Growth in the Prairie Island Indian Community was shown with the opening of a community center, health care facility as well as improvement to tribal water and sewer systems. Not long after, in 1992, the casino was expanded by an additional 25,000 square feet. In 1991, the 30,000-square-foot building was expanded with a 25,000-square-foot addition that created room for additional games.

Shortly after 1989, Prairie Island Indian Community signed a compact with the State of Minnesota which allowed it to expand its gaming operation. This act contributed to much tribal success for the Prairie Island Indian Community. This act required states to negotiate gaming compacts with the Tribe as a way to strengthen tribal governments and improve the quality of life on reservations. Through its time of success it began to grow further into Treasure Island after Congress passed the Indian Gaming Regulatory Act of 1988. This building started as a 30,000-square-foot space that seated 1,400 people. Treasure Island Resort & Casino began as a bingo hall in 1984 called Island Bingo. Employing nearly 1,500 people, Treasure Island Resort & Casino is the largest employer in Goodhue County.

Additional amenities to the property include a 788-room hotel (2nd-largest in Minnesota), the Treasure Island Amphitheater (outdoors - 16,000 capacity), the Island Event Center (indoors - 2,800 capacity), a marina, RV-park, a cruise yacht, an indoor waterpark, a spa, a 24-lane bowling center and arcade, and several restaurants. The casino’s gaming options include slot machines video roulette, blackjack and keno live dealer blackjack, poker and other table games and bingo. It is the only casino resort in southern Minnesota located on the Mississippi River. Treasure Island Resort & Casino is a tribal gaming facility owned and operated by the Prairie Island Indian Community (PIIC) in Welch, MN – Goodhue County. Treasure Island Amphitheater (16,000 capacity), Island Event Center (2,800 capacity), The Lagoon (indoor waterpark), Wave Spa, Spirit of the Water, Marina, RV Park, Island Xtreme Bowl, Cyber Quest arcadeĤ4☃7′56″N 92☃9′00″W / 44.63215°N 92.64992°W / 44.63215 -92.64992

For the Las Vegas casino, see Treasure Island Hotel and Casino. This article is about a Native American casino in Minnesota.

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