The Top Site is the area above the Chipper at the top of the river. This venue is ideal for rescue training or coaching and can be hired per person or you can hire the whole site. When the Top Site isn't booked by groups, you can paddle the section of the river. You can check whether the Top Site is open on our water information here. If you're interested in making a booking for the Top Site, see here for more information.


There are occasions when certain sections of the river are closed for recreational paddling if there are events or competitions on, you can check when these are on our events calendar here. If you're interested in organising an event or competition, please contact the centre on 01678 521083 to discuss your requirements.  


The Afon Tryweryn is split in to 2 sections, the Upper River and the Lower River. The Upper River is roughly 2km of grade 3-4 rapids and runs alongside the centre. The Lower section begins below the centre alongside Tyn Cornel campsite and continues with grade 2-3 rapids 6km down to Bala car park. There is one grade 4 rapid near the end of this section which is easily portaged using the leat; please ask for details in reception if you wish to use this or look out for the leat signs river right before Bala Mill Falls.

Please be aware that the Lower Tryweryn has many tributaries feeding into it, so after heavy rainfall the water level can dramatically increase and is therefore much more challenging than normal. The Upper Tryweryn isn't really affected by heavy rainfall due to the dam, so is often the better option for those trying to avoid paddling rivers in spate! 

River Map



We do our best to ensure the Upper and Lower Tryweryn are free of obstructions, however it is a natural environment so please be aware of any dangers and let the centre know if you spot any new obstructions. When you sign in at reception please check the water information board for details of any known hazards.


Please follow this link to more information on invasive non-native species and how you can help the National White Water Centre and the North Wales Wildlife Trust to prevent the spread of invasive species.


The Afon Tryweryn is a dam released river. This means that when there is a water release we nearly always have enough water for you to paddle on! Water releases from Llyn Celyn are controlled by Natural Resources Wales. There are a number of factors taken into consideration for water releases including, recreation, fisheries, power generation, flood control and water extraction. The National White Water Centre has an excellent relationship with Natural Resources Wales but we do not have any control over water releases. NRW advise us of the water release schedule and we update our water information points ( Facebook , Twitterwebsite and  phoneline 01678 520826) as soon as we find out.

To avoid environmental damage there are a couple of release restrictions in place:

No canoeing/kayaking below 7 cumecs
No rafting below 9 cumecs

The river grade does vary depending on the amount of water being released from the reservoir. Below is a table of the effect of water levels on the 2 sections of river. In heavy rainfall the Lower River levels can rise dramatically (though this has no effect on the Upper River), please check with reception before setting off along the river.


Release (cumecs) Upper section Lower section
7 3

grade 2 – 3

(with one grade 4 rapid)

7.5 – 10 3 / 4

grade 2 – 3

(with one grade 4 rapid)

10 – 16 3+ / 4

grade 2 – 3

(with one grade 4 rapid)

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