ALBUQUERQUE, N.M. (AP) — A U.S. court has sided with a New Mexico ranching family in a decades-long battle over access to water on national forest land, providing more certainty that state law allows for the protection of water rights dating back more than a century.

The case of the Goss family has been closely watched by thousands of ranchers who hold grazing permits across the West. Attorneys and others say the outcome could have ripple effects on ranchers and rural communities that have often complained about federal land managers trampling property rights.

The Goss family claimed the feder...