GLENDIVE — Sonar indicates part of an underground pipeline that spilled almost 40,000 gallons of oil into Montana’s Yellowstone River and fouled a local water supply is exposed on the riverbed.
OMAHA, Neb. — The amount of water flowing into the Missouri River this spring is expected to be close to normal levels.
ROCK SPRINGS, Wyo. — State environmental regulators say they've begun to analyze contamination levels in two creeks in Rock Springs after a decade of monitoring.
BOZEMAN — State environmental regulators want the city of Bozeman to drill more monitoring wells and provide more information on the city's plan for cleaning up contamination seeping out of an old landfill.
CHEYENNE, Wyo. — The federal agency in charge of environmental protection at surface mines including Wyoming's huge open-pit coal mines has agreed to work toward regulating the toxic chemicals that sometimes get ejected into the air during blasting.
CASPER, Wyo. — Wildlife officials have launched a text message and phone application system to help Wyomingites report poaching.
DENVER — Federal officials say their decision to protect dwindling Gunnison sage grouse populations in Colorado and Utah has no bearing on next year’s highly anticipated ruling on the far more widespread species of greater sage grouse — but advocates on both sides already are placing their bets.
WILLISTON, N.D. — Authorities say workers are attempting to contain an out-of-control oil well in North Dakota.
BUFFALO, Wyo. — The Wyoming Game and Fish Department is seeking information about the poaching of two young bull moose on the Bighorn National Forest west of Buffalo.
CASPER, Wyo. — Wyoming Game and Fish Department officials aren't disclosing how many dead antelope they've found since poachers opened fire on the animals along a road in central Wyoming last week.
CASPER, Wyo. — Wyoming Game and Fish Department officials are seeking information about pronghorn antelope that were shot west of Casper on Friday afternoon.
CHEYENNE, Wyo. — The air quality in Laramie County and other communities in Wyoming could fall below federal standards under a new rule being considered by the U.S. Environmental Protection Agency.
NEW YORK — Hundreds of corporations, insurance companies and pension funds are calling on world leaders gathering for a U.N. summit on climate change this week to attack the problem by making it more costly for businesses and ordinary people to pollute.
LARAMIE, Wyo. — The Wyoming Game and Fish Department is seeking information on the illegal killing of an elk in Albany County.
CHEYENNE, Wyo. — An oil boom in Wyoming has a filthy side effect: A string of accidents from a remote gulley in the Powder River Basin to a refinery in downtown Cheyenne already has made this year the state’s worst for oil spills since at least 2009, state records show.
HELENA — A man who was accused of plotting to kidnap talk show host David Letterman’s young son and nanny nine years ago was released from a Montana prison Thursday, state corrections officials said.
CHEYENNE, Wyo. — The U.S. Environmental Protection Agency can’t force several Wyoming power plants to install new pollution-control equipment while the state’s legal challenge to federal regulations plays out in court, an appeals court panel ruled Tuesday.
CASPER, Wyo. — The location of a proposed facility to test new technologies for capturing carbon dioxide from a working power plant could be selected by state officials within the next few months, a utility official said.
NEW CASTLE, Colo. — Four in 10 new oil and gas wells near national forests and fragile watersheds or otherwise identified as higher pollution risks escape federal inspection, unchecked by an agency struggling to keep pace with America’s drilling boom, according to an Associated Press review …
SIOUX FALLS, S.D. — Senators from the Dakotas are among those making another attempt to have the bison declared the national mammal, citing the animal's historical significance and importance to Native Americans.