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Rivers

River San

The last big wild grayling river in central Europe, with a fly-only reach above Sanok.

Region
Podkarpacie, south-eastern Poland
Country
Poland
Water type
Large Carpathian mountain river with a wild, unregulated upper reach
Species
grayling, brown, rainbow
Length
458 km
Typical flow
1,000–5,000 cfs; the upper San is a spate river and rises quickly
Season
Grayling 1 May to 31 October; brown trout all season; barbel and chub in high summer
Best months
Jun · Jul · Sep · Oct
Published
2026-10-28

By The Fly Desk

Fly plate: Polish Woven Nymph
Plate 1 · dressing
Aquatic insect plate: March Brown (Rhithrogena)
Plate 2 · insect

Hatch timeline

  • May · 11:00-16:00March Brown (Rhithrogena) Dun

    #12-14 · May · Hatch

  • Jun · 20:00-22:30Blue-Winged Olive (Serratella) Dun at dusk

    #16-18 · Jun · Hatch

  • Jun · 12:00-17:00Grannom caddis (Brachycentrus) Adult

    #14 · Jun · Hatch

  • Jul · 21:00-00:30Caddis (Hydropsyche) Adult, night

    #12-16 · Jul · Hatch

  • Sep · 14:00-17:00Blue-Winged Olive (Serratella) Spinner fall

    #16-18 · Sep · Hatch

  • Oct · 11:00-16:00Grayling nymphs and shrimps All stages

    #14-18 · Oct · Hatch

Matched fly box

PatternImitatesSizeTechnique
Polish Woven NymphStonefly nymph#10-12Tight-line upstream through the rubble runs; the local standard.
Klinkhamer, oliveEmerging olive#14-16Hang it in the film where the current breaks over gravel.
Grayling Pink TagShrimp#14Short-line nymph for shoaled grayling in the pool tails.
Wolly Bugger, blackLeech#6Swing it through the deep bends at dusk for brown trout.

The river

The San rises in the Bieszczady mountains near the Ukrainian border, and the upper 100 km runs through a national park and some of the wildest country in central Europe. There are several dams on the middle river, but above Sanok the San is largely free-flowing, with a strong wild grayling population and good brown trout. It is one of the last places in the region where you can catch 40 grayling in a day on dry flies.

On this river

The upstream nymph drift

On the San the standard grayling method is a long upstream drift with two tungsten nymphs on a 5-metre leader and a highly visible indicator. Grayling take on the drop, not on the lift, so keep the rod tip following the indicator and strike downstream rather than upstream.

Evening dry fly for grayling

From June the olives and caddis bring grayling to the surface in the last two hours of light, and they rise more confidently than trout. Use a single #16 Klinkhamer or a small CDC emerger, cast across and let it drag very slightly — a subtly dragging fly often out-fishes a perfect dead drift for grayling.

Wading a big mountain river

The San's bed is made of rounded Carpathian cobbles, which move underfoot. Wear studded soles rather than rubber, use a staff in anything above knee depth, and cross only where you can see the bottom. Most accidents on this river happen on the walk back in the dark, so plan your exit before you start fishing.

Licence and rules

Poland requires a fishing licence from the Polish Angling Association (PZW), and visiting anglers can buy a temporary licence plus a day permit for the specific water. The upper San above Sanok has fly-only, catch-and-release sections for grayling, and the national park section requires an additional park permit. Local permits are sold at PZW offices in Sanok, Lesko and Solina.
When should I come?

The best months are Jun · Jul · Sep · Oct. Grayling 1 May to 31 October; brown trout all season; barbel and chub in high summer

What licence do I need?

Poland requires a fishing licence from the Polish Angling Association (PZW), and visiting anglers can buy a temporary licence plus a day permit for the specific water. The upper San above Sanok has fly-only, catch-and-release sections for grayling, and the national park section requires an additional park permit. Local permits are sold at PZW offices in Sanok, Lesko and Solina.

How does the water behave?

The upper San is a spate river fed by Carpathian rain, and it can be unfishable for a week after a wet spell. The Solina dam on the middle river moderates flows below it, so the reach at Lesko is usually clearer and more stable than the wild water above. Summer low water is the classic grayling condition, and the fishing is best in the two hours before dark.

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