Freestone · Mixed · Pyrénées-Atlantiques, FR

Gave d'Ossau

A wide clear river with turquoise water flowing over gravel past a forested limestone ridge in the Pyrenees

The Gave d'Ossau is upper Béarn — snowmelt-fed Pyrenean freestone dropping out of the Pic du Midi country and running north through the valley towards Oloron, where it feeds the bigger Gave system.

Poor · Brown Trout
Pheasant Tail Nymph · 14–18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.09 mLast reading 3h ago
  • Water temp10.5°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14–18
Upstream
Conditions on the water
Live gauge
Level
Steady
0.09 m
Last reading 3h ago
Water temp10.5°C
ClarityClear
Weather12°C
WindS 4 km/h
Pressure1010 hPa
Rain · recent17.3 mm
Rain · ahead7.7 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Ideal
11°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season. Spring olives once snowmelt drops; sedges through summer; small dark flies into autumn close.
Where
Pool tails and pocket water through the Ossau valley. Pyrenean piedmont character — clear water, intimate scale.
Method
Upstream dry to risers; nymph the deeper pockets between hatches. Short casts, quiet wading.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Likely species
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 6 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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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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

More balanced than the mountain-river pack. French nymphing still matters, but there is more room for dries, spiders and general searching flies.

What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
  1. A wide clear river with turquoise water flowing over gravel past a forested limestone ridge in the Pyrenees
    The Gave d'Ossau at Castet
  2. Terrain map of the venue
    Terrain map
About this water

It carries wild brown trout throughout its middle and upper reaches and holds them in the kind of fast, cold water that rewards anyone willing to get into it properly. The reaches around Laruns and Sévignacq-Meyracq are fly-only no-kill, barbless on a single hook, and the AAPPMA has been managing the fishing with more care than most. Tight-line nymphing with beadheads is the staple for the pocket water; by late June the caddis and olives start triggering genuine dry-fly windows in the evenings. Snowmelt keeps it cold into July, which means the prime window stretches further here than on the lower Gave — a Pyrenean river that looks like the postcard and fishes like one.

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

WFD classification · FRFR256A

The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity49 × 12%5.9
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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
At a glance

Gave d'Ossau is a freestone river in Pyrénées-Atlantiques, France. It sits at about 429 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. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Gave d'Aspe at 16 km, Gave de Pau at 18 km and Gave d'Oloron at 20 km.