Start with Olive Damsel (8-12) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and change drift line before you change food group.
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
A reasonable day here, though cloud isn't quite in the sweet spot.
615-acre reservoir in the upper Severn headwaters near Llanidloes. Deep upland water with excellent wild brown trout and stocked rainbows. Boat and bank fishing. Strong competition pedigree. Dramatic scenery with steep valley sides. Good buzzer and sedge hatches.
NRW WFD Cycle 3 (lake) — Llyn Clywedog: Moderate ecological status. Re-tagged 2026-06-18 from an inflow-river reach to the reservoir's own lake waterbody. Source: NRW DataMapWales WFD Cycle 3 classification layer.
NRW (Wales) · GB30937446
Llyn Clywedog dam and reservoir
Timevans500 - CC BY-SA 4.0
615-acre reservoir in the upper Severn headwaters near Llanidloes.
Start with Olive Damsel (8-12) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and change drift line before you change food group.
Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.
Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
A reasonable day here, though cloud isn't quite in the sweet spot.
615-acre reservoir in the upper Severn headwaters near Llanidloes. Deep upland water with excellent wild brown trout and stocked rainbows. Boat and bank fishing. Strong competition pedigree. Dramatic scenery with steep valley sides. Good buzzer and sedge hatches.
NRW WFD Cycle 3 (lake) — Llyn Clywedog: Moderate ecological status. Re-tagged 2026-06-18 from an inflow-river reach to the reservoir's own lake waterbody. Source: NRW DataMapWales WFD Cycle 3 classification layer.
NRW (Wales) · GB30937446