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The San Luis Valley in Colorado, Monday, August 17, 2015. The People's Ditch, located in the town of San Luis, is the oldest continually used ditch in Colorado. The People's Ditch was initially a shallow hand-dug irrigation channel. Later, oxen pulling a plow widened and extended the ditch. Operating under Water District 24 of Division 3, the People's Ditch holds the first adjudicated water rights in Colorado.<br />
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Photo by Matt Nager