Major flooding was observed during July 2007 as record rainfall occurred over South Texas. By the time the month ended, most river locations exceeded flood levels at least once during the 31 day period.
During the first part of July, a persistent, nearly stationary upper level low which brought catastrophic flooding to North Texas late in June moved south during the first few days in July, resulting in very heavy rainfall and widespread flooding over much of the area. Dozens of flash flood warnings were issued, and moderate to major flooding was observed over most rivers east of the Rio Grande. In fact, some of the river crests observed were comparable to those observed during July 2002 and September 2002, when record flooding was observed over the Nueces River basin. Six locations had crests which were within the top five highest crests ever recorded:
Nueces River at Calallen (4th highest)| Nueces River at Bluntzer (3rd highest)| Aransas River at Skidmore (3rd highest)| Garcitas Creek near Inez (3rd highest)| Oso Creek near Corpus Christi (5th highest)| Copano Creek near Refugio (3rd highest)
The reservoirs for the Corpus Christi water supply quickly filled, and required releases brought major flooding to the Nueces River south of Lake Corpus Christi. In fact, Bluntzer and Calallen remained above flood stage through July (in part due to rainfall received later in the month).
The Corpus Christi International Airport had the second highest monthly rainfall amount, totaling 18.13 inches (the highest was September 1967 with the remnants of Hurricane Beulah). The Victoria Regional Airport received 20.34 inches. Obviously, all of this excessive rainfall completely filled the reservoirs, with both Choke Canyon and Lake Corpus Christi continuing to release water through July 31.