Freestone · Mixed · Navarra

Río Ulzama

Río Ulzama terrain map
Terrain map

A major Arga tributary flowing from mixed granite-limestone Sierra de Aralar north to Pamplona.

Species

A side-water session, not the main event

River high but settled. Tributary pocket water is the better play today.

75% confidence in this read
Water temperature for brown trout
Cool — slow
6°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature3128% weight
  • Flow9522% weight
  • Clarity9518% weight
  • Feeding Time5013% weight
  • Pressure807% weight
  • Prey Activity2712% weight
Conditions
Level
1.98 m
Water temp
5.7°C
Estimated
Clarity
Clear
Clearing
Air temp
5°C
Wind
N 6 km/h
Light breeze
Pressure
1019 hPa
Rain · 48h
1.8 mm
No meaningful rain
Rain · ahead
2.7 mm
Light rain · next 48h

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

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
Good conditions. Flow is favourable (95), Prey activity is weakest (27).
Through the year
0–3 scale · May 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.

Permits & access
Permit required — see local rules.
  • Gobierno de Navarra fishing licence required
  • The Ulzama is one of the easier day-trip trout options from Pamplona, but the exact tramo and permit logic still needs checking before travel.
Directions
Apple MapsGoogle Maps
About this water

A major Arga tributary flowing from mixed granite-limestone Sierra de Aralar north to Pamplona. Accessible from the city, offering excellent upper and middle trout water — limestone gorges alternate with open pastoral valleys. Brown trout throughout; trout in lower sections after spates. Fast snowmelt response with consistent summer base flow. Technical nymphing and dry fly in gorges; pool-and-run fishing in valleys. Popular weekend escape from the city.

  • Mixed
Seasons & zones
  • Trout1 May → 30 June
Other water nearby · 5
Booking & contacts