Building on 2020’s “Economic Analysis of Outdoor Recreation in Washington State”, a coalition of state agencies tasked Earth Economics with a focused assessment of the total visitation, consumer spending, and economic output associated with outdoor recreation on state-managed lands. This analysis improves significantly on earlier efforts by leveraging voluntarily provided mobile device locational data throughout 2019 and 2020 to generate data-driven estimates of the total economic contribution of visitors to state-managed recreation lands, detailed at more granular geographic and temporal scales.