Limestone · Jura / Neuchâtel, CH

Doubs

The Doubs river winding through a wooded limestone gorge near the Saut du Doubs on the Swiss-French border.

Jura limestone river forming part of the French-Swiss border, exceptional grayling fishing and wild brown trout in chalk stream character water.

Poor · Grayling
F-Fly · Hook 18–22
Poorlive now
Not the day for it
River dropping into shape after a lift. Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
55% confidence
What moved it
  • Level743.42 mDropping after lift
  • Water temp15.4°C
  • ClarityUnfishableColouring up
Today's fly
F-Fly
F-FlyHook 18–22
in season · matches water height
Conditions on the water
Live gauge
Level
Steady
743.42 m
Dropping after lift
Water temp15.4°C
ClarityUnfishable
Weather17°C
WindW 5 km/h
Pressure1016 hPa
Rain · recent28.2 mm
Rain · ahead18.1 mm

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

Water temperature for Grayling
Warm — slow
15°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Poor — river flow 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 4 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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Grayling fly box

A compact but high-quality Swiss box covering alpine streams, mountain lakes, and Jura salmonid rivers such as the Doubs.

Permits & access
Permit required — see local rules.
  • Franco-Swiss border river
  • Swiss patent required for Swiss sections, and French rules apply on the French side
  • Do not assume one roaming border permit.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Reverotte
21 km
0
Brown trout · Grayling
Dessoubre
19 km
Brown trout · Grayling
Doubs (France)
30 km
Brown trout · Grayling · Chub
Cusancin
40 km
Brown trout · Grayling
Les piscicultures Côte
51 km
Rainbow trout
Gallery · 2
  1. The Doubs river winding through a wooded limestone gorge near the Saut du Doubs on the Swiss-French border.
    The Doubs gorge near the Swiss-French border, Neuchâtel
  2. Terrain map of the venue
    Terrain map
About this water

Jura limestone river forming part of the French-Swiss border, exceptional grayling fishing and wild brown trout in chalk stream character water. Clear, alkaline flow with superb hatches. The French side has the Loue—a similar classic across the frontier.

  • Limestone
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 FRDR635 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRDR635

The full read · show the working · for Grayling · confidence 55%
How the 20 is built — score × weight = contribution
Temperature59 × 28%16.5
Flow80 × 22%17.6
Clarity10 × 18%1.8
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity42 × 12%5.0
Limiting factor: Water is unfishable — too coloured for Grayling= 48
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 4–14 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September
Related guides
Grayling Playbookgrayling tacticsAlpine Streamsmountain entomologyEuro Nymphingsubsurface methods
Booking & contacts