What rivers and mountain ranges did settlers have to cross following the santa fe trail and the old spanish trail to california.?

During the 1800s, thousands of settlers traveled west in search of new land and opportunities. Many families traveled in wagons. They followed overland trails across the continent. These trails were often dangerous and difficult to travel on. For settlers to reach the California coast they had to cross the Rocky Mountain chain. The settlers had to cross the Rocky Mountains to reach Oregon's Pacific Coast.