Observable Framework View source

U.S. dams: national overview

Data from the National Inventory of Dams

U.S. dam locations

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Dam counts by state or territory

Total dams listed in NID:

Of U.S. dams included in the National Inventory of Dams, are listed as being in Poor condition. Of those in Poor condition, have High hazard potential, where “downstream flooding would likely result in loss of human life.”

Nationwide dam risk: hazard potential and condition

Size indicates number of dams at each intersection

Dam condition by year completed