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The coloring made me agree with Brown Pelican or contemplate the Peruvian Pelican. Peruvian Pelicans are said to be nearly twice the weight of the brown pelican, and longer/taller. A check of ebird.com told me there have been zero sightings of Peruvian Pelicans in the area of your sighting. However, of all of the Brown Pelican sightings, I could find none there in August. (The Brown Pelican sightings there seemed to be March, May and December.) This makes me wonder if your bird missed (or skipped) a migration. ...Nice spotting!