Los Túneles subterráneos de San Germán
Encyclopedia
Los Túneles subterráneos de San Germán is a vaulted brick storm sewer system built in 1835 underneath the urban center of San Germán, Puerto Rico
San Germán, Puerto Rico
San Germán is a municipality located in the southwestern region of Puerto Rico, south of Mayagüez and Maricao; north of Lajas; east of Hormigueros and Cabo Rojo; and west of Sabana Grande. San Germán is spread over 18 wards and San Germán Pueblo...

. The system is made of a central tunnel and several smaller side tunnels. The construction is of brick and rubble with modern concrete repairs. The main part of the system covers the underground course of Quebrada Manzanares from its headwaters to its resurgence as a surface stream, 842.53 metres (2,764.2 ft) away. The vaulted brick branches, most of them abandoned and sealed, date mostly from before 1910. The tunnel sections built up to 1918 are listed on the National Register of Historic Places
National Register of Historic Places
The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

as Alcantarilla Pluvial sobre la Quebrada Manzanares.

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