Freestone · Mixed · Navarra

Río Arga

Río Arga — Puente la Reina

Navarra's principal river, an Ebro tributary flowing south through Pamplona.

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
  • Level1.09 mDropping after lift
  • Water temp23.6°C
  • ClarityVery colouredClearing
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
1.09 m
Dropping after lift
Water temp23.6°C
ClarityVery coloured
Weather35°C
WindS 12 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead10.3 mm

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

Water temperature for Brown Trout
Warm — slow
24°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 23.6°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Beyond the hatch · worth watchingambient prey

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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
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
  • Use the exact tramo and daily-permit structure for the section you plan to fish rather than assuming one simple Arga rule.
What's coming
Plan ahead
5-day outlook
Water here around 24°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Río Arga — Puente la Reina
    Puente la Reina
  2. Terrain map of the venue
    Terrain map
About this water

Navarra's principal river, an Ebro tributary flowing south through Pamplona. The Arga rises in the western Pyrenees and joins the Aragón before reaching the Ebro (Mediterranean drainage — no Atlantic salmon access). Limestone and granite headwaters transition to sandstone near the city. Productive brown trout water with pool-and-run structure. Dry fly and nymphing for summer trout in clear upper reaches; water turns brownish during spates.

  • Mixed
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown

WFD classification · ES091MSPF546

The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature0 × 28%0.0
Flow80 × 22%17.6
Clarity15 × 18%2.7
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity30 × 12%3.6
Limiting factor: Water temperature (23.6°C) is outside Brown Trout's preferred range (10–16°C)= 37
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.
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 1 May → 30 June

    RSS Arga–Ultzama basin (922 permits in 2026). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required. Tramo-specific rules apply — check the official web app for stretch-level status.

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