Brown trout (min 35 cm), rainbow trout stocked. Fly-fishing opportunity in accessible mountain terrain. Spring through early autumn best. Car-accessible alpine lake. Check Haut-Jura regulations for permits and daily catch limits.
- Lake
- Limestone
Rules at a glance
- Day tickets
How to fish it · for Trout
When
No strong hatch signals at the moment — general searching tactics should work best.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
Plan B
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Watch for
Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.
Boat — at anchor
Windy conditions suit anchoring in productive areas rather than open-water drifting.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
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Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
2
2
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Trout fly box
Sight-nymphing and technical dry-fly fishing on very clear trout and grayling rivers, with strong mayfly and sedge windows and highly selective fish.
6–10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Condition match
45%
Cloud50%
Wind30%
Temp60%
Conditions are away from Lac des Rousses's sweet spot — it usually fishes best in ripple wind with cloud skies.
Other water nearby · 5
Gallery · 1
Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · FRDR10327
Why this score
- Wind conditions (windy) are not ideal for this water.
Directions
Seasons & zones
- Trout 2nd Saturday of March → 3rd Sunday of September
- Grayling 3rd Saturday of May → 31 December
France national rule: grayling opens 3rd Saturday of May in all waters. In 2nd category waters, grayling remains open until 31 December. Departmental regulations may impose earlier closing dates. Always check the relevant département's 2026 arrêté préfectoral.
Related guides
Booking & contacts
Lac des Rousses
Protected natural lake at the Les Rousses station.
How to fish it · for Trout
When
No strong hatch signals at the moment — general searching tactics should work best.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
Plan B
If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.
Watch for
Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.
Boat — at anchor
Windy conditions suit anchoring in productive areas rather than open-water drifting.
Sub-surface · on the nymphunder the surface
Hatch predictions
Supporters see the full sub-surface read.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
2
2
1
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Trout fly box
Sight-nymphing and technical dry-fly fishing on very clear trout and grayling rivers, with strong mayfly and sedge windows and highly selective fish.
6–10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Condition match
45%
Cloud50%
Wind30%
Temp60%
Conditions are away from Lac des Rousses's sweet spot — it usually fishes best in ripple wind with cloud skies.
Other water nearby · 5
Gallery · 1
Terrain map
About this water
Brown trout (min 35 cm), rainbow trout stocked. Fly-fishing opportunity in accessible mountain terrain. Spring through early autumn best. Car-accessible alpine lake. Check Haut-Jura regulations for permits and daily catch limits.
- Lake
- Limestone
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · FRDR10327
Why this score
- Wind conditions (windy) are not ideal for this water.
Directions
Seasons & zones
- Trout 2nd Saturday of March → 3rd Sunday of September
- Grayling 3rd Saturday of May → 31 December
France national rule: grayling opens 3rd Saturday of May in all waters. In 2nd category waters, grayling remains open until 31 December. Departmental regulations may impose earlier closing dates. Always check the relevant département's 2026 arrêté préfectoral.
Related guides
Booking & contacts
At a glance
Lac des Rousses is a lake in Jura / Haut-Jura (Les Rousses), France. Its recorded elevation is about 1,124 m above sea level and the catchment geology is limestone. Our data lists brown trout, rainbow trout and grayling here. The trout season is recorded as running from 2nd Saturday of March to 3rd Sunday of September. The grayling season is recorded as running from 3rd Saturday of May to 31 December. Best window recorded for anglers: May–September. Core methods listed: Wet fly; nymph; dry fly. Its Water Framework Directive ecological status is recorded as good. Access is recorded as a commercial water paid for per visit. Nearby waters in our listings include Les Truites des Rivières at 5.0 km, Bienne at 20 km and Héria at 28 km.