The Heinz Center's State of the Nation's Ecosystems
ecosystem: Freshwater
indicator Name: Changing Stream Flows: Major Changes in Low Flow
page # in printed report: 142
location on page: middle
data source: U.S. Geological Survey; analysis by Colorado State University. Coverage: lower 48 states.
notes: please see technical notes for further details on accessing these data from their original source; this data table comes from a specific graphic in The State of the Nation's Ecosystems report (www.heinzctr.org/ecosystems)

units: % of Streams/ Rivers With Major Changes
  increase decrease timing
1970s 30.57 30.91 27.45
1980s 35.29 26.41 28.72
1990s 37.49 28.49 31.6