🔄 Updated 21 Jun 2026
If you're driving through Chai Nat and have time to stop somewhere, the Chao Phraya Dam is usually the first place locals will point you to. It sits on the Chao Phraya River at the Bang Krabian bend, in Bang Luang sub-district of Sapphaya, about 6 km south of Chai Nat town — under ten minutes by car. There's no entry fee, you can wander around all day, and there's more to do here than you'd expect.
Thailand's first diversion dam — why it matters
The Chao Phraya Dam was the first large diversion dam in Thailand. The structure is reinforced concrete, roughly 237.50 m long and about 16.5 m high. King Bhumibol Adulyadej the Great and Queen Sirikit presided over the opening ceremony on 7 February 1957. Unlike a hydropower dam that holds water in a big reservoir, this one raises the river level and diverts the flow into canals that feed the rice fields across the central plains on both banks.
Put simply, a huge share of the rice grown on the central plains gets its water from a system that begins right here. Standing on the crest of the dam and watching the river pour through the gates, you start to understand why this is called the starting point of modern irrigation in Thailand.
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The 16 floodgates — the spot everyone comes to watch
The standout feature you'll remember is the row of floodgates: curved steel gates about 7.50 m high, 16 of them in a line, each bay around 12.50 m wide. During the flood season, when several bays are opened at once, the grey, silty water surges over the spillway in a long sheet with a thunderous roar — a sight a lot of people come to see at the end of the rainy season especially.
- Walk the dam crest — a long walkway runs across the river, giving you a full view of every gate and the water rushing below.
- Photo angles — the long line of gates makes a dramatic backdrop, particularly in the late-afternoon side light.
- Flood season — late rainy season into early cool season (September–November) is when the spillway gates are opened most, and the rushing water looks its best.
Tip
If you want to see water pouring hard through the gates, come during the high-water period at the end of the rainy season. In the dry season the flow is low and most gates are closed — the view is calmer, but it's still a pleasant walk.
Feed the fish below the dam — the kids' favourite
The downstream side below the dam is a gathering point for big Chao Phraya River fish. With people feeding them regularly, the schools pack in thick. Vendors sell bread and bags of fish food nearby — toss a handful in and the fish thrash at it until the water seems to boil. It's a simple activity the kids love, and the grown-ups end up enjoying it too.
Because there are so many fish below the dam, this area has a lively fish market where local fishers bring their river catch to sell — striped catfish (pla khang), giant featherback (pla krai), giant gourami (pla raet), and other big freshwater fish. Many stalls supply restaurants, so if you like fresh river fish it's a fun stop, and prices are often better than in town.
Buy fish food on the spot
No need to bring your own — right at the feeding spot, vendors sell bread and bags of fish food for just a few tens of THB. Easy to grab, and a bag lasts a good while.
Relax by the river in the evening and watch the sunset
The Chao Phraya Dam is at its nicest from late afternoon into the evening, when the sun softens and a cool breeze comes off the river. Locals come to sit by the water, some to exercise or stroll along the walkway, others bringing snacks for a picnic in the breeze. As the sun drops, the sky over the river turns golden-orange and reflects off the surface — which is why this is a go-to sunset spot for people in Chai Nat.
Walk the bridge in the breeze
A long walkway across the river — great air in the evening, with views down both banks as you go.
Sunset angle
In the evening the sky over the river turns golden-orange — a popular photo spot.
Riverside picnic
Bring snacks and sit in the breeze, or buy from the shops near the dam.
What to eat around the dam
Around the dam and along the Chao Phraya River you'll find plenty of riverside restaurants and cafes. The standout is the fresh river fish you can get right here — blanched striped catfish with dipping sauce, fish tom yum, grilled fish, fried fish, all with a river view. Coffee lovers have riverside cafes for an evening sip with the sunset.
- Chao Phraya riverside restaurants — fresh river fish like striped catfish and giant featherback, paired with river views and a relaxed vibe.
- Riverside cafes — Sapphaya has several cafes along the river, good for an evening coffee in the cool breeze.
- Fish market below the dam — buy fresh river fish to take home, or just soak up the busy fishing-market atmosphere.
Where to head next around the dam
One nice thing about the Chao Phraya Dam is that it's close to several of Chai Nat's top attractions, so it's easy to string together a one-day trip.
Chai Nat Bird Park
A huge aviary at the foot of Khao Phlong — walk among many species of birds, great for kids.
Wat Thammamun Worawihan
An old temple on Khao Thammamun by the Chao Phraya River, home to Luang Pho Thammachak, a revered local Buddha image.
Khao Phlong
A viewpoint and hilltop temple not far from the dam — an easy add-on in the same trip.
How to plan a half-day at Chao Phraya Dam
Chao Phraya Dam + sunset
Getting there and the best time to go
- From Chai Nat town — head south toward Sapphaya district about 6 km; signs are clear, the drive is easy, and there's parking.
- Opening hours — the area around the dam is open for strolling all day; the best time is late afternoon into evening to avoid the heat and catch the sunset.
- Best season for the water — late rainy season (September–November) is when the spillway gates open most, so you'll see the water rushing.
Chao Phraya Dam commemoration fair
In early February there's often a Chao Phraya Dam commemoration fair, marking the anniversary of the dam's opening, with exhibitions, food, and riverside activities. If you can plan your visit around then, you'll catch an especially lively atmosphere.
Plan a full day in Chai Nat
See the Chai Nat travel guide →