Introduction The Rio Grande Valley, located in the southeastern corner of Texas, is composed of four counties;Expansion of the Urban Area in Irrigation Districts Map series of counties along the Rio Grande River Basin showing the expansion of the urban area over the ten year period between 1996 – 06 Irrigation District service areas are also shown For individual District maps, see Texas Irrigation Districts section belowThis stop on the Rio Grande Valley Civil War Trail takes us to Starr County and the city cemetery in Rio Grande City In the same year that the territory north of the Rio Grande was grafted onto the United States by the Treaty of Guadalupe Hidalgo, Rio Grande City residents Henry Clay Davis and Hilaria Davis donated land for a city cemetery
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