Water Rustlers (1939)

"THE SINGING COW GIRL! She Outrides...Outshoots...Out sings them All! Thrill to the Brave Adventures of this Darling Songbird of the West!"

Shirley Martin finds that Weylan has diverted the water from the valley and her cattle are dying. First she and her foreman Bob Lawson go to court. This fails when Weylan's men keep the ranchers from testifying. But Shirley has a second plan to return water to the valley.