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Losses in the United States

1780's to 1980's

Correlation with Other Data Sets

There appears to be close agreement between the data tabulated in this report and other data from sources that have been used to estimate original or existing wetland acreage. The total wetland acreage reported here for the 1980's is comparable with the findings of Frayer et al72. given the statistical range of variability. (Frayer et al. estimated 99 million acres existed as of the mid-1970's in the conterminous U.S. +/- 6.4%). Because the techniques for determining acreage totals for the various estimates are very different, it is useful to draw comparisons to other national data sets on wetlands.
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