# The Mattel Wonder Indoor Waterpark is planned for Bradley, Wisconsin.

*business · news · 2026-04-19 · Shaw Local Enewspapers*

## Key points

- Martin Aquatic Design and Engineering will handle all 'wet' attractions and theming for the Mattel Wonder Indoor Waterpark.
- A newly approved change order allows for a freestanding glass tower enclosure for the water slide.
- The glass-enclosed area may expand to 2.5–3 acres, increasing from the original 2 acres.
- Development costs are capped at $100 million, despite numerous ongoing design changes.
- Groundbreaking is still scheduled for this summer with projected opening by early 2028.

**Companies:** Mattel, OpenAire Sales, Inc., Martin Aquatic Design and Engineering, Inc., Ramaker and Associates
**Countries:** United States, Canada

[Read the full story on Shaw Local Enewspapers](https://www.shawlocal.com/daily-journal/2026/04/19/bradley-moves-forward-on-waterpark-groundbreaking-nears/)

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