After leaving behind the Buzzard Rock, you arrive at the Patterson Viaduct, the massive and noble stone structure by which the road crosses the Patapsco. It rises about forty-three feet from its foundation, and has four arches; two of fifty-four feet cord, each, intended for the passage of the stream, and two of twenty feet, one on either side of the river, for the accommodation of two county road ways. The length of this viaduct is upwards of three hundred feet; and, for solidity of construction throughout, it is not surpassed by any thing of the kind in this country. The blocks of granite of which it is built, are of great weight, many of them weighing more than seven tons. lts exterior is undressed, and exhibits, what is ordinarily known, as rustic stone work.
Excerpted from John H.B. Latrobe, Jr., Picture of Baltimore (Baltimore, MD: Lucas Fielding, Jr., 1832), 205.