Spur 557 is the original routing of I-20 prior to I-20 being rerouted to the south.

The route traverses a largely undeveloped area in Kaufman County, Texas between Forney, Texas and Terrell, Texas and serves to distribute eastbound traffic onto Interstate 20 and westbound traffic onto the US 80 freeway leading into the Dallas-Fort Worth Metroplex.

Spur 557 was designated on August 18, 1987 on an old alignment of I-20 when it was rerouted southeast of Dallas.

It begins at the eastern end of the freeway segment of US 80 and heads towards the southeast.

Spur 557 has two interchanges between its two termini: one at the Las Lomas Parkway and another at FM 148.