Thomas v. Peterson
753 F.2d 754 (9th Cir. 1985)

  • The US Forest Service (USFS) was interested in building a road through a forest that contained endangered wolves.  They were sued by environmental groups for violating the Endangered Species Act (ESA).
    • USFS did not make a formal request to the US Fish and Wildlife Service (FWS) to determine the impact they road would have on the wolves, as they were required to do under the ESA §7(a)(2).
    • The environmental groups sought an injunction to stop the USFS from building the road until they were in compliance with the ESA.
  • The Trial Court denied the injunction.  The environmental groups appealed.
    • The Trial Court found that the USFS technically should have alerted the FWS, but it didn't matter because the FWS was already aware there were endangered wolves in the area.
  • The Appellate Court reversed and issued the injunction.
    • The Appellate Court found that once an agency is aware that an endangered species is present, the ESA requires that they prepare a biological assessment to determine if their proposed actions are likely to affect the species.
      • USFS did not do this, and did not ask FWS to do it for them.
      • The Appellate Court likened this to a failure to prepare an Environmental Impact Statement (required under NEPA), and so there should be similar sanction.