Upper Seletar Reservoir, Singapore

Upper Seletar Reservoir is a freshwater reservoir located within the Central Water Catchment area of Singapore. It is one of the island’s oldest and most scenic reservoirs, bordered by lush tropical rainforest and surrounded by tranquil parkland. Originally known as the Seletar Reservoir, it was constructed in the 1920s and renamed Upper Seletar Reservoir in 1969, following the development of the Lower Seletar Reservoir downstream. The reservoir is managed by Singapore’s Public Utilities Board (PUB) and plays a key role in the nation’s water catchment system.

Quick Facts

History of Upper Seletar Reservoir

Construction of the original Seletar Reservoir began in 1920 to meet Singapore’s growing demand for freshwater. The site, situated in the upper reaches of the Seletar River, was chosen because of its undulating terrain and large catchment area. Upon completion, it became Singapore’s third impounding reservoir after MacRitchie Reservoir (1868) and Lower Peirce Reservoir (1912). The reservoir significantly expanded the island’s water storage capacity during the early 20th century.

By the 1960s, Singapore’s population had increased rapidly, necessitating further water supply expansion. In 1967, a new reservoir — Lower Seletar Reservoir — was created downstream. To differentiate between the two, the original reservoir was renamed Upper Seletar Reservoir in 1969.

That same year, the area around the reservoir was officially opened as a public park by then Prime Minister Lee Kuan Yew. The park featured walking paths, gardens, and the now-iconic rocket-shaped observation tower, symbolising Singapore’s aspirations for progress and modernity. This tower remains one of the most recognisable landmarks of the Upper Seletar Reservoir Park today.

Geography and Surroundings

Upper Seletar Reservoir lies within the northern section of the Central Water Catchment, bounded by Mandai Road to the south and the Seletar Expressway (SLE) to the north. Covering about 350 hectares, the reservoir sits amidst dense forest that forms part of the Central Catchment Nature Reserve, one of Singapore’s largest protected ecosystems.

The surrounding terrain is hilly and covered with rich tropical vegetation, providing a natural filter for rainwater runoff entering the reservoir. From its shores, visitors can enjoy panoramic views of the calm waters framed by rainforest — a popular spot for photographers and nature lovers. To the northwest lies the Mandai Wildlife Reserve, home to the Singapore Zoo, River Wonders, and Night Safari, all of which share the same ecological landscape as the reservoir.

Hydrology and Function

Upper Seletar Reservoir is part of the Seletar River catchment system. Rainwater and runoff from the surrounding forests are collected and channelled into the reservoir, where it is stored as raw water before being sent to treatment facilities. The reservoir’s spillway connects it to Lower Seletar Reservoir downstream, forming a two-tiered water management system that efficiently regulates flow and storage capacity.

The reservoir continues to play an active role in Singapore’s local water catchment strategy — one of the nation’s Four National Taps. While newer urban reservoirs like Marina Reservoir and Punggol Reservoir handle large urban catchments, Upper Seletar Reservoir remains a key component of the inland freshwater network, valued for its pristine environment and high water quality.

Upper Seletar Reservoir Park

The Upper Seletar Reservoir Park spans 15 hectares along the reservoir’s southern edge. Managed by the National Parks Board (NParks), the park offers an idyllic setting for relaxation, exercise, and family outings. Its open lawns, shaded picnic spots, and scenic walking paths make it a favourite weekend destination among residents of northern Singapore.

The park’s centrepiece is the Upper Seletar Tower, a 60-foot (approximately 18-metre) rocket-shaped observation tower built in the late 1960s. Visitors can climb to the top for sweeping views of the reservoir and surrounding forest canopy. At sunset, the tower area becomes particularly picturesque, with the sun reflecting off the water’s surface and flocks of birds returning to roost in the nearby trees.

Ecological Significance

Like its neighbouring reservoirs, Upper Seletar Reservoir is surrounded by secondary rainforest that supports a diverse array of flora and fauna. The area provides a habitat for many native species, including long-tailed macaques, monitor lizards, otters, and various bird species such as herons, eagles, and kingfishers. The surrounding forests are also home to unique plants and fungi, contributing to Singapore’s overall biodiversity.

The reservoir’s location within the Central Catchment Nature Reserve ensures strict environmental protection. Activities such as swimming, boating, or fishing are prohibited to safeguard water quality and minimise human disturbance. PUB and NParks collaborate on continuous water quality monitoring, habitat restoration, and biodiversity conservation projects in the area.

Engineering and Design

The construction of the Seletar (now Upper Seletar) Reservoir involved damming the Seletar River and creating an impoundment surrounded by rolling forested hills. The dam, built using earth and concrete, was designed to provide stability and long-term storage capacity. Over time, upgrades were carried out to strengthen the dam structure and improve its monitoring systems, ensuring compliance with modern engineering standards.

Although more than a century old, the reservoir’s design remains functional and efficient. Its integration with downstream Lower Seletar Reservoir allows for effective control of water flow and sedimentation, demonstrating the foresight of Singapore’s early water engineers in designing interconnected catchment systems.

Recreation and Tourism

Upper Seletar Reservoir is a popular spot for nature lovers, photographers, and cyclists. Visitors can enjoy leisurely strolls, picnics, and wildlife observation from various vantage points. The park is also part of the Round Island Route and Central Catchment Park Connector Network, linking it to nearby green spaces such as Lower Seletar Reservoir Park and MacRitchie Reservoir Park.

The reservoir’s scenic appeal has made it a favourite location for wedding photography and film shoots, particularly around the tower area and its majestic rain trees. Its serene atmosphere offers a striking contrast to the urban bustle of Singapore’s city centre, illustrating the nation’s success in integrating nature with urban living.

Role in Singapore’s Water Sustainability

As one of Singapore’s 17 freshwater reservoirs, Upper Seletar Reservoir remains an active contributor to the island’s water sustainability strategy. It forms part of PUB’s Local Catchment Water system — a key pillar of the Four National Taps — that harnesses rainwater through an extensive network of drains, canals, and reservoirs. The forest catchment surrounding Upper Seletar Reservoir acts as a natural filtration system, improving water quality before it enters the reservoir basin.

Beyond its hydrological function, the reservoir also serves as an educational and recreational resource, raising public awareness about the importance of water conservation and environmental protection. Its continued integration into Singapore’s urban ecosystem exemplifies the nation’s long-term vision of sustainable development.

Conclusion

Upper Seletar Reservoir stands as a living testament to Singapore’s century-long journey in water resource management. From its colonial-era beginnings to its present-day role in sustainability and recreation, it has evolved into one of the nation’s most beloved natural landmarks. Surrounded by rainforest, anchored by its iconic tower, and enriched by history, the reservoir continues to embody Singapore’s enduring balance between nature, heritage, and innovation.

Upper Seletar Reservoir is on the Map of Reservoirs in Singapore

References

  1. Public Utilities Board (PUB) – Singapore’s National Water Agency
  2. Singapore Infopedia – Upper Seletar Reservoir
  3. Wikipedia: Upper Seletar Reservoir
  4. National Parks Board (NParks)

Page Details

This page was created on 5 October 2025. Hi, my name is Timothy and created it from my research, for my own entertainment, knowledge and to satisfy my curiosity. I am providing the information to you in good faith and hope it is useful. I try to get the details as accurate as possible. I also try to update the page whenever I stumble on new details. So this and all my other pages are perpetual work in progress. If you discover any error, please politely inform me, pointing out where the error lies, and I will correct it as soon as possible. Your helpfulness will keep this page accurate, relevant and helpful to those who need the information.

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