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Although the risk of flooding along rivers has not decreased in the United States over the past several decades, the number of stations in the U.S. Geological Survey's (USGS) streamgaging network has dropped significantly during that same time period, according to a new report by the agency to Congress, “A New Evaluation of the USGS Streamgaging Network.”

The decline in streamgaging stations also is affecting the ability to forecast long-term changes and determine water quality, the report states.