Freestone · Limestone · Navarra, ES

Río Urrobi

Río Urrobi venue image

A compact limestone Irati tributary draining from the High Pyrenees near the Orbé massif.

Poor · Brown Trout
Pheasant Tail Nymph · 14–18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Río Irati
  • Water temp10.8°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14–18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Río Irati
Water temp10.8°C
ClarityClear
Weather10°C
WindSE 15 km/h
Pressure1014 hPa
Rain · recent17.8 mm
Rain · ahead16.8 mm

No gauge on this water — conditions are inferred from Río Irati. The trend transfers, the absolute level does not.

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
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

Start free trial

14-day free trial. Cancel anytime.

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
1
Daddy Long LegsHatch
2
3
3
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
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.
  • Gobierno de Navarra fishing licence required
  • Check the exact tramo and access status before travel because this is a smaller, more locally sensitive tributary.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Irati
7.0 km
0
Brown trout
Río Erro
9.0 km
0
Brown trout
Río Areta
15 km
0
Brown trout
Río Salazar
19 km
0
Brown trout
Río Ulzama
27 km
0
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Small stream with clear alpine freestone and relatively high summer temperatures. Rapid snowmelt response; flows low by July–August. Wild brown trout throughout. Tight-line nymphing and small dries in broken water. Access limited — largely private forest; seek permission or fish the main Irati stem.

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

WFD ecological status Moderate → High corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES091MSPF533 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES091MSPF533

The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Conditions total= 73
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Río Iratiproxy
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 1 May → 30 June

    RSS Irati–Erro basin (2,728 permits in 2026). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required.

Related guides
Fly Fishing Near Pamplonafeatured in this guidePyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts
At a glance

Río Urrobi is a freestone river in Navarra, Spain. The catchment geology is recorded as limestone, and the water sits at about 745 m above sea level. The river is described as roughly 20 km long. The species listed for this water is brown trout. The trout season is recorded as running from 1 May to 30 June. Best window recorded for anglers: Spring into early summer within the current Navarra tramo calendar. Core methods listed: dry fly; euro nymphing; small wet fly. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as high. Nearby waters in our listings include Río Irati at 7.0 km, Río Erro at 9.0 km and Río Areta at 15 km.