Tailwater · Limestone · Montana, US

Beaverhead River

A fly fisher wading and casting on the Beaverhead River with pine-covered hills in the background, Montana.

The Beaverhead below Clark Canyon Dam is narrow, brushy, and choked with weed — and it grows browns and rainbows out of all proportion to its size.

Tomorrow · About as good as it gets
Czech Nymph
Forecast · Tomorrow
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% projected
Today's fly
Czech Nymph
Czech Nymph
Conditions on the water · Tomorrow
Live gauge
Level
Steady
0.31 m
Water temp11.5°C
ClarityClear
Weather16°C
WindN 12 km/h
Pressure1010 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Ideal
12°C est.ideal 1016°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Excellent — water temperature is right today, though time of day could be better.
Likely species
Hatch timeline · tomorrowPeak at 11am

12pm(now) Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 85%
Also:Black Midge49%Flying Ants31%
Peak emergence window9 food groups active

Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 with Pro.

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14-day free trial. Cancel anytime.

Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
Western Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Pale Morning DunHatch
2
3
3
2
TricoHatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Open all year
  • Flows track Clark Canyon releases; the river is narrow, brushy and often crowded.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. A fly fisher wading and casting on the Beaverhead River with pine-covered hills in the background, Montana.
    20180710-FS-Beaverhead-PJK-4622
  2. Terrain map of the venue
    Terrain map
About this water

The Beaverhead below Clark Canyon Dam is narrow, brushy, and choked with weed — and it grows browns and rainbows out of all proportion to its size. It's technical water in tight quarters, and it gets a crowd because everybody's heard about the fish. The flow is entirely release-controlled, so what comes out of the dam is the hand you're dealt for the day.

Under the surface

The Beaverhead is a tailwater that doesn't act like one — narrow, twisting and brush-choked, it comes out of Clark Canyon Reservoir and winds down through ranch country toward Dillon as a tight, willow-lined ditch of a river that happens to be stuffed with large, sullen brown trout. The cold, even release from the dam grows them big; the close banks and the snags make getting one out a different problem entirely. The water is clear and weed-rich, the bed gravel and silt, the current pushing hard against undercut corners where the good fish lie tight to cover. The character is intimate and a little claustrophobic — overhanging willows, blind bends, not much room for a backcast. Wading is awkward in the soft margins and brush, and much of the Beaverhead is fished, sensibly, from a boat.

Wading: Soft margins, snags and tight willow banks

  • Limestone
  • Partly confined
  • Pool riffle
Water quality · US Clean Water Act
  • Aquatic lifeImpaired
  • RecreationImpaired
What this classification means

Recreation: Bacteria/pathogen advisory — mind wading cuts and immersion.

EPA ATTAINS assessment unit 'Beaverhead River' (MT41B001_020), 2021 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Temperature, Sediment, Nutrients, Habitat Alterations, Hydrologic Alteration. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · MT41B001_020

The full read · show the working · for Brown Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 83
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout 1 January31 December
Related guides
Booking & contacts