Freestone · Limestone · Alps / Haute-Savoie (Glières)

Borne

Mountain stream with ice-fringed banks and green pools flowing over boulders near Pont de Beffay on the Borne river, Haute-Savoie
Contributor photo

The Borne river in winter, Pont de Beffay, Petit-Bornand-les-Glières

C. Servage / Photothèque de Petit-Bornand

Mountain river in the Bornes-Glières area with strong wild fario population.

Good · Brown Trout
Small Perdigón · 16-20
Goodlive now
A proper day on the water
Low and clear — careful approach country. Stay small, stay accurate.
75% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp17.8°C
  • ClarityClear
Today’s fly
Small Perdigón
Small Perdigón16-20
Euro-nymph
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp17.8°C
ClarityClear
Weather18°C
WindE 4 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead29.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
18°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.
Why this works
Good — water clarity is working for you, but time of day is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read 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 · July 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
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
Permits & access
Permit required — see local rules.
  • Carte de pêche AAPPMA.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Arly
4.0 km
Brown trout
Lac d'Annecy
16 km
Brown trout · Char
Nom
20 km
38
Brown trout
Fier
22 km
12
Brown trout
Fillière
24 km
12
Brown trout
Gallery · 2
  1. Mountain stream with ice-fringed banks and green pools flowing over boulders near Pont de Beffay on the Borne river, Haute-Savoie
    The Borne river in winter, Pont de Beffay, Petit-Bornand-les-Glières
  2. Terrain map of the venue
    Terrain map
About this water

Mountain river in the Bornes-Glières area with strong wild fario population. Alpine freestone on granite. No-kill management protects local-strain trout. Short season from snowmelt (June onward best). Technical fishing in pocket water and small pools. Solitude and mountain scenery part of the appeal. Check Haute-Savoie regulations for permits and access.

  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · FRDR10114

The full read · show the working · for brown trout · confidence 75%
How the 65 is built — score × weight = contribution
Temperature60 × 28%16.8
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Conditions total= 65
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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
Apple MapsGoogle Maps
Seasons & zones
  • Trout2nd Saturday of March → 3rd Sunday of September
  • Grayling3rd Saturday of May → 3rd Sunday of September

    France national rule: grayling opens 3rd Saturday of May in all waters. In 1st category (salmonid) rivers, grayling closes with the trout season on the 3rd Sunday of September. Departmental regulations may impose additional restrictions. Always check the relevant département's 2026 arrêté préfectoral.

Related guides
Grayling Playbookgrayling tacticsPyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts