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Distinctive and unique, with a nature that celebrated the changing United States as it grew over time, today marks the adoption of the official Flag of the United States by the Second Continental Congress in 1777. #FlagDay

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Our Services

O'Brien Engineering provides a wide variety of services for our clients, including full architecture/engineering design, analysis, and studies (civil, mechanical, electrical, plumbing, structural, cost estimating); real estate services (appraisal, ROW, acquisition, title, closing, negotiation, mapping); specialty water resources services (1D…

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The Acequias of San Antonio

The Acequias of San Antonio are one of the earliest engineered water management systems in the modern-day United States, constructed by Spanish settlers between 1718 and 1744. Today, nearly 300 years later, some sections of the Acequias still provide water…

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