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
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Borne
  • Water temp6.7°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 temp6.7°C
ClarityClear
Weather2°C
WindSE 3 km/h
Pressure1016 hPa
Rain · recent42.6 mm
Rain · ahead22.7 mm

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

Water temperature for Brown Trout
Cool — slow
7°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.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 4 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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

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Evidence
Survey-backed · regionalHigh confidence

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

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
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

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 75%
How the 0 is built — score × weight = contribution
Temperature45 × 28%12.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity36 × 12%4.3
Conditions total= 62
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Borneproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
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
At a glance

Nom is a freestone river in Haute-Savoie, France. It sits at about 840 m above sea level. The species listed for this water is brown trout. The trout season is recorded as running from 2nd Saturday of March to 3rd Sunday of September. Its Water Framework Directive ecological status is recorded as moderate. Access is recorded as a commercial water paid for per visit. Nearby waters in our listings include Borne at 9.0 km, Arly at 16 km and Fillière at 18 km.