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

Río Borosa

The Río Borosa flowing upstream below the Cerrada de Elías narrows, Sierra de Cazorla.
Poor · Brown Trout
Perdigón · 14-18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.09 mLast reading 3h ago
  • Water temp5.9°C
  • ClarityClear
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.09 m
Last reading 3h ago
Water temp5.9°C
ClarityClear
Weather12°C
WindE 4 km/h
Pressure1024 hPa
Rain · recent0.0 mm
Rain · ahead0.0 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
Cool — slow
6°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
Mayflies
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

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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 · October 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.
  • 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
Other water nearby · 5
Guadalquivir (upper / Cazorla headwaters)
7.0 km
0
Brown trout · Rainbow trout
Upper Guadalquivir
7.0 km
0
Brown trout
Río Castril
19 km
0
Brown trout
Río Madera (Bajo)
29 km
0
Brown trout
Río Zumeta
32 km
0
Brown trout
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
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 75%
How the 0 is built — score × weight = contribution
Temperature34 × 28%9.5
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity32 × 12%3.8
Conditions total= 61
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
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