texas 99State Hhway 99 (SH 99), also known as the Grand Parkway, is a beltway in the U.S. state of Texas. Its first section opened on August 31, 1994.State Hhway 99 (the Grand Parkway) is a proposed 180-mile circumferential hhway traversing seven counties in the Greater Houston area. Conceptualized in the early 1960s, it is divided