Overview of the Trail Network
The MacRitchie trail system sits within the Central Catchment Nature Reserve, bounded roughly by the Pan Island Expressway to the south, Thomson Road to the west and Upper Thomson Road to the north. The reservoir itself is a fresh water impoundment managed by PUB, and the surrounding green belt — maintained by NParks — contains approximately 11 kilometres of marked trail routes that can be combined into loops of varying length and difficulty.
The trail surface shifts between packed laterite, root-covered forest floor and occasional boardwalk sections near the water's edge. After heavy rain, the laterite sections hold up reasonably well but the root-dense stretches can become slippery. Most regular trail users switch to shoes with moderate grip between November and January when rainfall peaks, returning to road shoes during the drier months.
The Central Catchment Nature Reserve covers approximately 2,800 hectares and is one of the last remaining patches of primary and secondary tropical forest in Singapore. MacRitchie is the main access point for recreational use, though the reserve also connects to the Bukit Timah Nature Reserve corridor to the south.
Entry Points
There are four primary entry points to the MacRitchie trail network. Each has its own character and access considerations:
MacRitchie Reservoir Park (Thomson Road entrance)
The main entry. The car park off Venus Drive Road is the most commonly used starting point and is accessible by bus along Thomson Road. From here, runners can access the Reservoir Boardwalk, the Venus Loop and the connector to the HSBC Treetop Walk. Toilets and water points are available at the park office near the entrance. This entrance gets the most foot traffic on weekends — arriving before 7am for a long run is advisable.
MacRitchie via Upper Pierce Reservoir
A quieter access route that connects the Upper Pierce corridor to MacRitchie through a forested connector. Less documented on consumer running apps but useful for runners constructing longer point-to-point routes. The terrain here is more undulating than the Thomson entrance loop.
Treetop Walk (HSBC Treetop Walk)
The 250-metre suspension bridge spanning the forest canopy is one of the trail's signature features. Access is via a one-way system, and the bridge has specific operating hours (9am–5pm on weekdays, 8:30am–5pm on weekends, closed Mondays). On busy days, a queue of 20–30 minutes forms at the bridge. Runners doing a timed circuit will find the queue frustrating — the bridge is better treated as an exploration segment rather than a race checkpoint.
Loop Profiles and Distance Reference
The most commonly run configuration is the full reservoir loop, approximately 11km, which combines the boardwalk section, the inland forest path and the connector back to the main entrance. Elevation gain on this loop is modest — around 80 to 100 metres total — concentrated in two short climbs between the 3km and 6km marks.
Shorter options include the Venus Drive out-and-back (roughly 5km round trip from the main entrance) and the Lornie Trail, which runs along the reservoir's southern edge for about 4km before connecting to the Lower Pierce corridor. The Lornie Trail is drier and more shaded than the main loop and sees lighter traffic on weekdays.
NParks publishes a trail map at the main entrance and on the NParks website. The digital version is more current than the printed boards, which are not always updated after trail modifications.
Trail Conditions by Season
Singapore's two monsoon periods affect trail conditions at MacRitchie noticeably. The northeast monsoon (November to January) brings the heaviest sustained rainfall, and sections of the main loop near the 7km mark develop standing water that can persist for several days after a heavy event. NParks sometimes closes specific segments temporarily after storms — the closure notices appear on their Facebook page before the main website is updated.
The inter-monsoon periods in April-May and October are generally the best conditions for trail running: drier surfaces, lower humidity than June-August and less leaf litter from the drier months of February-March. The February-March period sees the most fallen dry leaves on the forest floor, which can obscure roots — something to account for foot placement.
Wildlife Encounters
Long-tailed macaques are present throughout the reserve and are occasionally seen on or near the trail. NParks advises against feeding them and against direct eye contact during encounters. Larger primate groups tend to move through the trail areas during mid-morning — roughly 9am to 11am — so early morning runners rarely have significant encounters. Monitor lizards (water monitors) are common near the reservoir edge and are generally indifferent to human presence.
Practical Notes
There are no convenience stores or cafes within the reserve. Runners doing the full loop in warmer conditions — which is most of the year — should carry at least 500ml of water. Hydration packs are common among the regular trail running crowd here. The water fountain at the Thomson entrance is the only reliably maintained refill point inside the park boundary.
Headlamps are required if arriving before sunrise, which is feasible from October through March when daylight starts later. Running the trails after the posted closing time (7pm) is not permitted and the gates at the main entrance are locked.