
1) Roller coaster in Colorado
Found on
https://www.crosswordclues.com/clue/half-pipe

A half-pipe is a structure used in gravity extreme sports such as snowboarding, skateboarding, skiing, freestyle BMX, and skating. The structure is wood, concrete, metal, earth, or snow. It resembles a cross section of a swimming pool, essentially two concave ramps (or quarter-pipes), topped by copings and decks, facing each other across a flat tr...
Found on
http://en.wikipedia.org/wiki/Half-pipe
[roller coaster] Half Pipe is a steel launched shuttle roller coaster located at both Elitch Gardens in Denver, Colorado and at Särkänniemi in Tampere, Finland. The structure is 100 feet in height and consists of 230 feet of track. The ride is currently one of two rides of its type offered in the United States (the other being Avatar Airb...
Found on
http://en.wikipedia.org/wiki/Half_Pipe_(roller_coaster)

Two snow ramps facing each other that shape the letter U.
Found on
http://www.allstaractivities.com/sports/snowboarding/Snowboarding-terminolo

a U-shaped ramp of any size, usually with a flat section in the middle.
Found on
http://www.encyclo.co.uk/local/21306

a U-shaped ramp of any size, usually with a flat section in the middle
Found on
http://www.exploratorium.edu/skateboarding/largeglossary.html

A frozen U-shaped structure used in freestyle skiing and snowboarding for aerial tricks.
Found on
https://snowslang.com/glossary/

A structure that resembles a cross section of a swimming pool and is used in skiing, skating and other gravity sports to perform tricks.
Found on
https://www.encyclo.co.uk/local/22295

A U-shaped trench with walls of the same height and size on both sides. Used for performing freestyle tricks.
Found on
https://www.rei.com/learn/expert-advice/snowboarding-glossary.html

Snow half-pipe, one of the areas where freestylers can express themselves with jumps and tricks. An half-pipe is a huge snowy structure that has the shape of half a tube, snowboarders ride inside the pipe up towards the walls and upwards.
Found on
https://www.wedze.co.uk/snowboarding-glossary
No exact match found.