North of US 90, Loop 1604 becomes a four-lane divided highway with median crossings only located at traffic lights and turnarounds at those traffic lights to facilitate traffic flow of vehicles turning around to go in the opposite direction. The highway enters the San Antonio city limits near Marbach Road and follows near the city limit. Major intersections along this stretch include Marbach Road, FM 1957 (Potranco Road) and Wiseman Boulevard. The loop continues north near the campus of Northwest Vista College to a junction with the western terminus of SH 151. The intersection is signalized but southbound traffic is not required to stop due to no left hand turns from SH 151 to Loop 1604. Westbound traffic from SH 151 are either routed to the northbound main lanes of Loop 1604 or the northbound frontage road of Loop 1604. In 2016, TxDOT unveiled plans to upgrade the section from US 90 to SH 151 to a freeway starting in late 2016, and Google Earth satellite imagery showed this freeway under construction in 2017-2018.