Gateway Geyser is a man-made geyser located in Gateway Arch National Park in St. Louis, Missouri. It was constructed in 2002 and is designed to shoot water up to 630 feet into the air, making it one of the tallest fountains in the United States. The geyser is situated near the Mississippi River and offers a unique view of the iconic Gateway Arch. The geyser operates daily, with scheduled eruptions that attract both locals and tourists. It uses a combination of water and compressed air to create its impressive display. The surrounding park area provides a scenic backdrop for visitors to enjoy the spectacle.