Activity on ice-covered waterways in and around Calgary is being discouraged by the Calgary fire department.

Firefighters responded to a number of calls on the Bow and Elbow rivers and the Glenmore Reservoir over the past number of days, the fire department said.

Acting battalion Chief Al Zeller said activity on the waterways is not recommended.

“The waterways are simply too dangerous at this point to be used for any recreational activities,” he said.

The fire department said that with warmer temperatures, people head out to the waterways for several different activities — but even though the city had a deep freeze last week, it may not have been enough to secure a solid ice surface.

The fire department said drastic temperature changes and quick flow rates in the rivers have created “weak and unpredictable” ice formations.

The fire department also said that even though some small local lakes seem solid, they have tested several areas and have determined the surfaces unsafe.