We analyze the economic determinants and effects of prior appropriation water rights that were voluntarily implemented across a vast area of the US West, replacing common-law riparian water rights. We model potential benefits and test hypotheses regarding search, coordination, and investment. Our novel data set of 7,800 rights in Colorado, established between 1852 and 2013 includes location, date, size, infrastructure investment, irrigated acreage, crops, topography, stream flow, soil quality, and precipitation. Prior appropriation doubled infrastructure investment and raised the value of agricultural output beyond baseline riparian rights. The analysis reveals institutional innovation that informs contemporary water policy.
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