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

Río Borosa

The Río Borosa flowing upstream below the Cerrada de Elías narrows, Sierra de Cazorla.
Today · Closed season
Partridge & Orange
Forecast · Today
Closed season
Out of season. Plenty of other water available now.
90% projected
Today's fly
Partridge & Orange
Partridge & Orange
Conditions on the water · Today
Live gauge
Level
Steady
0.05 m
Water temp16.0°C
ClarityClear
Weather20°C
WindN 12 km/h
Pressure1020 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
Ideal
16°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.
Hatch timeline · todayPeak at 2pm

12pm(now) — Flying Ants

Stage: Terrestrials on topApproach: Dry flyActivity: 76%
Also:Reed Smut75%Cinnamon Sedge66%Pale Watery44%
Peak emergence windowWeather boost10 food groups active

Peak activity at 2pm — Marbled Sedge (Marbled Sedge, Weather boost)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

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
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.
  • Se requiere licencia de la Junta de Andalucía más el recargo de trucha
  • El acceso al Borosa y las normas de los cotos deben comprobarse frente a la orden BOJA vigente y las condiciones locales del coto antes de viajar.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Río Madera (Bajo)
29 km
82
Brown trout
Guadalquivir (upper / Cazorla headwaters)
7.0 km
36
Brown trout · Rainbow trout
Upper Guadalquivir
7.0 km
Brown trout
Río Castril
19 km
Brown trout
Río Zumeta
32 km
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 90%
How the 0 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity62 × 12%7.4
Conditions total= 70
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.
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