Early photo of Big Bear Lake dam

Dam! The Creation of Big Bear Lake

Posted: 07/08/22

Did you know that Big Bear Lake is 90% man-made? How is this possible?

While the center of the valley did contain a small marshy lake, the area that is now Big Bear Lake was actually heavily forested before 1884 and the north and south shores weren't distinctive.

A flooded Big Bear Valley

The new Rock Dam did spark environmental concern as it caused the drowning of over 9,000 trees in the valley.

The Rock Dam was designed and financed by Frank Elwood Brown, a citrus farmer who needed a reliable source of water to irrigate his San Bernardino Valley farms. Completed in 1884, the Rock Dam held back 25,000 acre feet of water over 1,800 acres of land. At the time, Brown has created the largest man-made lake in the world.

First Big Bear Lake dam prior to 1911

In 1910, work started for the construction of a new dam to replace the Rock Dam. John Eastwood designed a unique multi-arch wall that at its completion in 1912, stood 20 feet higher than the original Rock Dam. It also doubled the size of Big Bear Lake. When lake levels are low enough the top of the Rock Dam can be seen just above the surface.

Image of new dam in Big Bear Lake

With the new dam came the development of Big Bear's tourism industry. The completion of roads into the valley also made Big Bear accessible to anyone with a car and amenities like hotels, marinas, and The Village developed and grew quickly. In 1916, the Bear Valley Land & Water Co made the surface of the lake free for boating and fishing.

Discover Big Bear's golden history

Historical remnants from the irrigation days can still be seen, like the famous Dam Keeper's House that homed numerous families in the early days of Big Bear Valley. Photo Cred: Brady Enger


Big Bear History Site | History and facts about Big Bear, California