Freestone · Mixed · Haute-Savoie, FR

Nom

A rushing forest river, the Nom, flowing over rocks and fallen branches through golden autumn trees near Thones, Haute-Savoie, France.

The Nom is the river you fish when you want to remember why you started doing this in the first place.

Poor · Brown Trout
Hare's Ear Nymph · 14-16
New ruleReported 20 Aug 2026

Severe drought restrictions (alerte renforcée) in force

VigiEau lists this venue's surface-water zone (Fier, dépt 74) at alerte renforcée, under an official préfectoral drought arrêté. Fishing is not itself banned by it, but water levels are low — go gently on stressed fish.

Arrêté préfectoral n°37745 ↗

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date.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

Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Borne
  • Water temp13.7°C
  • ClarityClear
Today's fly
Hare's Ear Nymph
Hare's Ear Nymph14-16
Upstream
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Borne
Water temp13.7°C
ClarityClear
Weather15°C
WindE 3 km/h
Pressure1022 hPa
Rain · recent0.0 mm
Rain · ahead24.3 mm

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

Water temperature for Brown Trout
Ideal
14°C est.ideal 10–16°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.
Likely species
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Survey-backed · regionalHigh confidence

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

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
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1

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
Other water nearby · 5
Gallery · 2
  1. A rushing forest river, the Nom, flowing over rocks and fallen branches through golden autumn trees near Thones, Haute-Savoie, France.
    Le Nom @ Circuit Jean-Jacques Rousseau @ Thones
  2. Terrain map of the venue
    Terrain map
About this water

The Nom is the river you fish when you want to remember why you started doing this in the first place. It's small — small enough that the far bank is sometimes your own bank a few yards upstream — and it holds wild brown trout that have never seen a stocked fish and don't want to. You'll kneel more than you cast. You'll curse the overhanging branches. And somewhere around mid-morning, if the light is right and the olives are coming off, you'll drop a size 16 into the right seam and watch a six-inch trout materialise from a slick of water you'd have sworn was empty. Short rods, long leaders, light tippet — nothing else will fit. Spring snowmelt keeps it running cold into June, and by July the low-water trout become properly suspicious, which is, of course, the point.

  • Mixed
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Good → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRDR539B (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRDR539B

The full read · show the working · for Brown Trout · confidence 90%
How the 0 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 activity53 × 12%6.4
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Borneproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Booking & contacts