The History of

Rio Grande Valley's


The Surface History of the Resacas


The Soil Composition of the Resacas

Soil Profiles : Laredo and Olmito soils

Student Experiments

The Resaca's Role in Agriculture

History of San Benito Land & Water Company

Internet Resources

Geology Glossary


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Main Menu

The history of the Rio Grande Valley's resacas is a unique insight into the birth and continuing growth of deep South Texas's agriculture.

To understand what a resaca is, one must comprehend its meaning. Resaca is the Spanish word for dry river channel. The valley's resacas are ancient tributaries and channels that once fed into the mighty Rio Grande River. The resacas were cut off from the main river by geological changes that occurred over thousands of years.

As people settled in the Rio Grande Valley, the resacas took on a variety of roles in crop growing, recreation, and providing water to its inhabitants. This web site will provide information on the resaca's geological and cultural history, soil composition and role in agriculture.