Freestone · Limestone · Castilla y León, ES

Río Jerea

Río Jerea terrain map

A short Burgos limestone trout river rising in the Montes de Ordunte and joining the Ebro near Trespaderne.

Today · Closed season
Pheasant Tail Nymph (sz 18)
Forecast · Today
Closed season
Out of season. Plenty of other water available now.
90% projected
Today's fly
Pheasant Tail Nymph (sz 18)
Pheasant Tail Nymph (sz 18)
Conditions on the water · Today
Live gauge
Level
Steady
0.18 m
Water temp13.7°C
ClarityClear
Weather20°C
WindN 9 km/h
Pressure1023 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
14°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 11am

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 81%
Also:Cinnamon Sedge50%Pale Watery45%
Peak emergence window10 food groups active

Peak activity at 11am — Reed Smut (Reed Smut, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

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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
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.
  • Castilla y León licence required
  • Burgos provincial tramo rules apply.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Ebro (Burgos — Las Merindades to Miranda)
3.0 km
0
Brown trout
Río Trueba
25 km
0
Brown trout
Río Carranza
45 km
0
Brown trout
Río Nela
23 km
Brown trout
Río Omecillo
26 km
Brown trout
About this water

A short Burgos limestone trout river rising in the Montes de Ordunte and joining the Ebro near Trespaderne. The Jerea is intimate water — narrow, often shaded by oak and beech, with classic small-river pool-and-riffle structure. Wild brown trout only. Best fished from late April through June in the middle reaches around Virués; the upper limestone sections hold up later into summer.

  • Limestone
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity47 × 12%5.6
Conditions total= 79
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts