Freestone · Granite · Vosges / Haut-Rhin (Vallée de la Doller), FR

Doller

Doller — Espace liberté - Confluent de l'Ill et de la Doller

30 km of 1st-category Vosges mountain river from Oberbruck to Masevaux.

Poor · Brown Trout
CDC Emerger · 16-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • Flow0.1 m³/sLast reading 3h ago
  • Water temp22.4°C
  • ClarityClear
Today's fly
CDC Emerger
CDC Emerger16-18
Dead-drift
Conditions on the water
Live gauge
Flow
Steady
0.1 m³/s
Last reading 3h ago
Water temp22.4°C
ClarityClear
Weather26°C
WindW 5 km/h
Pressure1013 hPa
Rain · recent0.0 mm
Rain · ahead22.0 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
Warm — slow
22°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season. Spring olives April through May; sedges through summer evenings; small dark flies into autumn.
Where
Pool tails and pocket water through the Haut-Rhin valley. Vosges freestone — cool clear water, intimate scale.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet. Move slowly, cast accurately.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Why this works
Water at 22.4°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 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
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
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.

Permits & access
Permit required — see local rules.
  • Alsace AAPPMA permits
  • Fly-only and no-kill parcours common
  • Single barbless hooks required.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Doller — Espace liberté - Confluent de l'Ill et de la Doller
    Espace liberté - Confluent de l'Ill et de la Doller
  2. Terrain map of the venue
    Terrain map
About this water

30 km of 1st-category Vosges mountain river from Oberbruck to Masevaux. Strict fly-only, no-kill, barbless-hook regulation protects local-strain wild trout. Granitic freestone with excellent Baetis and caddis. Every fish represents generations of wild breeding. Spring through early autumn. Check Haut-Rhin regulations for permits and access.

Hatches & food

In Vosges granite catchments, trout in cool freestone streams feed on early and spring olives once levels settle after winter, daytime stoneflies over clean, stony runs, a broad band of evening caddis supported by rich bug life in the region, steady small buzzer activity on mild days, and terrestrials strongest where the river is hemmed in by forest.

  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

WFD ecological status Moderate → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRCR53 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRCR53

The full read · show the working · for Brown Trout · confidence 90%
How the 8 is built — score × weight = contribution
Temperature4 × 28%1.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Limiting factor: Water temperature (22.4°C) is outside Brown Trout's preferred range (10–16°C)= 58
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts