Freestone · Limestone · Haute-Savoie

Usses

A clear forest stream, the Usses river, flowing over rocks between snow-covered trees near Cruseilles, Haute-Savoie, France.

The Usses runs in limestone gorges through the Albanais country south of Annecy — one of those rivers that belongs to its landscape so completely you can't imagine it anywhere else.

Marginal · Brown Trout
Small Perdigón · 16-20
New ruleReported 1 Aug 2026

Severe drought restrictions (alerte renforcée) in force

The Usses zone (Dept 74) is at alerte renforcée — the second-highest French drought tier — under a préfectoral arrêté. Fishing itself is not named as prohibited, but water is severely restricted and flows are likely very low; fish with care and check locally.

Arrêté préfectoral n°37507

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date. Always confirm locally before travelling.

Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • LevelProxyvia Ain
  • Water temp18.7°C
  • ClarityClear
Today's fly
Small Perdigón
Small Perdigón16-20
Euro-nymph
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Ain
Water temp18.7°C
ClarityClear
Weather21°C
WindNE 5 km/h
Pressure1020 hPa
Rain · recent6.0 mm
Rain · ahead2.0 mm

No gauge on this water — conditions are inferred from Ain. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Warm — slow
19°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
Water at 18.7°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
March BrownHatch
2
3
2
Large StoneflyHatch
2
3
2

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

Ranked for today
Brown Trout fly box

French nymph-first water. Fast current, technical presentation, weighted nymphs and emergers, with dry flies when fish rise.

What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. A clear forest stream, the Usses river, flowing over rocks between snow-covered trees near Cruseilles, Haute-Savoie, France.
    Les Usses @ Champ Beau Fond @ Cruseilles
  2. Terrain map of the venue
    Terrain map
About this water

The Usses runs in limestone gorges through the Albanais country south of Annecy — one of those rivers that belongs to its landscape so completely you can't imagine it anywhere else. It fishes as varied as it looks: short pools, pocket water, gravel runs, the occasional slow glide under overhanging oak. Wild brown trout throughout, reasonable hatches of olives and caddis, and pocket water that rewards a nymph bounced through the seams. The gorges make some sections a commitment — you'll be scrambling in and scrambling out — but that's what keeps them quiet. Spring and early summer are the prime window. By August you'll be fishing the faster pockets where the oxygen holds up and the fish are willing to work for the food.

  • Limestone
Water quality (WFD)
  • EcologyModerate
  • ChemicalUnknown

WFD classification · FRDR541A

The full read · show the working · for Brown Trout · confidence 80%
How the 36 is built — score × weight = contribution
Temperature44 × 28%12.3
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
Conditions total= 66
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Ainproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout 2nd Saturday of March3rd Sunday of September
Related guides
Booking & contacts
Clubs & associations