Water Tower Pl/Shoppes-WaterTower stands as a major retail hub in Arnold, MO. The Power Center is situated at I-55 & Hwy. 141. Originally opened in 1993, the mall was updated and renovated in 2006. Covering 450,000 sqft. of retail space, Water Tower Pl/Shoppes-WaterTower hosts roughly 41 individual stores and outlets.