Visitors to Lake Annand in South Toowoomba have been surprised to find the popular lake completely dry, but local authorities say the unusual sight is part of a planned infrastructure project rather than the result of drought.

The lake has been deliberately drained to allow construction crews to safely complete the Perth Street culvert upgrade, a major flood mitigation project being delivered by the Toowoomba Regional Council with support from the Australian Government. The ageing culvert beneath Perth Street is being replaced with a larger, modern structure capable of handling heavier rainfall and reducing flood risks during severe weather events.

Lake Annand plays an important role in Toowoomba's stormwater system, acting as both a recreational lake and a detention basin that helps manage floodwaters flowing through East Creek. Because the construction work is taking place beneath and around the waterway, the lake needed to be emptied to provide workers with safe access to the site and to minimise environmental impacts during excavation. Environmental management measures were also implemented to protect aquatic wildlife before the water was removed.

The infrastructure upgrade is expected to significantly improve the area's resilience during future storms. The new culvert has been designed with greater water-carrying capacity, helping reduce the likelihood of flooding along Perth Street and nearby residential areas. Council says the project will also improve road reliability and public safety during extreme weather events, which have increasingly affected the Toowoomba region in recent years.

Construction began earlier this year but experienced delays after workers uncovered timber believed to have potential historical significance during excavation beneath the lake. Work was temporarily paused while archaeologists and the Queensland Department of Environment investigated the discovery. The site was secured during the assessment before preparations were made for construction to continue.

Although the empty lake has disappointed many residents who regularly use the park for walking, picnics and birdwatching, council has assured the community that Lake Annand Park remains open. Some walking paths and sections near the construction zone are temporarily closed, while pedestrian detours and traffic changes have been introduced to keep the public safe. Motorists are also being asked to follow signed detours around the work area.

The project is expected to continue through 2026, with completion targeted for December, subject to weather conditions and the progress of construction. Once the work is finished, the lake will be refilled and restored as part of the project, allowing residents to once again enjoy one of South Toowoomba's most popular green spaces.

Council has acknowledged the temporary inconvenience but says the long-term benefits will outweigh the disruption. By upgrading critical drainage infrastructure now, the project aims to better protect homes, roads and public assets from future flooding while ensuring Lake Annand continues serving both its recreational and stormwater management functions for many years to come.