Freestone · Limestone · Andalucía / Jaén (Sierra de Cazorla), ES

Río Borosa

The Río Borosa flowing upstream below the Cerrada de Elías narrows, Sierra de Cazorla.

One of Cazorla's most celebrated rivers — a Guadalquivir tributary with a sin muerte coto protecting wild native browns.

Poor · Brown Trout
Perdigón · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.08 mLast reading 56 min ago
  • Water temp18.2°C
  • ClarityClear
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.08 m
Last reading 56 min ago
Water temp18.2°C
ClarityClear
Weather22°C
WindSE 3 km/h
Pressure1016 hPa
Rain · recent6.4 mm
Rain · ahead0.5 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
Warm — slow
18°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
Water at 18.2°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

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 2 guilds with Pro.

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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 · 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
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
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Junta de Andalucía licence plus trout surcharge required
  • Borosa access and beat rules should be checked against the current BOJA order and local coto conditions before travel.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 6
  1. The Río Borosa flowing upstream below the Cerrada de Elías narrows, Sierra de Cazorla.
    Río Borosa below the Cerrada de Elías
  2. The Río Borosa in the Sierras de Cazorla, Segura y Las Villas natural park, Andalucía.
    Río Borosa, Cazorla Natural Park
  3. The Cerrada de Elías gorge on the upper Río Borosa, the narrow canyon between limestone walls.
    Cerrada de Elías gorge, Río Borosa
  4. The Cerrada del Elías canyon on the Río Borosa, gorge walls and river corridor.
    Cerrada del Elías canyon, Río Borosa
  5. Natural plunge pools on the Río Borosa below Torre del Vinagre, Sierra de Cazorla.
    Plunge pools on the Río Borosa
  6. Terrain map of the venue
    Terrain map
About this water

One of Cazorla's most celebrated rivers — a Guadalquivir tributary with a sin muerte coto protecting wild native browns. Steep limestone gorge and crystal-clear water create spectacular landscape (the Cerrada de Elías is stunning). Mountain-river fishing: dry fly and short-line nymphing demanding delicate presentation and technical wading. The Borosa walking trail runs alongside, so expect shared access. A river where geology and conservation align.

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

WFD ecological status High → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES050MSPF011012023 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES050MSPF011012023

The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature53 × 28%14.8
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 74
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 10–16 °C ideal band — would lift the score and ease welfare.
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