Freestone · Limestone · Cuenca, Castilla-La Mancha

Río Júcar (Cabecera — Cuenca)

Nacimiento del Júcar
Today · About as good as it gets
Greenwell's Spider
Forecast · Today
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% projected
Today's fly
Greenwell's Spider
Greenwell's Spider
Conditions on the water · Today
Live gauge
Flow
Steady
1.6 m³/s
Water temp15.2°C
ClarityClear
Weather25°C
WindN 12 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead5.8 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
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 — conditions well-balanced, with water temperature particularly in your favour.
Likely species
Mayflies
Caddisflies
Damselflies & dragonflies
Hatch timeline · todayPeak at 16:00

12:00(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 92%
Also:Pale Watery69%Cinnamon Sedge59%Flying Ants55%
Peak emergence window11 food groups active

Peak activity at 16:00 — Blue Winged Olive (Blue Winged Olive, 12 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1

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

Ranked for today
Fly box · Brown Trout
Permits & access
Permit required — see local rules.
  • Castilla-La Mancha fishing licence required; common trout must be released
  • Confirm the specific coto/tramo rules for the stretch you plan to fish.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Río Cabriel
39 km
83
Brown trout
Gallery · 2
  1. Nacimiento del Júcar
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 90%
How the 87 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity81 × 12%9.7
Conditions total= 87
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 April → 30 September

    Castilla-La Mancha 2026 order (Orden 20/2026, 4 Feb): low-mountain trout waters open 1 Apr–30 Sep, high-mountain waters 1 May–15 Oct. Common trout (trucha común) is catch-and-release only basin-wide under the 2026 order. Confirm which band the exact stretch above/below Cuenca city falls into before fishing.

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts