Reservoir · Mixed · Montana, US

Ennis Lake

Ennis Lake venue image

Ennis Lake is a shallow Madison-river reservoir, and shallow water cooks fast — by high summer it warms up to the point where it's a real welfare concern, not just a slow bite.

Fair · Rainbow
Balanced Leech · 8-12
Fairlive now
Reasonable autumn fishing likely at Ennis Lake
Useful ripple, fishable wave. Worth a session if the wind holds.
56% confidence

Ennis Lake is often best in spring through autumn.

What moved it
  • WindS 23 km/hModerate breeze
Today's fly
Balanced Leech
Balanced Leech8-12
Proven pattern for this period
Conditions on the water
Estimate
Wind
Moderate breeze
S 23 km/h
N
S
from the south
Wave40 cm chop
Water temp10.6°C
Air temp6°C
CloudBroken
Pressure1024 hPa
Rain · recent0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

How to fish it · for Rainbow
When
Conditions are not ideal but fishable at Ennis Lake.
Where
Start with Viva (10-12) on a figure-of-eight with occasional strip. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely. When no hatch is visible, a buzzer team — black stripped quill on the point, attractor or pearl-rib on the top dropper — is the default starting point on any UK stillwater.
The plan
Plan A

Start with Viva (10-12) on a figure-of-eight with occasional strip. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely. When no hatch is visible, a buzzer team — black stripped quill on the point, attractor or pearl-rib on the top dropper — is the default starting point on any UK stillwater.

Plan B

A fry-imitating pattern stripped through the margins can save a blank in autumn.

Watch for

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

Bank, sheltered shores

In wind, bank fish the lee shore — boats can anchor in productive areas if conditions allow.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Gray DrakeHatch
2
2
CallibaetisHatch
2
3
3
3
2
Hexagenia (Western)Hatch
2
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
Rainbow fly box
CH
Chironomid
12-16 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Montana stillwater regulations — check FWP
  • Shallow and temperature-sensitive.
What's coming
Plan ahead
5-day outlook
Condition match
60%
Cloud100%
Wind30%
Temp60%

A reasonable day here, though wind isn't quite in the sweet spot.

Fishing better nearby · 5
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Ennis Lake is a shallow Madison-river reservoir, and shallow water cooks fast — by high summer it warms up to the point where it's a real welfare concern, not just a slow bite. It holds browns and rainbows, and it fishes best in the cool shoulders of spring and fall when the water still has some life in it. Work the inflow channels with a leech or a chironomid in those windows, and when the lake gets warm in midsummer, do the fish a favor and go somewhere else.

  • Reservoir
  • Mixed
Water quality · US Clean Water Act
  • Aquatic life: Impaired
What this classification means

EPA ATTAINS assessment unit 'Ennis Lake' (MT41F005_030), 2021 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Habitat Alterations, Hydrologic Alteration, Metals Other Than Mercury. 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) · MT41F005_030

Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Cloud cover (cloud) suits the fishery well.
Directions
Seasons & zones
  • Trout Third Saturday of May → Last day of November
Related guides
Booking & contacts