Route 121, which connects the communities of Ciudad Colón and San Rafael de Escazú, required the design and construction of major drainage structures. This is a project divided into three sections. The first section includes works in the Agres River (11.1 meters long), the Chiquero River (9.5 meters long), the Cruz River (9.9 meters long), and the Convento River (7 meters long). The second section includes works in the Caraña River (5.85 meters long), the Oro River (14 meters long), the Cubillo Creek (5.39 meters long), the Azul River (5.87 meters long), the Uruca River (15.8 meters long), and the Corrogres River (12 meters long). The third section includes works in the Muerte Creek 1 (11.3 meters long), the Muerte Creek 2 (12.2 meters long), the San Marcos Creek (5.4 meters long), the Guapinol Creek (6.6 meters long) and the Cross Creek (5.3 meters long).
