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

Río Borosa

The Río Borosa flowing upstream below the Cerrada de Elías narrows, Sierra de Cazorla.
Poor · Brown Trout
Foam Beetle · 14-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • Level0.09 mLast reading 7h ago
  • Water temp22.3°C
  • ClarityClear
Today's fly
Foam Beetle
Foam Beetle14-18
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
0.09 m
Last reading 7h ago
Water temp22.3°C
ClarityClear
Weather30°C
WindW 13 km/h
Pressure1019 hPa
Rain · recent6.2 mm
Rain · ahead5.4 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
22°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 22.3°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read 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 22°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
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 10 is built — score × weight = contribution
Temperature5 × 28%1.4
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Limiting factor: Water temperature (22.3°C) is outside Brown Trout's preferred range (10–16°C)= 56
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