While the survey's numbers represent a sizeable contribution to the area's economy, the spending averages are adapted from national averages for each park type and size of visitation, adjusted for surrounding populations and spending opportunities. Therefore, because the three California State Parks in the Redwood National and State Park partnership were not included in this survey (Del Norte Coast Redwoods, Jedediah Smith Redwoods, and Prairie Creek Redwoods State Parks), the actual numbers for both visitation and spending for Redwood National and State Parks are considerably higher than reported. Redwood National and State Parks managers estimate that the annual combined visitation to all four parks within the partnership is, at a minimum, 700,000 people per year. At this level of visitation, it is more likely that the parks bring at least $42,000,000 in visitor spending and over 500 local jobs to the economy.