Trouble Right Here in River City

5,270 large dams blocked rivers in 1950 36,500 large dams block rivers today 17 percent of U.S. rivers are currently dammed 600,000 miles of rivers in the U.S. have been impounded behind dams 235,000 miles of rivers in the U.S. have been channelized 25,000 miles of rivers in the U.S. have been dredged for navigation […]

5,270 large dams blocked rivers in 1950
36,500 large dams block rivers today
17 percent of U.S. rivers are currently dammed
600,000 miles of rivers in the U.S. have been impounded behind dams
235,000 miles of rivers in the U.S. have been channelized
25,000 miles of rivers in the U.S. have been dredged for navigation
80 percent of river water in California is used for irrigation
87 percent of river water in Arizona is used for irrigation
25 percent of U.S. dams are older than their life expectancy of 50 years

Sources:
1, 2 — World Resources Institute
3-7 — American Rivers

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