Freestone · Gneiss · Lombardy

Adda (Valtellina)

Adda (Valtellina) terrain map

The Adda through Valtellina is proper big-water Alpine trout fishing — wide gravel runs and long glides fed by snowmelt and glacier off the Rhaetian Alps above Bormio, the gneiss and schist bedrock keeping the water hard and clear even after a lift.

Poor · Brown Trout
Elk Hair Caddis · 12-16
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.4°C
  • ClarityClear
Today's fly
Elk Hair Caddis
Elk Hair Caddis12-16
Upstream dry, on top
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.4°C
ClarityClear
Weather25°C
WindS 4 km/h
Pressure1025 hPa
Rain · recent0.0 mm
Rain · ahead2.1 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Warm — slow
22°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Lombardy trout season — hatches build through spring afternoons, sedges carry summer evenings, and small dark flies matter into autumn. Flows track snowmelt and glacial melt through the warmer months, so expect a daily rhythm as much as a seasonal one.
Where
Long gravel runs and glides through the Valtellina floor, with better fish holding in the deeper seams and under the cut banks below the vineyard terraces.
Method
Upstream nymph through the faster water; dry fly or emerger in the glides once fish are looking up. No-Kill fly beats mandate single barbless hooks and artificials only — comply or fish elsewhere.
Kit
9 to 10 ft #5 for bigger freestone water than the Trentino rivers in this pack. Floating line, 12 ft leader to 4 to 5 lb fluoro. Wading staff useful on the smoother cobble sections.
Why this works
Water at 22.4°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

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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

A fuller Italian trout and grayling box for the southern Alps and northern limestone/alpine systems. It keeps the marble-trout streamer accent, but adds proper grayling dries and bugs, competition nymphs, caddis/olive work, terrestrials, pocket-water dries and alpine lake patterns.

FC
Foam Caddis / Sedge Hog
12-16 · Pattern
Upstream dry, on top
Gammarus Scud (Olive)
Gammarus Scud (Olive)
12-16 · Gammarus Scud
Dead-drift, sub-surface
Permits & access
Permit required — see local rules.
  • Regional Lombardy fishing licence plus a seasonal or daily permit from the Unione Pesca Sportiva della Provincia di Sondrio (UPS) required
  • Marble trout and hybrids must always be released
  • No-Kill fly zones (Fascia A, B, D — blue signage) require artificial lures or flies, barbless hooks, and zero retention; Fascia C allows limited retention on artificials only
  • Grayling may be retained in season subject to minimum size and a seasonal cap
  • Confirm the current year's exact dates and zone boundaries at unionepescasondrio.it before fishing.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
About this water

The Adda through Valtellina is proper big-water Alpine trout fishing — wide gravel runs and long glides fed by snowmelt and glacier off the Rhaetian Alps above Bormio, the gneiss and schist bedrock keeping the water hard and clear even after a lift. By the time it reaches the beats around Tresenda and Piateda it's carrying serious numbers of brown trout, marble trout and hybrids, and grayling that fish hard enough to earn their keep. The marble trout is the fish everyone comes for and nobody keeps — it goes straight back here, as everywhere in its native range. Grayling get treated rather more generously than in Trentino, which after a season of blanket no-retention rules feels almost indulgent. The No-Kill fly reaches, marked with blue signage, are where the fishing turns technical: long leaders, careful footwork on smooth cobble, and trout that have already seen most of what's in the box. Vineyard terraces climb the valley sides the whole way down, which is no bad way to spend an August afternoon between fish.

  • Gneiss
The full read · show the working · for Brown Trout · confidence 90%
How the 8 is built — score × weight = contribution
Temperature4 × 28%1.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
Limiting factor: Water temperature (22.4°C) is outside Brown Trout's preferred range (10–16°C)= 58
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout varies_by_water → varies_by_water
  • Grayling varies_by_water → varies_by_water

    Grayling can be retained in season on the Adda main-stem (minimum 40cm, versus 35cm on other Sondrio waters) with a 15-fish seasonal limit and typically 1-2 per day depending on zone. Retention is banned outright in several defined stretches, including Adda from the Baghetto weir down to the start of the Piateda No-Kill zone — check the current UPS regulation for exact boundaries before keeping a fish.

    Rules are set at province or association level — check locally.

  • Marble trout varies_by_water → varies_by_water
Related guides
Euro Nymphingsubsurface methods
Booking & contacts