Paradox Valley, Valley in Colorado, United States

Paradox Valley is a deep, elongated valley in western Colorado, carved into the landscape with steep walls and a flat floor. The valley runs roughly east to west, and the Dolores River crosses it in a narrow, winding channel.

The valley was formed by the collapse of a salt dome, a process that geologists began to understand in the early 20th century. In the 1920s, a small community grew near the river, supported by farming and later by mining.

The name comes from the strange behavior of the Dolores River, which enters and leaves the valley at almost the same point. Local ranchers have long used the valley floor for grazing, and the few buildings reflect that rural life.

Access is via a paved road that winds down into the valley, offering several pullouts for views. The best time to visit is spring or fall, when temperatures are mild and the light is soft.

The river's unusual course is due to the valley being a collapsed salt dome, a rare geological feature. Visitors can see exposed rock layers that reveal millions of years of Earth's history.