Spate · Limestone · Cantabria, ES

Miera

Miera — Rio Miera La Cavada
Contributor photo

Rio Miera La Cavada

Tony Rotondas (https://commons.wikimedia.org/wiki/User:Tony_Rotondas) - CC BY-SA

The Miera is Cantabria's premier pure trout water — limestone spring-fed clarity combined with compact, responsive catchment ideal for technical sight-fishing.

Marginal · Brown Trout
Klinkhammer · 14-18
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level0.61 m
  • Water temp19.1°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.61 m
lowspate
Water temp19.1°C
ClarityClear
Weather21°C
WindW 9 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead2.9 mm

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

Water temperature for brown trout
Warm — slow
19°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 19.1°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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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 · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Sea trout runRun
1
1
Trout seasonSeason
1
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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 pesca de Cantabria
  • El Miera es ante todo agua trucheña, pero conviene verificar por anexo el tramo exacto, las normas de días de pesca y cualquier condición de no-kill designada.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Miera — Rio Miera La Cavada
    Rio Miera La Cavada
  2. Terrain map of the venue
    Terrain map
About this water

The Miera is Cantabria's premier pure trout water — limestone spring-fed clarity combined with compact, responsive catchment ideal for technical sight-fishing. Rising in karst upstream of Liérganes, it's the fastest-responding major Cantabrian river (3 hours). Spates develop and subside rapidly; experienced anglers time visits for the brief window of ideal water colour. The 41 km concentrates excellent fishing into relatively small area with numerous day-ticket beats. Limestone ensures exceptional clarity supporting prolific, notably larger wild brown populations. Dry fly is dominant — pocket water demands precision; slower pools reward careful stalking of visible fish. Sea trout July onwards add summer dimension. Easy road access and lodge infrastructure make this the most angler-friendly Cantabrian option for trout specialists.

  • Limestone
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Good → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES018MSPFES086MAR000100 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES018MSPFES086MAR000100

The full read · show the working · for brown trout · confidence 80%
How the 33 is built — score × weight = contribution
Temperature38 × 28%10.6
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Conditions total= 52
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
  • Sea troutJuly → August
  • Trout1 April → 31 July

Sea trout: Variable seasonal (2026)

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts