Lake San Marcos is in unincorporated area of San Diego County, approximately 5 miles northerly of La Costa Spa and the Pacific Ocean. 
In 1927 the Clemson and Wells families purchased the land, and the dam was built at the South end of the creek in 1946, creating a 40 acre lake. 
In 1963 the Frazar Brothers purchased the property and reshaped the shore line and increased the lake size to its present 80 acres.  They subdivided the surrounding property and over the years 1273 condominiums and 915 single family homes were built.

Lake San Marcos boasts an 18 hole, par 58, public Executive Golf Course; a private 18 hole, par 72,  6500 yard championship golf course, pro shop, putting green, driving range and a fine Country Club with restaurant and banquet facilities.  Other amenities include a small Community Park with boat landing and resident fishing; a Community Recreational Complex with Director's office where use is scheduled for The Lodge, Club and Billiard Rooms, four Tennis Courts, three Paddle Tennis Courts, two Swimming Pools and a lake front area with boat docks and boat rentals.  Private Picnic Ground with boat dock is accessible only from the lake.  There is also the Lake San Marcos  Resort Hotel and conference facility, and a very popular restaurant called The Quail.

The uninterrupted Pacific breezes provide nature's air conditioning with temperatures seldom above 80 degrees.  The Cerro de Las Posas mountain on Lake property and the San Marcos mountains to the North, with an eastern exit, create a wind tunnel preventing smog from settling in our valley. 

History of Lake San Marcos Books are available for sale at the Community Association office.  This is a wonderful collection of very early newsletters and photos.