The Bureau of Reclamation will pay $86.7 million toward Tucson's new water treatment plant, which will stretch the city's supplies.

In response to a lawsuit from conservation groups, the Federal Highway Administration and Arizona Department of Transportation have agreed to halt planning activities and reevaluate their approval of Interstate 11.

Tucson City Councilmembers voted to approve a proposal to use some $86 million worth of Bureau of Reclamation funding to build the new treatment facility and save Colorado River water as a result.

The Bureau of Reclamation today announced it is awarding $388 million in grants for Upper Colorado River Basin water projects. Administered via the Bucket 2 Ecosystem program, the grants will support 42 projects that will restore struggling rivers,

Foes of a plan to construct a new interstate highway — including a segment that could go through environmentally sensitive portions of Pima County — have won a

The Sonoran Desert, known for its arid condition, is equally unique and has been dubbed the “lushest desert on earth” because evaporation from the Gulf of California provides moisture and rain. Stingrays are among the many species flowing through this sea in a desert landscape.

The Tohono O’odham Nation signed a co-stewardship agreement with the U.S. Bureau of Land Management for federal lands with deep cultural and religious ties for the tribal nation.

The Center for Biological Diversity and the Patagonia Area Resource Alliance say federal regulators failed to review a petition against Hermosa Mine.

• An Arizona native who now lives in Tempe, Gomez served under Gen. George Patton during World War II and fought on both Omaha Beach and in the Battle of the Bulge.

A project to bring drinking water to Gallup, the Navajo Nation and the Jicarilla Apache Nation has received a lifeline of $120 million in federal funding for the next year.

Gov. Katie Hobbs began the 2024 legislative session saying she was “optimistic’’ about working with the Legislature.

News about Tucson Water's plans to treat sewage effluent to drinking quality coincided this week with national headlines: New research finds much treated wastewater across the U.S. is contaminated wit