Architecture of the Calgary Tower

Architect: W. G. Milne — A. Dale and Associates.

Contractor: General - Poole Construction Co.;
Structural - Ricketts, Evers and Associates;
Electrical and Mechanical - Reid, Crowther and Partners Ltd.

Original cost: $3.5 million in 1968.

Original owners: Husky Oil Limited and Marathon Realty as part of the Palliser Square redevelopment.

Construction materials: Concrete and steel.

Original interior details: Full 360 degree panoramic views from restaurant and observation levels. Restaurant with revolving floor and seating for 200. First observation deck with capacity for 250 people. Second observation desk with cocktail lounge and snack bar. Skydomes in roof. Two steel encased staircases with 762 stairs from top to bottom. Two 25 passenger high speed elevators which travelled to the top in 62 seconds.

One unprecedented feature was the continual pour of concrete using a relatively new slip-forming construction technique. Pouring began May 15, 1967 and was completed 24 days later. The record pour in one 24-hour period was 39 feet.

The Tower was designed to withstand the elements (climate, high winds, shock, etc.). Although Calgary is not an earthquake zone, this structure was the first in the Western provinces designed to withstand earthquakes. On a windy day the Tower can, and will, sway up to 16.5 centimetres or 7.5 inches and can withstand winds up to 161 km/hr.

Tower Blueprints