4 Tex. Admin. Code § 41.18
Quarantined areas are as follows for Webb County. Beginning at a point where the Maverick-Webb County line intersects the Mines Road and following this road in a southeasterly direction to its intersection with Del Mar Boulevard and IH 35, approximately 63 miles; thence, following IH 35 in a southerly direction to its intersection with Matamoros Street (U.S. Highway 83) approximately 4.1 miles; thence, following Matamoros Street in an easterly direction approximately one mile to where Matamoros Street becomes Guadalupe Street; thence, following Guadalupe Street in an easterly direction approximately 1 1/2 miles to where U.S. Highway 83 turns in a southerly direction; thence, following U.S. Highway 83 in a southerly direction, approximately 16.7 miles to where it intersects the Webb-Zapata County line.
4 Tex. Admin. Code § 41.18