Easy to follow instructions:

Progreso is located about eight miles from Weslaco, Texas. Weslaco is midway between Harlingen and McAllen. From Expressway 83 take the Texas 1015 or "International Blvd" exit and go south about 7 miles. Park on the US side for $2.00 or cross the bridge by car for $2.00 and return for about $2.00. Parking is available on the main street and there are parking lots available. Walking across the bridge costs .25¢ and .30¢ returning. The office is about 1/4 mile from the bridge with covered sidewalks on both sides of the main street. A printable map in .pdf format is located here.

The office is located in the second block on the West side of the street just a few doors from the Angel's tower beside Rene's restaurant.		The new office is located in the first block on the East side of the street across from Kokopelli store.

Map to reach Nuevo Progreso is here:

It is in Adobe Acrobat format.
Note that you should bring a passport as it became required by the US Government in 2009. If you do not have one and need emergency treatment, you may use governmentally issued photo ID, such as a driver's license, and proof of citizenship, which might be your birth certificate. If repeated visits are required you can get a letter from Dr. Pablo telling the Border Patrol of your further visits and they will accomodate you at the border crossing. You can learn more about this at this location. Click on location.