Many tourists and Chicagoans visit the fountain each year. The fountain operates daily 8:00 a.m. to 11:00 p.m. from mid-April through mid-October. Water shows occur every hour on-the-hour and last 20 minutes. During shows, the center jet shoots up vertically to 150 feet (46 m), and after dusk shows are choreographed with lights and music. The last show begins at 10:00 p.m. nightly.
The fountain is constructed of Georgia pink marble and contains 1,500,000 U.S. gallons (5,700,000 l) of water. During a display, more than 14,000 U.S. gallons per minute (0.88 m3/s) are pushed through its 193 jets. The bottom pool of the fountain is 280 ft (85 m) in diameter, the lower basin is 103 ft (31 m), the middle basin is 60 ft (18 m) and the upper basin is 24 ft (7.3 m). The lip of the upper basin is 25 ft (7.6 m) above the water in the lower basin.
According to wikipedia
