Mountain Lake · Mixed · Montana, US

Hyalite Reservoir

Hyalite Reservoir with mountain reflections near Bozeman, Montana

Hyalite is a high mountain reservoir up the canyon south of Bozeman, ringed by peaks and ice-locked half the year, holding cutthroat, Arctic grayling, and brook trout in cold, clear water.

Fair · Cutthroat Trout
Balanced Leech · 8-12
Fairlive now
Reasonable autumn fishing likely at Hyalite Reservoir
Good wave on — drift country. A useful wave. Work the productive shore.
56% confidence

Hyalite Reservoir is often best in spring through autumn.

What moved it
  • WindS 10 km/hLight breeze
Today's fly
Balanced Leech
Balanced Leech8-12
Proven pattern for this period
Conditions on the water
Estimate
Wind
Light breeze
S 10 km/h
N
S
from the south
Wave20 cm ripple
Water temp11.4°C
Air temp12°C
CloudBroken
Pressure1012 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 Cutthroat Trout
When
The short high-country summer, June through September
Where
Start with Balanced Leech (8-12) on a As per local method. If that does not produce, switch depth or speed before changing the pattern entirely.
The plan
Plan A

Start with Balanced Leech (8-12) on a As per local method. If that does not produce, switch depth or speed before changing the pattern entirely.

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.

Either bank or boat

Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 with Pro.

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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
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Flying AntsHatch
1
2
1
Gray DrakeHatch
1
1
CallibaetisHatch
1
2
2
2
1

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

Ranked for today
Cutthroat Trout fly box
CH
Chironomid
12-16 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Montana stillwater regulations — check FWP
  • Handle Arctic grayling with care.
What's coming
Plan ahead
5-day outlook
Condition match
100%
Cloud100%
Wind100%
Temp100%

Conditions are ideal for Hyalite Reservoir — wind, cloud and temperature all line up.

Fishing better nearby · 5
Gallery · 2
  1. Hyalite Reservoir with mountain reflections near Bozeman, Montana
    Hyalite Reservoir, Bozeman, Montana
  2. Terrain map of the venue
    Terrain map
About this water

Hyalite is a high mountain reservoir up the canyon south of Bozeman, ringed by peaks and ice-locked half the year, holding cutthroat, Arctic grayling, and brook trout in cold, clear water. It's a short drive from town but it fishes like backcountry — float a tube along the timbered shoreline, work a small leech or a chironomid, and enjoy fish that don't see a lot of flies. The grayling are a treat and worth handling with care. The season is short up here, hemmed in by snow at both ends, so you take the high-country summer when it comes.

  • Reservoir
  • Mixed
Water quality · US Clean Water Act
  • Aquatic lifeSupporting
What this classification means

EPA ATTAINS assessment unit 'Hyalite Reservoir' (MT41H006_010), 2021 Integrated Report. Aquatic Life use: Fully Supporting. 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) · MT41H006_010

Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Cloud cover (cloud) suits the fishery well.
  • Temperature (cool) is in the sweet spot for autumn fishing.
Directions
Seasons & zones
  • Trout Third Saturday of MayLast day of November
Related guides
Booking & contacts