The Tierrasanta community, encompassing approximately 11 square miles, lies roughly northwest of the San Diego River, north of Friars Road, south of State Route 52, and east of Interstate 15.
The residential development of Tierrasanta began in 1960, when the federal government declared a portion of Camp Elliott, a Marine Corps Training Camp, as surplus. The City of San Diego adopted the Elliott Community Plan in 1962 to guide the initial acquisition of property for public uses, such as street rights-of-way. Much of the property was then privately developed from the 1970s through the 1990s based on the updated Elliott Community Plan, adopted in 1971. The military legacy of the community still exhibits a strong presence, such as the 2,321 unit Murphy Canyon Naval housing development, which accounts for approximately one-fifth of the total dwelling units in the planning area.
In 1976, the City adopted the boundaries for Mission Trails Regional Park, bisecting the Elliott planning area into two distinct sections. The park and the newly-developing section to the west were severed from the Elliott Community Plan, and a new planning area was formed with the adoption of the Tierrasanta Community Plan in 1982. The more rugged, remote section east of Mission Trails Regional Park is now known as the East Elliott planning area and remains undeveloped.
The inclusion of extensive areas of natural open space has played a considerable role in shaping the form of development within Tierrasanta. Mission Trails Regional Park comprises approximately half of the planning area, and the San Diego River roughly forms the southerly boundary of the community. Canyon systems meander throughout the community, defining the transitions between individual development areas and interconnecting to the larger Mission Trails Regional Park canyon systems.