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United States v. Washington

The Ninth Circuit held that Washington state's management of barrier culverts, which allow streams to flow underneath roads, violated various Native American treaties from the 1850s and ordered the state to correct them. The "Stevens Treaties" were entered into in 1854-1855 between Native American t...

Sierra Club v. United States Environmental Protection Agency

A district court ordered EPA to impose a "good neighbor” federal implementation plan (FIP) for Texas with respect to the 1997 fine particulate matter (PM2.5) NAAQS. In 2015, the D.C. Circuit invalidated portions of EPA's Cross-State Air Pollution Rule, which included a FIP addressing interstate tr...