Freestone · Limestone · Jura-edge / Ain (Varambon–Rhône)

Ain (lower / Plaine de l'Ain)

A wide, calm stretch of the River Ain with a gravel bank in the foreground and autumn trees lining the far bank, in the Ain department, France.
Contributor photo

The River Ain near Villieu-Loyes-Mollon, on the lower Ain plain

Mairie2vlm CC BY-SA 4.0

The Ain from Varambon to the Rhône confluence flows through limestone with multiple designated no-kill beats and fly-only sections.

Prime · Chub
Daddy Longlegs · Hook 10–12 with knotted pheasant tail legs
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
65% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.5°C
  • ClarityClear
Today’s fly
DL
Daddy LonglegsHook 10–12 with knotted pheasant tail legs
in season · matches water height
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.5°C
ClarityClear
Weather27°C
WindS 11 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead16.9 mm

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

Water temperature for chub
Warm — slow
23°C est.ideal 14–22°C
0°14°28°
How to fish it · for chub
When
March–October
Where
The Ain from Varambon to the Rhône confluence flows through limestone with multiple designated no-kill beats and fly-only sections.
Why this works
Chub: comfort conditions look perfect. Water clarity clear — read accordingly for chub.
Hatch timeline · todayQuiet day

Hatch predictions

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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 · 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
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

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

Ranked for today
Chub fly box
SB
Small Black Streamer
Hook 8–10 weighted · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
  • AAPPMA permits.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Suran
14 km
Brown trout · Grayling
Ain
24 km
Brown trout · Grayling
Chaley Lake
31 km
Brown trout · Rainbow trout
Albarine
35 km
Brown trout · Grayling
Lac de Vouglans
49 km
Rainbow trout · Brown trout
Gallery · 2
  1. A wide, calm stretch of the River Ain with a gravel bank in the foreground and autumn trees lining the far bank, in the Ain department, France.
    The River Ain near Villieu-Loyes-Mollon, on the lower Ain plain
  2. Terrain map of the venue
    Terrain map
About this water

The Ain from Varambon to the Rhône confluence flows through limestone with multiple designated no-kill beats and fly-only sections. Stable spring-fed character, prolific insect life, selective trout and grayling. Chalk-stream water where presentation matters more than fly choice. Spring through early autumn. Some beats private; public access on certain stretches. Verify local regulations.

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

WFD classification · FRDR484

The full read · show the working · for chub · confidence 65%
Perfect · warmwater comfort — temperature and clarity led
Water temperatureWater temp 22.5°C — comfortable.
FlowStable flow — predictable holding lies.
SeasonPrime month for this species.
Water clarityWater clarity clear — read accordingly for chub.
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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.

  • Coarse2nd Saturday of March → 3rd Sunday of September

    Chub has no national closed season of its own in France — on a 1st-category (salmonid) reach like this, ALL fishing (any species, any method) is prohibited outside the water's own open season (Code de l'environnement Art. R436-6), so chub simply inherits the trout/grayling season rather than following a separate coarse-fish law.

Related guides
Grayling Playbookgrayling tacticsPyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
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