The Sierra Nevada mountain range has an average width of approximately 80 miles.

The Sierra Nevada is a prominent mountain range that stretches for about 400 miles along the eastern edge of California. It's characterized by its towering peaks, deep valleys, and extensive forests. This mountain range was formed by tectonic forces that uplifted the Earth's crust over millions of years. The Sierra Nevada is home to some of the highest mountains in the contiguous United States, including Mount Whitney, the highest point outside of Alaska. Its rugged terrain and diverse ecosystems have made it a popular destination for outdoor activities such as hiking, camping, and skiing. While the width varies along its length, the average width of the Sierra Nevada is approximately 80 miles.