US 77 Alt. begins at an intersection with US 77 (Future I-69E) in
Refugio;
US 183 also begins at this point and
runs concurrently with US 77 Alt. for approximately . While US 77 (Future I-69E) runs to the northeast towards Victoria, US 183/US 77 Alt. travels more to the north, through unincorporated
Refugio County and into
Goliad County. The highway intersects
State Highway 239 (SH 239) south of
Goliad and runs concurrently with it until its reaches downtown Goliad and
US 59 (Future
I-69W); US 183/US 77 Alt. continues to the north, while westbound SH 239 turns onto southbound US 59 (Future I-69W). North of Goliad, past a junction with
SH 119, it begins to travel slightly toward the northeast. The next major city is
Cuero in
DeWitt County; in a wrong-way concurrency, southbound
US 87 merges on to northbound US 183/US 77 Alt., and the three US Highways stay merged until US 87 separates in downtown Cuero. North of Cuero, US 183 finally separates from US 77 Alt.; US 183 turns to the northwest, while US 77 Alt. turns sharply to the northeast, toward
Lavaca County and
Yoakum. West of
Hallettsville, US 77 Alt. merges onto
US 90 Alt., and the two routes stay merged until downtown Hallettsville, where US 77 Alt. ends at another intersection with US 77. ==History==