Spate · Limestone · Cantabria, ES

Nansa

Nansa River Pathway Cantabria Spain

A serious western Cantabrian salmonid basin whose salmon status is now more historical and regulatory than practically useful for most anglers.

Today · Closed season
Stonefly Nymph
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Stonefly Nymph
Stonefly Nymph
Conditions on the water · Today
Live gauge
Level
Rising
0.89 m
lowspate
Water temp10.5°C
ClarityUnfishable
Weather10°C
WindN 7 km/h
Pressure1011 hPa
Rain · recent22.3 mm
Rain · ahead8.3 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
Stoneflies
Gammarids
Hatch timeline · todayPeak at 11am

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 32%
Also:Autumn Olive24%
Peak emergence window4 food groups active

Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds as a supporter.

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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 · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Large StoneflyHatch
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 Nansa's annex-driven rules and protected-zone structure matter more than old salmon prestige, so check the exact stretch before travel.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Río Deva
15 km
51
Brown trout · Salmon · Sea trout
Saja
14 km
0
Brown trout · Sea trout
Bullón
16 km
0
Brown trout
Río Escudo
16 km
0
Brown trout
Saja
14 km
Brown trout · Sea trout
Gallery · 2
  1. Nansa River Pathway Cantabria Spain
  2. Terrain map of the venue
    Terrain map
About this water

Rugged limestone character with 5-hour spate response. Rocky tumbling sections alternate with deeper pools. Management and conservation rules are central to the fishing story. Wild brown trout in upper sections and sea trout later in the season are the real practical draw.

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: Good
  • Chemical: Unknown

WFD classification · ES018MSPFES118MAR000480

The full read · show the working · for Brown Trout · confidence 50%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow15 × 22%3.3
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity21 × 12%2.5
Limiting factor: River is stable — Brown Trout prefers medium flow= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
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
  • Trout third Sunday of March → 31 July

Sea trout: Variable seasonal (2026)

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts
At a glance

Nansa is a spate river in Cantabria, Spain. The catchment geology is recorded as limestone, and the water sits at about 580 m above sea level. The river is described as roughly 46 km long. Species listed for this water: brown trout and sea trout. The trout season is recorded as running from third Sunday of March to 31 July. Best window recorded for anglers: April–July for trout, with sea trout interest later in the legal season. Core methods listed: wet fly; euro nymphing; dry fly. Level and flow data for this water is linked from 2 gauges. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Saja at 14 km, Saja at 14 km and Río Deva at 15 km.