"The state's current laws deny its gay and lesbian citizens their fundamental right to marry and, in so doing, demean the dignity of these same-sex couples for no rational reason," U.S. District Court Judge Robert J. Shelby wrote, according to the Salt Lake Tribune. "Accordingly, the court finds that these laws are unconstitutional."
Here's a link to the ruling.
The ruling comes a day after New Mexico became the 17th state to back same-sex marriage, and a few days after a judge in Utah largely struck down the state's ban on polygamy.