Alabama State Route 158

State Route 158 (SR 158) is a 21.44 mi state highway in northern Mobile County in the southwestern corner of the U.S. state of Alabama. The western terminus of the highway is at an intersection with U.S. Route 98 (US 98) northwest of Wilmer, just shy of the Mississippi state line. The eastern terminus of the highway is at an intersection with U.S. Route 43 (US 43) at Saraland. The route will eventually become part of US 98 west of Mobile to the Mississippi state line as a four-lane bypass of Semmes.

Route description
SR 158 serves as a connector route between U.S. Route 98 (US 98) and U.S. Route 45 (US 45) to the west and Interstate 65 (I-65) and U.S. Route 43 (US 43) to the east. It is a four-lane expressway that connects Mississippi, Semmes, the University of Mobile and Saraland. The route widens to five lanes at its intersection with SR 213 near its interchange with I-65 at exit 13. The highway narrows to two lanes east of the interstate highway as it continues to its intersection with US 43.

History
SR 158 was first established in 1963.

SR 158 was extended from its previous western terminus at Newburn Road 12.16 mi to US 98. It bypasses a stretch of US 98 ("Old 98"), colloquially known as "Bloody 98" by locals due to its high amount of traffic fatalities. Construction began in 2017 and was originally scheduled for completion by late 2023 to early 2024. Most of the route is completed, with the portion west of Wilmer still under construction as of June 2023. The extension opened to traffic on October 17, 2023.