| Puente de Trujillo Alto | |
| Nearest City: | Trujillo Alto, Puerto Rico |
| Coordinates: | 18.3586°N -66.0036°W |
| Map Label: | Puente de Trujillo Alto |
| Built: | 1939-1941 |
| Engineer: | Robert R. Prann |
| Architecture: | Pennsylvania through truss |
| Added: | January 28, 2010 |
| Area: | less than one acre |
| Refnum: | 09001289 |
| Designated Other1 Name: | Puerto Rico Historic Sites and Zones |
| Designated Other1 Color: |
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| Designated Other1 Num Position: | bottom |
| Designated Other1 Number: | 2008-19-01-JP-SH |
| Designated Other1 Abbr: | RNSZH |
| Designated Other1 Date: | October 6, 2008 |
The Puente de Trujillo Alto is a Pennsylvania through truss bridge built during 1939–1941 in Puerto Rico in the Trujillo Alto municipality of Puerto Rico.[1] At was the longest single-span bridge in Puerto Rico.[2]
The bridge construction was funded as part of the New Deal.[3] The supporting structures and bridge were built by Robert Prann, an engineer who established private practice in Puerto Rico, with steel components manufactured by U.S. Steel.[1]
Crossing 70feet above, it spans the Río Grande de Loíza, the largest river by volume in Puerto Rico. The height was intended to keep this bridge above flooding that had destroyed a previous bridge in 1936. However, in 1945 even this bridge was flooded over and almost carried away.[1]
A four-lane concrete bridge was built adjacently during 1983-85 as a replacement, with the historic bridge being slated for demolition, but local protests led to its being kept.[1]