Reef Indoor Water Park boasts that it is the largest indoor water park in the state of Montana. This park is located in Billings where residents and tourists can come to enjoy the various pools, water slides, and other adventure. There is even a 25 person hot tub located inside at the Reef. General admission prices are $16.95 for anyone over 48". Under 48" the cost is $14.95. Spectators who will not be participating in any water fun are $5. Hours of operation vary based on the season, but the park is open daily. Hours range from 9am or 10am in the morning with closures at 2pm, 7pm, or 9pm depending on the day. On the weekends the park tends to stay open longer.
The Barracuda Blaster Twist is one of the longer slides with a fast drop into a deep swimming pool. Only individuals over 48" tall are allowed on the slide. The other slide is Tropical Twister, which takes riders into another pool. There is an inner tube ridge with 3 foot waves. The waves come out every 10 minutes with 55,000 gallons in the wave pool. Another pool has a basketball ring attached for pool basketball.