AUSTIN, TX SH 45SW is an innovative four-lane toll road to be constructed on state-owned right-of-way between MoPac and FM 1626 that will bring relief to the rapidly growing area of northern Hays and southern Travis counties. Access to SH 45SW will be available from FM 1626, Bliss Spillar Road, MoPac, or SH 45 west of MoPac.

The Selected Alternative runs southeast from the intersection of MoPac and existing SH 45 to FM 1626 approximately 1 mile south of Brodie Lane and will include bridges over Bliss Spillar Road; Bear Creek; Danz Creek and the Danz Creek Split. This will also connect to existing SH 45 west of MoPac; MoPac; Bliss Spillar Road and FM 1626. 

The Texas Department of Transportation was the lead agency in the development of the SH 45SW Environmental Study, including related environmental documentation and coordination of public outreach. The Central Texas Regional Mobil Authority is designing and will construct, operate and maintain SH 45SW.