Pasak Jolasid Dam

This section is being updated and will be available shortly.

Pasak Jolasid Dam, in Phatthana Nikhom district of eastern Lopburi, impounds the Pa Sak River to form one of Central Thailand's largest reservoirs. Completed in the late 1990s as a royal-initiative project, it is now a popular cool-season destination famous for the railway line that skims across the water.

The dam offers big-sky reservoir scenery rare in the Central Plains, breezy viewpoints along the crest, and the celebrated experience of riding a train that appears to float over the water. Combined with the nearby sunflower fields in bloom, it anchors one of Thailand's classic cool-season excursions.

Highlights include the long dam crest with panoramic water views, the seasonal tourist trains that pause on the causeway across the reservoir, a visitor area explaining the royal irrigation project, and sunset light over the lake. Local stalls selling grilled fish round out the day.

Ride or photograph the trains crossing the reservoir, stroll or take a tram service along the dam crest, visit the project's information displays, picnic at the waterside and eat freshwater fish at the local stalls. Cyclists enjoy the flat, scenic service roads in cool weather.

The train causeway over the water is the signature sight, best in the cool season when special excursion services run from Bangkok. The crest viewpoint over the vast reservoir and the memorial honouring the project's royal patronage are the other main stops.

Weekday visits outside festival weekends give you the crest views almost alone, and the fishing hamlets around the reservoir edge show a quieter waterside life. Sunset from the western end of the dam is consistently lovely and rarely crowded.

The dam is presented locally as a legacy of royal development work, and Thai visitors often treat the visit with a note of respect alongside the fun. Lakeside communities live from fishing and farming, and their markets and shrines reflect ordinary Central Thai rural culture.

The reservoir creates a big open-water landscape with waterbirds, breezes and wide horizons unusual for the region. Walking and cycling along the crest and service roads are easy, and the surrounding districts turn gold with sunflowers in the bloom months.

Families enjoy the tram rides along the dam, the novelty of trains crossing the water, and simple lakeside picnics; children should be watched near the water's edge and railway. The outing pairs well with flower fields and farm stalls for an easy full day.

There is no nightlife at the dam itself, and the nearby towns of Phatthana Nikhom and Chai Badan offer only quiet local restaurants and shops. Visitors wanting evening options should return to Lopburi town or Saraburi.

Photograph the excursion train from the shoreline as it crosses the causeway, shoot the reservoir panoramas from the crest, and stay for sunset over the water. In bloom season, compositions combining sunflowers with the lake and hills are the local classic.

The dam was built across the Pa Sak River during the 1990s as a project initiated by King Bhumibol Adulyadej to tame seasonal flooding and store irrigation water for the Central Plains, and it opened at the end of that decade. The railway to the northeast, which predates the reservoir, now crosses the water on an embanked causeway, creating the famous floating-train effect.

Local identity blends reverence for the royal project with a lakeside economy of fishing, farming and seasonal tourism. Community stalls, temple fairs in nearby villages and the cheerful cool-season crowds give the area an unpretentious Thai-holiday feel.

November to January is prime, when the weather is cool, the sunflowers bloom nearby and special excursion trains typically run. Weekdays are quieter than weekends, and late afternoon brings the best light over the water.

The cool season offers dry, breezy days ideal for the exposed crest, while the hot months from March to May can be harsh in the open. The rainy season, roughly June to October, fills the reservoir and greens the landscape but brings afternoon storms.

The headline event is the cool-season tourist-train program, when special services from Bangkok stop on the causeway over the water, typically on weekends between about November and January; schedules vary yearly. Local fairs and sunflower festivals in the surrounding districts follow the same season.

Combine morning sunflower fields at Khao Chin Lae with a late-morning arrival at the dam, lunch on grilled fish at the stalls, an afternoon exploring the crest viewpoints, and, if timed right, watching the excursion train cross the water before heading back to Lopburi town.

Two to three hours suits a straightforward visit, while a half day allows the tram, viewpoints, a leisurely fish lunch and train-watching. Combining the dam with the flower fields fills a comfortable full day.

The dam lies roughly 60 kilometres east of Lopburi town, reached by car via Phatthana Nikhom or by train to Khok Salung station near the reservoir. In the cool season, special excursion trains from Bangkok serve the dam directly; otherwise arrange a car or driver.

A vehicle is the practical way to cover the dam area, its viewpoints and the surrounding fields, though a local tram service often shuttles visitors along the crest itself. Cyclists find the flat lakeside roads rewarding in cool weather.

Khok Salung railway station, on the line that crosses the reservoir, is the closest rail point, with Lopburi town as the main regional hub for buses and trains. From local stations, pre-arranged pickups or taxis cover the final stretch.

The public areas of the dam are generally open during daylight hours, with the tram and information services operating in the daytime, busiest on cool-season weekends. Hours for trams and trains vary seasonally, so check locally before planning around them.

Access to the dam area is typically free or very cheap, with small charges possible for the crest tram and parking. Excursion-train tickets from Bangkok are sold separately by the railway and are popular, so book ahead in season.

Stalls and simple restaurants near the dam serve grilled and spicy freshwater fish, som tam and noodle dishes, especially on weekends. The towns of Phatthana Nikhom and Chai Badan add everyday Thai restaurants and markets.

Reservoir fish is the speciality, grilled with salt crust or cooked into spicy soups and salads, alongside standard Central Thai fare. In bloom season, sunflower seeds and honey from surrounding farms are the take-home treats.

A scattering of resorts, homestays and camping-style stays operates around the reservoir and Phatthana Nikhom, while Lopburi town offers the widest choice of guesthouses and hotels about an hour away. Cool-season weekends justify booking ahead.

Costs are modest: free or cheap dam access, inexpensive food stalls and reasonable transport. The main expenses are vehicle hire for the day and, if chosen, the excursion-train ticket from Bangkok.

Vendors near the dam sell dried and grilled fish, local produce, sunflower products in season and simple souvenirs. There is no formal shopping beyond markets in the nearby district towns.

Keep well clear of the railway causeway except at sanctioned viewing times, supervise children near open water, and mind strong sun on the exposed crest. Swimming in the reservoir is not a managed activity and is best avoided.

The crest road and main viewpoints are flat and vehicle-accessible, making the core views manageable for visitors with limited mobility, especially using the tram service. Paths to shoreline stalls can be rough or sandy in places.

English is limited in this rural district, so simple Thai phrases and a translation app help; the dam's Thai name is pronounced roughly Khuean Pa Sak Chonlasit. A polite wai and patience go a long way at stalls and stations.

Time your visit for the cool season if you want the floating-train experience, verify current train schedules before committing, and pair the dam with the sunflower fields for the classic Lopburi day out. Late afternoon light flatters the water best.

Bring sun protection, water, a hat and a windbreaker for the exposed crest, plus a camera with a zoom for train shots across the water. Cash in small notes covers stalls, trams and parking.

Take litter home, respect fishing communities' nets and moorings along the shore, and buy food and produce from local stalls. Keeping to marked visitor areas protects both the infrastructure and the lakeside habitats.

The Khao Chin Lae and Phatthana Nikhom sunflower fields, Ang Sub Lek Reservoir and Wat Khao Wong Phra Chan lie within easy reach, and Lopburi's old-town monuments are about an hour west. Saraburi's sights sit conveniently along the route back toward Bangkok.

The dam is operated by Thailand's Royal Irrigation Department, which maintains the public visitor areas, while the State Railway of Thailand runs the seasonal excursion trains. The Tourism Authority of Thailand office covering Lopburi posts each season's schedules and events.

This section is being updated and will be available shortly.

This section is being updated and will be available shortly.