Skip to content

Rivers

All riversHatch chartMataura RiverBig LaxáGaula RiverRiver SanRiver UnaRiver TweedMiramichi RiverBow RiverWhite River, ArkansasDavidson RiverPenns CreekLetort Spring RunFarmington RiverPere Marquette RiverNorth Umpqua RiverDeschutes RiverSan Juan RiverFryingpan RiverYellowstone RiverBighorn RiverTraun RiverBeaverkill RiverRío GrandeGreen River below Flaming GorgeRiver WharfeHenry's Fork of the SnakeSoča RiverAu Sable RiverTongariro RiverSouth Platte — Deckers and CheesmanRiver TestMadison River

Insects

Brown troutRainbow troutMountain whitefishBrook troutCutthroat troutSteelheadAtlantic salmonEuropean graylingMarble troutSea troutArctic charSea-run brown troutResident brown trout

Techniques

Reading waterMatching a hatchNymphingDry-fly presentationStreamer fishingSwinging a flyCatch and release, done properlyTying flies you will actually fish

About

AboutContactPrivacyTerms
RiffleRiver ledger
Rivers

River San · hatch chart

Grayling 1 May to 31 October; brown trout all season; barbel and chub in high summer

By The Fly Desk · Published 2026-10-28

By month

JanFebMarAprMayJunJulAugSepOctNovDec
MonthInsectStageSizeTimeIntensity
MayMarch Brown (Rhithrogena)Dun#12-1411:00-16:00
JunBlue-Winged Olive (Serratella)Dun at dusk#16-1820:00-22:30
JunGrannom caddis (Brachycentrus)Adult#1412:00-17:00
JulCaddis (Hydropsyche)Adult, night#12-1621:00-00:30
SepBlue-Winged Olive (Serratella)Spinner fall#16-1814:00-17:00
OctGrayling nymphs and shrimpsAll stages#14-1811:00-16:00

Flow and visibility

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.

The insect plate

Aquatic insect side view: March Brown (Rhithrogena)
Plate 2 · insect, side view

See the matched fly box →