Freestone · Limestone · Andalucía / Jaén (Sierra Mágina), ES

Río Guadalbullón

Guadalbullón River01

A trout river in the lesser-known Sierra Mágina (outside the main Cazorla park).

Today · Closed season
Elk Hair Caddis
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Elk Hair Caddis
Elk Hair Caddis
Conditions on the water · Today
Live gauge
Level
Rising
0.82 m
Lifting fast
Water temp14.1°C
ClarityUnfishable
Weather22°C
WindN 13 km/h
Pressure1020 hPa
Rain · recent1.4 mm
Rain · ahead0.3 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
14°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.
Likely species
Caddisflies
Gammarids
Hatch timeline · todayPeak at 6pm

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 44%
Also:Flying Ants33%Cinnamon Sedge31%Pale Watery26%
Peak emergence window9 food groups active

Peak activity at 6pm — Evening Sedge (Evening Sedge, Weather boost)

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
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Junta de Andalucía licence plus trout surcharge required
  • Guadalbullón rules can differ from the main Cazorla office system, so confirm the exact local coto and permit arrangements before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Upper Guadalquivir
60 km
Brown trout
Gallery · 2
  1. Guadalbullón River01
  2. Terrain map of the venue
    Terrain map
About this water

A trout river in the lesser-known Sierra Mágina (outside the main Cazorla park). Limestone mountain water with stocked rainbow beats managed at Cambil. Streamers, attractors, and nymphs work in managed river-pool habitat. Altitude trout at a quieter Sierra. Local permitting differs from Cazorla — confirm locally.

  • Limestone
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Poor → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES050MSPF011009019 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES050MSPF011009019

The full read · show the working · for Brown Trout · confidence 90%
How the 0 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 activity74 × 12%8.9
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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 late March / early April → mid-August to mid-September
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts