Freestone · Mixed · Navarra

Río Arga

Río Arga venue image
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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
  • Level1.08 m
  • Water temp16.8°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
1.08 m
Water temp16.8°C
ClarityClear
Weather16°C
WindN 21 km/h
Pressure1026 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for brown trout
Warm — slow
17°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.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · July 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
Other water nearby · 5
Río Ulzama
15 km
0
Brown trout
Río Erro
25 km
0
Brown trout
Bidasoa tributaries (Navarra side)
32 km
0
Brown trout · Sea trout
Río Urrobi
28 km
Brown trout
Río Areta
37 km
Brown trout
Gallery · 1
  1. 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 75%
How the 0 is built — score × weight = contribution
Temperature81 × 28%22.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout1 May → 30 June
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts