 The modern routing of this highway was originally defined in 1954 . Since then , FM 1957 's western terminus has been extended to FM 471 near Rio Medina , and the entire routing along Culebra Road was transferred to FM 3487 . Before the current routing was established , FM 1957 was also the designation for a highway in Borden County from 1951 to 1954 , now part of FM 1610 . 
