On July 6, 2020, the Supreme Court partially and temporarily overturned a nationwide injunction that prevented the U.S. Army Corps of Engineers (“Corps”) from using Nationwide Permit 12 (“NWP 12”) for construction of new oil and gas pipelines. NWP 12 authorizes “utility line activities” that have minimal impacts on jurisdictional waters under the Clean Water Act. In April 2020, a federal judge in the District of Montana, while considering challenges to the construction of the Keystone XL pipeline, completely vacated the Corps’ use of NWP 12 for all activities (including pipelines, broadband, electric, water, and sewer) until the Corps consulted with the U.S. Fish and Wildlife Service and the National Marine Fisheries Service pursuant to the Endangered Species Act. Nearly a month later, following a motion from the Corps seeking relief from that vacatur, the district court amended its April 2020 ruling to apply only to new oil and gas pipeline construction projects other than “maintenance, inspection, and repair activities” on existing pipelines.