The river Tryweryn is a wild brown trout river. Grayling are present on the lower
reaches. Migrating salmon are present as are minnows, loaches and bullheads.
Rules for the Tryweryn: no spinning at any time. Fly and worm only, Maggots and
ground baiting not permitted – NRW bye-law
The river is subject to a rapid rise in level due to water releases from Llyn Celyn.
Please be aware of this. Details of water releases can be found on the White Water
rafting site here.
NRW gauges are here. PDF file giving instructions is here. As a guide low levels
are about 0.5 to 0.6M. 0.8M-1.0M is nice water. Above the1.5M river is getting high.
The river is used extensively for canoeing and rafting and will be busy at weekends.