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Tallest bell-mouth spillway

Tallest bell-mouth spillway
Who
Hungry Horse Dam
Where
United States (Columbia Falls,)
When
1953
The bell-mouth (also known as a glory hole or plug-hole) spillway at the Hungry Horse Dam, Columbia Falls, Montana, USA, is 171.9 m (564 ft) tall, with water dropping 149.35 m (490 ft) at a capacity of 1,416 m³ per second (50,000 ft³ per second). The spillway is controlled by a 20-m-by-3.7-m (64-ft-by-12-foot) ring gate. It was constructed between 1948 and 1953.