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.

Today · Closed season
Czech Nymph
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Czech Nymph
Czech Nymph
Conditions on the water · Today
Live gauge
Level
Rising
0.13 m
Lifting fast
Water temp10.7°C
ClarityUnfishable
Weather17°C
WindN 10 km/h
Pressure1021 hPa
Rain · recent5.3 mm
Rain · ahead0.4 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
Ideal
11°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
Stoneflies
Caddisflies
Gammarids
Hatch timeline · todayPeak at 12pm

12pm(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 35%
Also:Autumn Needle Fly23%Black Midge21%
Peak emergence windowWeather boost7 food groups active

Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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 · 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
  • 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
Río Castril
19 km
0
Brown trout
Upper Guadalquivir
7.0 km
Brown trout
Río Madera (Bajo)
29 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
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
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 86
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
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