/ Option value is estimated for the Washakie Wilderness, northwest Wyoming, USA, using the contingent valuation technique. Consumer surplus, the traditional measure of economic value, is estimated separately and compared with option value. Several populations are tested, including Washakie visitors, Yellowstone National Park visitors, and residents from four metropolitan test markets: Salt Lake City, Utah; Portland, Oregon; Nashville, Tennessee; and Orlando, Florida, USA. The average annual preservation option value (consumer surplus) expressed by on-site wilderness visitors is $46.17 ($80.13), by urban residents is $9.70 ($8.97), and by rural residents is $8.43 ($7.80). Four selected attributes are determined to be important in motivating option demand for the Washakie, including existence value, bequest value, the desire for an on-site visit, and interest in securing the visiting privileges of others. The results suggest that option value is important in wilderness valuation and that off-site users account for a large part of the economic value of wilderness.Advancing technology increases the pressure to remove natural resources from remote lands by expanding the resource base and reducing extraction costs. A classic valuation asymmetry arises when development encroaches upon public lands valued in the natural state, like wilderness, parks, and critical wildlife habitat. The value of land in forestry, agriculture, or mineral extraction is easily obtained, but establishing the intangible value of the natural world is not so straightforward (Krutilla and Fisher 1975). The services of the natural state are rarely marketed; nor can the problem be solved by creating markets. The collective-consumption aspect of amenity resources dictates that markets would be inefficient. The valuation asymmetry often results in biased land allocation decisions: the intangible value of the natural environment is ignored, or assumed to be small, when compared with the more readily marketed commodities that can be extracted from it. Without an anchor for the nonmarket side, the decision-making process is free to drift toward special interests. Moreover, without reasonable value estimates for wild environments, it is impossible to know if irreversible allocations to other uses are correct or not.Consumer surplus captures the traditional non-