In the case of Bennett v. Spear (520 U.S. 154
(1997)), the Fish and Wildlife Service (FWS) was worried that the operation of
the Klamath Irrigation Project would adversely impact two species of endangered
fish. Pursuant to the Endangered Species Act (ESA), they ordered
several reservoirs to maintain minimum levels of water. Some of the people
downstream, who wanted the water for irrigation sued, claiming that FWS did not
consider their decision's economic impact on the region.