helena: Full hotel and restaurant options, 35 minutes south
  • Great Falls: More options, 55 minutes north

Fly shops in Craig carry everything you need and provide current fishing reports. Wolf Creek Angler and Headhunters are the two primary shops, both offering guided trips, drift boat rentals, shuttle services, and daily fishing reports.

Guided Trips

For first-time visitors, a guided float trip is the most efficient way to learn the river. Multiple outfitters operate on the Missouri, including:

What to Expect

DetailTypical Range
Full-day float (1-2 anglers)$600-750
Half-day float (1-2 anglers)$500-550
Trip duration8-10 hours (full day)
What's includedRods, reels, flies, lunch, beverages
Gratuity$150-200+ per guide
Booking lead timeFebruary-March for peak summer dates

Yellow Dog Flyfishing Adventures books premium lodge-and-guide packages on the Missouri for anglers who want an all-inclusive experience. Premium lodges include the Lodge at Eagle Rock and Missouri River Ranch.

A Missouri River trout held streamside before release. Rainbows average 14-20 inches, with browns often exceeding 16.

A Missouri River trout held streamside before release. Rainbows average 14-20 inches, with browns often exceeding 16.

The Land of Giants

One section worth special mention: the roughly 20-minute stretch below Hauser Dam, upstream of Holter Reservoir. Known as the "Land of Giants" or L.O.G., this short reach holds predominantly rainbow trout averaging 18-22 inches, with fish exceeding 24 inches not unusual.

Access requires a jet boat from Montana Trout on the Fly or similar outfitters. The L.O.G. fishes best in April-May and mid-October through November. This is not the main tailwater section, but it's worth knowing about if you're chasing trophy fish.

Floating and Paddling

The Missouri tailwater is popular with non-fishing floaters too. The 35-mile stretch from Holter Dam to Cascade is gentle water, suitable for drift boats, rafts, canoes, and inflatable kayaks. There are no significant rapids other than Half Breed Rapids (Class II) in the lower section near Cascade.

For extended paddling trips beyond the tailwater, Missouri River Outfitters in Fort Benton has operated since 1965, offering multi-day canoe trips through the White Cliffs section and Upper Missouri River Breaks National Monument. These trips cover 14-20 miles per day on gentle, flat water with no rapids.

Float etiquette: Respect wade anglers by floating on the opposite side of the river. Avoid anchoring in productive seams; use eddies instead. Keep noise down when passing through fishing water.

Regulations

The Missouri River from Holter Dam to Cascade Bridge falls under Montana's Central Fishing District regulations:

  • Combined trout limit: 3 daily and in possession
  • Size restriction: Only 1 trout over 18 inches
  • Brown trout: Only 1 brown trout per day may be kept
  • Season: Open year-round
  • Methods: Artificial flies and lures (no bait in this section)

License Requirements

All anglers 12 and older need:

  1. Montana Conservation License
  2. Aquatic Invasive Species (AIS) Prevention Pass
  3. Base Fishing License

Nonresident costs (2026): Season license $117.50; 5-day license $73.50. Purchase online through the Montana FWP licensing system before your trip.

Hazards and Safety

The Missouri is a big, powerful river. Take these seriously:

  • Wind: Central Montana is notoriously windy. Gusts can make rowing difficult and create dangerous whitecaps on the broader sections. Check forecasts before launching.
  • Cold water: Tailwater temperatures stay in the 40s-50s even in summer. Hypothermia is a real risk for anyone who ends up in the water. Wear a PFD when floating.
  • Wading depth: The Missouri's gravel bottom drops off sharply in places. As you wade deeper, buoyancy reduces your effective weight. Stay conservative.
  • Boat traffic: Peak summer weekends see heavy drift boat traffic, particularly between Holter Dam and Craig. Stay aware of other boats, especially at popular access points.
  • Strainers and debris: Fallen trees and submerged logs appear throughout the river. Give them wide clearance.

Seasons at a Glance

SeasonWhat to ExpectCrowd Level
March-AprilNymphing, early BWOs, Skwalas; water temps climbingLow
MayCaddis hatch, March Browns, first strong dry fly; variable conditionsModerate
JunePMDs, peak caddis, excellent dry fly; busiest monthHigh
July-AugustTricos at dawn, hoppers midday, evening caddis; technical fishingHigh
SeptemberBWOs return, streamer fishing improves; outstanding overallModerate
OctoberOctober Caddis, fall BWOs, aggressive pre-spawn brownsModerate-Low
November-FebruaryWinter nymphing, Trout Spey, midges; cold but productiveLow

Using RiverReports

Track real-time Missouri River flows on RiverReports. The two key gauges to watch are:

  • Missouri River below Holter Dam (near Wolf Creek): Shows what the upper tailwater section is doing right now
  • Missouri River at Cascade: Shows conditions in the lower section

Compare current readings against the flow windows table above to assess conditions before your trip. Flows between 4,500 and 6,000 CFS generally produce the best dry fly fishing, while higher flows favor nymphing and streamer techniques.

During peak season (June-August), check flows daily. Dam releases can change quickly, and a 2,000 CFS swing in a single day is not unusual. What fishes well in the morning may be a different river by afternoon.

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