On March 12, 2018, Plaintiffs, a coalition of environmental interest groups led by the Natural Resources Defense Council (“NRDC”), filed the currently operative Sixth Supplemental Complaint (“6SC”), which includes numerous claims brought under the Administrative Procedure Act (“APA”), 5 U.S.C. § 701 et seq., and the Endangered Species Act (“ESA”), 16 U.S.C. § 1531 et seq., against the U.S. Bureau of Reclamation (“Bureau” or “Reclamation”), the U.S. Fish and Wildlife Service (“FWS” or “Service”) (collectively, “Federal Defendants”), and various Joined Defendants and Defendant Intervenors. See generally ECF No. 1187. The remaining claims in the case1 allege that the renewal, implementation, and approval of renewal and implementation of certain long-term water contracts violate the ESA and/or APA. Id.