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texas 99State 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 dividedState Hhway 99. FM 1093 to I -10: Main Lanes, Frontage Roads and Noise Barrier Update. PROJECTNEWS. May 2025. Quick Facts. Project Location. Harris and Fort Bend Counties.