A district court denied a commercial fisherman's motion to preliminarily enjoin the Army Corps of Engineers and EPA from enforcing a 2023 rule that revised the definition of "waters of the United States." The fisherman argued the agencies did not faithfully implement the Sackett v. Environmental Pro...

The Ninth Circuit affirmed a district court's permanent injunction in an ESA citizen suit concerning a proposed timber harvesting project on private property in Oregon. Environmental groups argued the project would cause a "take" of marbled murrelets in violation of the ESA by clearing acres of tree...

In an unpublished per curiam judgment, the D.C. Circuit affirmed summary judgment for NMFS in a challenge to the Service's 2019 rule regarding turtle excluder devices. Environmental groups argued the final rule was not adequately explained, that it was not a logical outgrowth of the proposed rule th...

The U.S. Supreme Court, 5-4, denied two states' motion to enter into a consent decree in a lawsuit concerning a 1938 interstate agreement that apportions the waters of the Rio Grande River among Colorado, New Mexico, and Texas. Texas initially sued Colorado and New Mexico, arguing excessive groundwa...

The Ninth Circuit reversed in part summary judgment for the operators of a marine cargo terminal on Puget Sound in a CWA citizen suit concerning stormwater discharges. An environmental group argued the operators were liable for discharges from the facility's entire footprint, including an area known...

The Ninth Circuit affirmed a district court ruling in favor of the Bureau of Reclamation and FWS in a challenge to the agencies' renewal of water supply contracts in California. Environmental groups argued that FWS conducted an inadequate consultation on the effects of the renewals on delta smelt an...

A district court granted summary judgment for a fisheries biologist in a challenge to the Army Corps of Engineers' flood control operations at a California dam. The biologist argued the operations, which released water from the dam into the Russian River, violated §9 of the ESA by unlawfully "takin...

A district court granted in part and denied in part summary judgment for a conservation group in a challenge to NMFS' management of the Pacific sardine under the Magnuson-Stevens Act (MSA) and NEPA. The group argued NMFS' plan to rebuild the sardine population after it was declared overfished in 201...

The Ninth Circuit affirmed in part and vacated in part a district court's preliminary injunction limiting wolf trapping and snaring in certain parts of Montana to January 1, 2024, through February 15, 2024. Nonprofit groups argued Montana's laws authorizing recreational wolf and coyote trapping and ...

A district court denied the state of Florida's motion for a limited stay of the court's prior ruling vacating EPA's approval of Florida's application to assume permitting authority under §404 of the CWA. Environmental groups initially sued, arguing EPA and FWS violated the ESA because neither the p...