Beaver Lake is the primary water supply for a rapidly growing region in Northwest Arkansas. The lake is a popular tourist destination and land surrounding it is highly sought after for development. Some voice concern that development could affect lake water quality negatively and threaten future regional growth. The results of the study presented here suggest the spending of 2.4 million annual visitors to Beaver Lake generates 600 jobs, US$12.9 million in income and US$20.9 million in value added to the region. However, this economic activity is not likely to offset the costs to the region of maintaining the water supply and the water quality of the lake.