Nam Chun Reservoir

Nam Chun Reservoir is a working irrigation dam in Chun district, built as a royal-initiated project under King Bhumibol Adulyadej and completed by the Royal Irrigation Department in 1989. The earthen dam wall stands 23 metres high and runs 385 metres across the valley, holding back roughly 9.6 million cubic metres of water — enough to keep Chun’s rice paddies watered through the dry season and stop the surrounding villages flooding when the rains are heavy.

This isn’t a manicured lakeside park. There’s no ticket booth, no restaurant row, and no pier of longtail boats for hire — just a stretch of water framed by low hills, used daily for irrigation and by local anglers after the freshwater fish the reservoir was partly built to breed. If you’ve already done the boardwalk-and-restaurant scene at Kwan Phayao — Phayao’s much larger, much busier lake roughly 30km southwest — this is the opposite experience: a functional dam most travellers will never hear about.

Insider Tip: This is Irrigation Department infrastructure, not a tourism site, so there are no vendor stalls or rental gear on hand. Locals fish here with their own rod and line — bring tackle if that’s the draw, because nothing is available to rent on-site.

Facilities are minimal to non-existent beyond the dam structure itself — no confirmed shop, toilet block, or marked walking trail — so this suits travellers who want a genuine off-the-record stop rather than a full afternoon out. Watch out: the reservoir sits well off the main Phayao–Chiang Rai road; a rental car or motorbike is the only realistic way to reach it, and Thai-language signage is limited once you leave the highway.

Entry is free — there’s no gate to pay at, since this is irrigation infrastructure rather than a paid attraction. Visit early morning or late afternoon to avoid the flat midday light and the day’s heat; the dry season (November–February) gives the most comfortable temperatures and the clearest water. If you’re touring Phayao beyond the lake, pair it with Kwan Phayao for the contrast, or Pang Kha Royal Project and Development Centre for another royally-initiated site in the province.