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Passport scheme
Check the booking details below before you travel.
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Stillwater
150 acres, bank fishing only.
About Llwyn On Reservoir
Llwyn On is a 150 acre reservoir, the largest of the Taff reservoirs, and a favourite among local anglers. Fly, spinner and worm fishing are all permitted; Power Bait or anything similar is not. It is one of the Dŵr Cymru Welsh Water reservoirs sold through the Passport.
Rainbows are regularly stocked from Dŵr Cymru’s rearing unit. The Passport says the trout are larger than those caught at Beacons and Cantref, with a record rainbow of over 13lb and a best brown of 10lb 4oz. The reservoir is set in mixed woodland, and there are toilet facilities at the Mountain Centre. Opening hours are 8am until half an hour after sunset or 9pm, whichever is earlier.
All brown trout must be returned alive. It is one rod per angler for trout fishing, and anglers must stop when the catch limit is reached or buy another ticket at the fishery. The minimum size of fish taken is 12 inches, and lead weights from 0.06g (no. 8 shot) to 28.4g (1oz) are prohibited. A child of 13 or younger may fish free with a full fare (6 fish) paying adult, sharing that angler’s bag limit; this applies to one child only. It is booked through the Fishing Passport.
How to book
Day tickets and booking
- The Fishing Passport Day tickets
Day tickets
The beat page prints no ticket price on 2 November 2026; it mentions a full fare (6 fish) ticket and a junior ticket for under 16, so no fish ticket row is made. Booked through the Fishing Passport.
View fishing agent
Fishing details
- Water type
- Stillwater
- Size
- 150 acres
- Lake
- 1
- Boat fishing
- Bank only
Stocking and fish species
none stocking · Rainbows are regularly stocked from Dŵr Cymru’s rearing unit, per the Passport page.
Rules and policies
Fishing rules for Llwyn On Reservoir
Fly fishing, spinning and worm fishing only. Power Bait or anything similar is not permitted. One rod per angler for trout fishing. All brown trout must be returned alive. Stop fishing when the catch limit is reached or buy another ticket at the fishery. Minimum size of fish taken 12 inches. Lead weights from 0.06g (no. 8 shot) to 28.4g (1oz) are prohibited. National byelaws apply.
Where you'll fish
Location
Approximate locationExact location is hidden at the owner's request..
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FAQ
Llwyn On Reservoir FAQs
Practical questions anglers ask before fishing Llwyn On Reservoir, from tickets to tactics.
01How many rods are allowed on Llwyn On Reservoir at any one time?
02What species can I expect to catch on Llwyn On Reservoir?
03Do I need to wade, or can I fish from the bank?
04Is a ghillie available, and do I need one?
05Where do I park, and how do I access the beat?
06What tackle should I bring?
07What happens if conditions are poor on the day I've booked?
08Are dogs allowed on the beat?
Worth a read
Passport scheme
Ask when you book
