Skip to content

Rivers

All riversHatch chartWhite 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 troutSteelheadEuropean graylingMarble troutSea-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 Test

The birthplace of dry-fly fishing, and still the hardest place to fool a brown trout.

Region
Hampshire, England, United Kingdom
Country
United Kingdom
Water type
Chalk stream, gin-clear, constant temperature
Species
brown, grayling, rainbow
Length
64 km
Typical flow
200–400 cfs, extraordinarily stable because the source is a chalk aquifer
Season
Brown trout from 3 April to 30 September; grayling over the winter on some beats
Best months
Apr · May · Jun · Sep
Published
2026-08-07

By The Fly Desk

Fly plate: Grannom Sedge
Plate 1 · dressing
Aquatic insect plate: Grannom caddis (Brachycentrus)
Plate 2 · insect

Hatch timeline

  • Apr · 12:00-16:00Grannom caddis (Brachycentrus) Adult

    #14 · Apr · Hatch

  • Apr · 13:00-16:00Large Dark Olive (Baetis rhodani) Dun

    #14 · Apr · Hatch

  • May · 11:00-16:00Mayfly (Ephemera danica) Dun and spinner

    #10-12 · May · Hatch

  • Jun · 19:00-22:00Blue-Winged Olive (Serratella ignita) Dun at dusk

    #16-18 · Jun · Hatch

  • Jul · 19:00-21:30Pale Watery (Procloeon pennulatum) Dun

    #18 · Jul · Hatch

  • Aug · 20:00-22:30Sedge caddis (various) Adult, evening

    #14-18 · Aug · Hatch

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

    #18 · Sep · Hatch

Matched fly box

PatternImitatesSizeTechnique
Grannom SedgeBrachycentrus adult#14April: fish it wet, swung downstream and allowed to rise at the end.
Mayfly SpinnerEphemera danica spinner#10The 'duck fly' fall at dusk; the fish take them spent and flat on the surface.
Sherry SpinnerSerratella spinner#16-18Evening fall in the weed lanes; watch for a single quiet sip.
Pheasant Tail NymphOlive nymph#16-18Upstream nymph through the carriers when nothing is rising.
Sawyer's Killer BugFreshwater shrimp (Gammarus)#12-14A Test original; fish it dead-drift close to the weed.

The river

The Test is a chalk stream: it rises from a spring near Overton, runs 64 km to Southampton Water, and maintains a temperature between 8 and 14°C all year. That constancy grows enormous weed beds, huge hatches of mayfly and olives, and brown trout that have been educated by 150 years of fly fishers. Almost all of it is privately owned; fishing is by day ticket on a handful of beats or by club membership, and the etiquette is formal.

On this river

Approaching a chalk stream

You can see the fish, which means they can see you. Kneel, keep behind the weed, and never let your shadow cross the water. On the Test the accepted approach is to wait for a specific fish to resume rising, then make one cast from a kneeling position ten metres below it.

The upstream nymph

When nothing is hatching, chalk-stream fish still feed on nymphs in the weed lanes. Fish a single small Pheasant Tail upstream on a 5-metre leader with a slack-line cast, and watch the point where the tippet enters the water rather than the fly. Takes are a small hesitation, often no more than the leader stopping for a beat.

Mayfly fortnight

Ephemera danica hatches for about two weeks from the middle of May and it is the one time when the Test's trout lose their caution. Fish a #10 dun during the afternoon and return for the spinner fall at dusk. Because the fish are feeding hard, a slightly imperfect cast is forgiven during this fortnight in a way it never is in July.

Licence and rules

An Environment Agency rod licence is required for anyone 13 and older, and it is separate from the day ticket — you need both. Day tickets on the Test run from a handful of beats and typically include a rod-share arrangement; most beats limit the number of rods and require a booking days in advance. Brown trout are catch-and-release on nearly all beats; a limited grayling harvest is allowed in winter on some.
When should I come?

The best months are Apr · May · Jun · Sep. Brown trout from 3 April to 30 September; grayling over the winter on some beats

What licence do I need?

An Environment Agency rod licence is required for anyone 13 and older, and it is separate from the day ticket — you need both. Day tickets on the Test run from a handful of beats and typically include a rod-share arrangement; most beats limit the number of rods and require a booking days in advance. Brown trout are catch-and-release on nearly all beats; a limited grayling harvest is allowed in winter on some.

How does the water behave?

Chalk streams rise from the ground, not from the sky, so the Test's flow responds to rainfall over a period of weeks rather than days. A wet winter gives strong, cool summer flows; a dry one leaves the river low, warm and weedy by August, and the beats may close early on welfare grounds. Check the Environment Agency gauge at Chilbolton if you want to know what you are walking into.

Related rivers