OK, Dulles wasn't all that new, from their site:
The Fort Bend Independent School District was formed on April 18, 1959 by the consolidation of the Missouri City Independent School District and the Sugar Land Independent School District. At that time the facilities consisted of 2 elementary schools, a junior high, a senior high [Sugarland HS??], and two football stadiums.
A site was immediately purchased on Dulles Avenue (at that time known as Lester Road) and the construction of the Administration Building and John Foster Dulles High School began. Fort Bend ISD had its first graduating class in 1960. The first class actually graduated from the present Dulles High School in 1962. The class of 1963 was the first graduating class from Dulles High School to spend an entire year at the new facility. Many people consider Dulles High School to be the first high school in Fort Bend, since it was the first one built by the district under this new name.
Our daughters graduated from Dulles HS in 1978 and 1981. Our oldest son graduated from Strake Jesuit in 1979 and we moved to Washington State in 1982 where the younger son graduated in 1983 after attending SJHS for 3 years.
Dulles HS was HUGE -- just short of 5000 kids -- when our daughters attended there. Just after we moved, the district split and Stafford built their own schools (including a HS). It was highly controversial because the administration building of the Ft. Bend School district was actually located in Stafford with the city line actually going through the building.
Ft. Bend quickly built at least 2 other high schools, and I can't remember their names. With all the splitting, I hope that Dulles HS isn't so big now. That's one of the reasons we did not send our sons there. I don't think that it is prudent for a HS to be so big.