Spate · Limestone · Cantabria, ES

Miera

Miera — Rio Miera La Cavada

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

Poor · Brown Trout
Klinkhammer · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.18 mDropping after lift
  • Water temp21.2°C
  • ClaritySlightly colouredClearing
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.18 m
lowspate
Water temp21.2°C
ClaritySlightly coloured
Weather24°C
WindNW 14 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead1.1 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
21°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 21.2°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Through the year
0–3 scale · August 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.
  • Cantabrian fishing licence required
  • The Miera is trout-first water, but exact stretch, fishing-day rules, and any named no-kill conditions still need checking by annex.
What's coming
Plan ahead
5-day outlook
Water here around 21°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.

Hatches & food

In Cantabria's shorter mountain and foothill trout rivers, fish make the most of spring olives and stoneflies in clear windows between freshets, then switch to evening caddis and small buzzers through the warmer months, with terrestrials becoming a key option in sheltered glides and under tree cover once summer settles in.

  • 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 0 is built — score × weight = contribution
Temperature12 × 28%3.4
Flow15 × 22%3.3
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity50 × 12%6.0
Limiting factor: Water temperature (21.2°C) is outside Brown Trout's preferred range (10–16°C)= 41
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Sea trout July → August
  • Trout 1 April → 31 July

Sea trout: Variable seasonal (2026)

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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