from page 30 of Matt Clinton's Scrapbook:

In the spring and early summer of 1821 the survey began. Dr. W.S. Wyman says that Dr. William A. Cochrane is  our authority for knowledge about the survey. Cochrane stated that the survey started at the boat landing. A road running in a southeasterly direction was laid off as far as the brow of the river hill. From that point a street 132 feet (two chains) wide was surveyed [ed. note: a standard survey chain is 66 feet long]. Roughly, it was perpendicular to the direction of the Warrior River flows. That street was called Market Street [ed. note: present-day Greensboro Avenue]. At right angles it was laid off a street, also 132 feet wide, called Broad Street (sometimes called Main Street) [ed. note: present-day University Boulevard]. Other streets in the square mile that was original Tuscaloosa were surveyed in conformity to these two. These streets are 99 feet (one and one half chains) wide.

from page 31 of Matt Clinton's Scrapbook: