Freestone · Granite · Morvan / Nièvre, FR

Yonne (Upper, Morvan Headwaters)

Yonne (Upper, Morvan Headwaters) — Le pont Boffrand-Hupeau - Joigny
Prime · Brown Trout
Pheasant Tail Nymph · 14-18
New ruleReported 19 Aug 2026

Severe drought restrictions (crise) in force

A préfectoral drought order places this catchment's surface water at crise, the highest of France's four restriction tiers. Fishing itself is not named in the order, but flows are low and water-use restrictions are in force. Zone: ARROUX MORVAN (dépt 71).

Arrêté préfectoral n°37754 ↗

Temporary notices from official orders and recent fishery reports — they clear automatically once out of date. Always confirm locally before travelling.

Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • LevelProxyvia Sioule
  • Water temp15.1°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
Upstream
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Sioule
Water temp15.1°C
ClarityClear
Weather14°C
WindSW 19 km/h
Pressure1017 hPa
Rain · recent28.9 mm
Rain · ahead3.6 mm

No gauge on this water — conditions are inferred from Sioule. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Ideal
15°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
Excellent — water temperature is right today, though insect activity could be better.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 with Pro.

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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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1

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.
  • AAPPMA Château-Chinon / Fédération de la Nièvre
  • 1ère catégorie standard.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Ferme piscicole du Moulin de la Petite Verrière
3.0 km
Rainbow trout · Brown trout · Char
Pisciculture Moulin Tala
27 km
Rainbow trout
Cure
38 km
Brown trout
Cousin
51 km
Brown trout
Pisciculture Cordier-Gand
59 km
Rainbow trout · Brown trout
Gallery · 2
  1. Yonne (Upper, Morvan Headwaters) — Le pont Boffrand-Hupeau - Joigny
    Le pont Boffrand-Hupeau - Joigny
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: High
  • Chemical: Failing to achieve good
What this classification means

WFD ecological status Good → High and chemical status Good → Failing to achieve good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody FRHR42A (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · FRHR42A

The full read · show the working · for Brown Trout · confidence 90%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Siouleproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Saturday of March → 3rd Sunday of September
Related guides
Pyrenees PlaybookFrench riversEuro Nymphingsubsurface methods
Booking & contacts