Lost Lagoon

After a century of infilling and separation from tidal waters, the lagoon now experiences persistent algae blooms, stagnant water, and shallow depths often under one meter.

Early concept designs envision renewed tidal wetlands similar to the lagoon’s historic salt-marsh environment, enhancing conditions for fish, birds, and other wildlife.

This planning will also involve coordinating with the broader Stanley Park Comprehensive Plan.

After a century of infilling, Lost Lagoon has experienced a growing bloom of algae, worsening water quality and harming its aquatic and plant life. A bathymetric survey in 2018 revealed that most of the lagoon is now less than 1 metre deep. 

Algae blooms occur when algae grows quickly and forms a dense mass. They typically occur in summer and fall due to a combination of warm water, high nutrients, sunlight, and calm weather. Runoff from roads and other human activities can make algae blooms more likely.

While algae occurs naturally and is a part of the marine ecosystem, rapid increases in algae can be harmful for animals and plants by blocking sunlight and using up oxygen in the water. Most types of algae are not toxic, although it is best not to touch it.

A visit to the Lost Lagoon Nature House (located on the south-east shore of the lagoon and operated by the Stanley Park Ecology Society) will provide information on the park's rich flora and fauna and social history.

For hours of operation, visit the Stanley Park Ecology Society website External website, opens in new tab.

Lost Lagoon was for centuries used for shellfish harvesting. The settlement and cultural uses were displaced with the creation of Stanley Park in 1888.

Following the completion of the Stanley Park Causeway, subsequent decades saw the tidal ecosystem transformed into a captive pond for recreational and aesthetic purposes, including pleasure boating and fish stocking.

The modern name for Lost Lagoon comes from a poem written by Pauline Johnson, a writer and performer of Indigenous heritage who wrote of life in Canada in the 19th century. Johnson once said: "When I first plied paddle across the gunwale of a light canoe and idled about the margin, I named the sheltered little cove Lost Lagoon. This was just to please my own fancy for, as that perfect summer month drifted on, the ever restless tides left the harbor devoid of any water at my favorite canoeing hour and my pet idling place was lost for many days; hence my fancy to call it Lost Lagoon.”