 Farm to Market Road 1957 ( FM 1957 ) , is a Farm to Market Road in the U.S. state of Texas . Located in Medina and Bexar counties , the 15 @.@ 983 @-@ mile @-@ long ( 25 @.@ 722 km ) highway serves as an arterial street through the growing western suburbs of San Antonio . FM 1957 is known as Potranco Road within Bexar County , and is legislatively defined as Urban Road 1957 ( UR 1957 ) east of Loop 1604 . 
