[2] The archives of the Old Spanish Trail Association are now held in the Special Collections of the Louis J. Blume Library at St. Mary's University in San Antonio.

[citation needed] A decade-long centennial celebration was planned to begin in 2019 and end with a 2029 motorcade from St. Augustine to San Diego.

It begins at the Huguenot Cemetery in Saint Augustine and ends at Horton Plaza Park in San Diego.

Throughout Northern Florida from Jacksonville, the Old Spanish Trail follows either U.S. Highway 90 or local streets that used to be part of US 90, many of which are designated as State Road 10A.

and Old Spanish Trail, heading into a residential area and dead-ending at a tributary to the Blackwater River where it is assumed a bridge once carried traffic into town.

Between Elsanor and Loxley, the trail traveled through Rosinton prior to the establishment of the U.S. Highway System, and continued West along Alabama County Road 64 to Daphne where a ferry once carried traffic into Mobile.

At Kiln, the OST continued West to the ghost-town of Logtown, Mississippi, although the road connecting those two towns has been partially lost to the Bayou.

South of Slidell at North Shore, another ferry once carried autos to Chef Menteur at which point the trail followed Gentilly Road into New Orleans.

Today, traffic on the OST follows Louisiana Highway 433 south to US-90 which travels Southwest to connect with Gentilly Road.

By the 1930s, the OST had been re-routed to follow US-90 as it existed at the time, including the use of the Huey P. Long Bridge to cross the Mississippi river out of New Orleans.

The trail enters Houston on Navigation and turns down Main Street, exiting the city as U.S. Route 90 Alternate.

On the grounds of City Hall can be found a Zero Milestone marker dedicated by Governor Pat Neff on March 27, 1924.

At Leon Springs, The Old Spanish Trail departs the highway and travels North along Boerne Stage Road.

A portion of the trail remains as a segment of U.S. Route 290 west of Ozona, Texas in Crockett and Pecos Counties.

This scenic loop includes the descent of Lancaster Hill, a crossing of the Pecos River at an old iron bridge, and passes through the small community of Sheffield before rejoining Interstate 10.

From Aden, the trail traveled northwest parallel to the Southern Pacific Railroad through Cambray and then approximately followed what is today New Mexico State Road 549 to Deming.