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Column names give the lower bound on the distance, as a percentile of each site’s daily reach lengths, to the nearest structure of each type. For example, the nearest canal or ditch is located between the 0th and 50th percentile of reach lengths at 61 modeled sites; the nearest canal or ditch is beyond the 95th percentile at 246 sites; and 64 sites have no known structure closer than the 95th percentile of their reach lengths.