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

Río Borosa

Río Borosa terrain map
Terrain map

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

Species

A side-water session, not the main event

Low and clear — careful approach country. Long leader, small flies, slower casts.

75% confidence in this read
Water temperature for brown trout
Cool — slow
8°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature5928% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time4513% weight
  • Pressure807% weight
  • Prey Activity3012% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
7.6°C
Estimated
Clarity
Clear
Air temp
8°C
Wind
SW 4 km/h
Calm
Pressure
1017 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
3.7 mm
Light rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

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
Good conditions. Clarity is favourable (95), Prey activity is weakest (30).
Through the year
0–3 scale · May 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.

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.
Directions
Apple MapsGoogle Maps
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
Seasons & zones
  • Troutlate March / early April → mid-August to mid-September
Other water nearby · 5
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