Extended Data Table 1 Contribution of different protection types to total protected river length in the United States (in %)

From: National assessment of river protection in the United States

Protection type

Contiguous United States

United States

Federal

64.6%

74.2%

State

31.1%

23.2%

Local

0.9%

0.5%

Private

1.9%

1.2%

Other

1.5%

0.9%

  1. Note that due to overlapping designations across protection types, the contribution was expressed as a percentage of the sum of protected lengths. ‘Other’ includes American Indian Lands, Regional Agency Special District, Joint, and Unknown Management.