The City of Lethbridge is urging everyone to stay away from the Oldman River after heavy rain pushed the water to dangerous levels. On July 1, 2026, the river hit a flow rate of 900 cubic metres per second, which is roughly four times the usual flow for this time of year.
Because of the safety risk, the city closed the gates at four popular river valley parks: Pavan Park, Popson Park, Alexander Wilderness Park, and Cottonwood Park. The closures are in place until further notice.
Normal flow for the Oldman River in early July is between 200 and 250 cubic metres per second. The current reading of 900 m³/s even tops the 746 m³/s peak seen in early June. Officials warn that the water is extremely fast and the riverbanks are soft and unstable after weeks of wet weather.
Lethbridge has had a remarkably wet spring and early summer. Around 160 millimetres of rain fell between May 28 and June 2, according to Environment Canada, leaving the ground soaked so new rain runs straight into the river. The Oldman River drains a huge watershed that reaches back into the Rockies, so rain falling near Crowsnest Pass or Castle River can arrive in Lethbridge hours later.
The City of Lethbridge says there is no current flood threat to homes or buildings. The treatment plants for drinking water and wastewater are managing the high silt levels, and voluntary water conservation measures are still in place. Still, residents are being asked to keep a safe distance from the water. Alberta’s River Forecast Centre has High Streamflow Advisories for the entire Oldman River Basin, including nearby rivers and creeks.
City officials stress that conditions can change quickly. While the flow is far below the 3,320 m³/s threshold for a major flood, the water is powerful enough to sweep someone off their feet. Anyone planning outdoor activities on Canada Day is asked to pick a spot well away from the river.
