Colorado State Highway 142
|Maintained by CDOT|
|Length:||33.8 mi (54.4 km)|
|West end:||US 285 just outside Romeo|
|East end:||SH 159 at San Luis|
SH 142 begins in the west at its junction with U.S. Highway 285 mere feet outside the city limits of Romeo. The route heads east through the towns of Manassa and San Acacio before reaching its eastern terminus at San Luis where it meets State Highway 159.
The highway passes through the San Luis Hills and over the Rio Grande. The Manassa Dike is visible from the highway as it passes through the hills. Overall, the highway has very little traffic, especially the section that passes through the San Luis Hills. Highway 142 connects the two river valleys (Conejos, Culebra Creek), passing through a high desert with little vegetation.
All of the highway forms part of the Los Caminos Antiguos Scenic Byway 
|Conjeos||Romeo||0.000||US 285||West end of route|
|Costilla||San Luis||33.840||SH 159||East end of route|