Freestone · Limestone · Trentino-Alto Adige, IT

Sarca

Photo of Sarca

Trentino river flowing into Lake Garda with clear limestone water and excellent hatches.

Today · About as good as it gets
Stonefly Nymph
Forecast · Today
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% projected
Today's fly
Stonefly Nymph
Stonefly Nymph
Conditions on the water · Today
Live gauge
Level
Steady
0.16 m
Water temp8.2°C
ClarityClear
Weather12°C
WindN 6 km/h
Pressure1026 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Grayling
Ideal
8°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Autumn into late autumn is prime — September through November. The Italian closed season for grayling varies by region; check the FIPSAS regional permit before booking.
Where
Faster water at the heads of riffles, gravel runs, and deeper glide tails. The lower and middle Sarca holds grayling in classic Alpine pocket water.
Method
Euro-nymphing primary — Perdigons and small dropper nymphs through the pocket water. Switch to dries when sedges or olives come off in autumn afternoons.
Kit
10 ft #3 nymphing rod, 4 to 5 lb fluoro tippet; 9 ft #4 for dries. 12 ft leader. Studded boots.
Why this works
Excellent — water temperature is working for you, but time of day is the limiting factor today. Grayling is active in the cooler margins of the season.
Likely species
Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
Hatch timeline · todayPeak at 11am

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 93%
Also:Black Midge52%Iron Blue31%
Peak emergence window7 food groups active

Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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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 · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Alpine RhithrogenaHatch
2
3
3
2
Sculpin / Baitfish (Rivers)Hatch
2
3
3
3
3
3
3
3
2
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Grayling 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.

Permits & access
Permit required — see local rules.
  • Italian fishing license (permesso di pesca) varies by provincia (province)
  • Barbless hooks often required on protected waters
  • Catch limits may apply.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Lake Molveno
8.0 km
Brown trout · Char
Adige Tributaries (Trentino)
19 km
Brown trout · Marble trout
Lake Caldonazzo
29 km
Brown trout · Char
Noce
31 km
Brown trout · Marble trout · Grayling
Lake Levico
32 km
Brown trout · Char
Gallery · 2
  1. Photo of Sarca
    Sarca
  2. Terrain map of the venue
    Terrain map
About this water

Trentino river flowing into Lake Garda with clear limestone water and excellent hatches. Marble trout in the main river, brown trout and grayling in tributaries. The water clarity rewards close observation and fine presentation. Euro nymphing and dry-dropper techniques both work well. Permit-driven beats.

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

WFD classification · IT22E100000000100TN

The full read · show the working · for Grayling · confidence 55%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
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 2026-02-15 → 2026-10-07
  • Grayling varies_by_water → varies_by_water

    Alto Sarca 2026 regulations (English rules published) explicitly prohibit grayling retention — grayling is present but no-retention (catch-and-release only or entirely protected). Sarca fishing requires the Alto Sarca Fishing Association permit. Check the English 2026 rules at campigliodolomiti.it before fishing grayling here.

    All grayling must be returned — retention is prohibited here.

  • Marble trout 2026-03-01 → 2026-09-30
Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts