Stoneflies
Gammarids
It moves like it has somewhere to be but isn't in any hurry about it. This chalk stream is fed by deep groundwater and responds slowly to rain — typically forty-eight hours or more after a storm. The ranunculus streams in the current like green hair, and if you watch long enough — which is the whole point — you'll see a trout materialise where a moment ago there was only riverbed. It's the kind of water that makes you want to sit down and think about things for a while before you even string up the rod. Mayfly hatch arrives mid-May (the Duffer's Fortnight) and produces some of the finest dry-fly fishing in the world — fish rise everywhere for three weeks and then they're gone. Outside mayfly season, look for blue-winged olives (April–June and again in September), iron blues (March–May), and sedges (June–August). The fish are educated because they see flies daily; use small dry flies (size 16–18), fine tippet (5x or finer), and approach from downstream where they cannot see you approach. Nymph fishing works well between hatches with pheasant-tail and hare's-ear patterns. The lower reaches hold salmon; winter brings excellent grayling fishing. Access is via estate beats requiring advance booking.
The Test rises as a winterbourne near Ashe above Overton at roughly 90 m and drops only that much over 64 km to Southampton Water — an average gradient near 0.14%, about as gentle as an English trout river gets. Upper reaches above Whitchurch are seasonal: the spring line migrates downstream through the summer as the chalk aquifer draws down. From Whitchurch through Longparish, Chilbolton, Stockbridge, Mottisfont, Romsey and Broadlands the river runs as a classic low-gradient pool-riffle and glide sequence on clean, well-sorted flint gravel over Cretaceous chalk, threaded through a network of hand-cut carriers and side channels. Baseflow index at Broadlands is around 0.94, which is why the hydrograph is so flat and the bed so stable: Ranunculus anchors in the same gravel for years, and winter spates rarely shift it. Wading hazards are soft marl pockets and silty slacks at the margins, not anything mobile.
Wading: Soft marl pockets and silty margin slacks
- Chalk
- Unconfined
- Glide
- Pool riffle