Stone Bridge over the Bóbr River: The History of the Viaduct in Bolesławiec

Model created by: Atlas 3D – photogrammetry Poland

In the Lower Silesian landscape, spanning the valley of the Bóbr River, stands a structure of monumental scale and timeless beauty – the railway viaduct in Bolesławiec. Its powerful arches stretch nearly half a kilometer and evoke the masterpieces of ancient Roman engineering. This inspiration was no coincidence. In the age of steam and iron, as Prussia built its industrial might, referencing classical forms was a manifestation of ambition, durability, and technological supremacy meant to last for centuries.

An Ambitious Plan in the Age of Steam

The viaduct’s history is closely tied to the dynamic expansion of the railway network in the 19th century. When the first railway line reached Bolesławiec (then Bunzlau) in 1845, plans to extend it toward Węgliniec were already underway. The greatest engineering challenge along this route was crossing the wide valley of the Bóbr River. The task was entrusted to an engineer whose name would forever be linked to the city – Friedrich Engelhardt Gansel.

The construction was an enormous undertaking. The foundation stone was laid on May 17, 1844, and just a month later, on June 18, full-scale work began. More than 600 workers were directly involved on site, and around 3,200 people were engaged in total. Considering Bolesławiec’s population at the time, this was a massive logistical operation that transformed the region for two years, boosting the local economy and drawing in labor. The total cost was an astronomical 400,000 thalers.

Just over two years later, in July 1846, the construction was completed. The first test train crossed the viaduct on July 5, and regular scheduled service began on September 1. The official inauguration was held on September 17, 1846, graced by the presence of King Frederick William IV of Prussia himself. Impressed by the monumental structure, the monarch awarded Gansel the prestigious Order of the Red Eagle.

Architecture and Curiosities

Gansel’s design reflects both engineering precision and aesthetic sensitivity. The viaduct, built entirely from sandstone quarried nearby in the village of Dobra, impresses with both its appearance and technical parameters, which still inspire admiration today.

Length	490 m
Height	26 m
Width	8 m
Number of arches	35
Span types	15 m, 11.5 m, 5.65 m
Material	Sandstone

Interior chambers: Surprisingly, three of the massive pillars are not solid stone. Inside, there are staircases and rooms. One pillar includes 92 steps leading to a chamber that once served as a guard post. This design allowed for internal inspection and held military significance – railways were vital to logistics, and an observation point in such a strategic crossing was a valuable military feature.
Debate over length: The Bolesławiec viaduct is often compared to a similar structure in Zgorzelec. A friendly rivalry among history enthusiasts persists over which one is longer – proof of how much local pride these 19th-century engineering marvels continue to inspire.
Construction sections: Due to the scale of the work, construction was divided into three sections, each handled by a separate team. This organization allowed the entire project to be completed in just two years.

Witness to History – Destruction and Reconstruction

For nearly a century after its opening, the viaduct served uninterrupted. A second track was added in 1860 to accommodate increasing traffic. Its peaceful function ended during World War II. On February 10, 1945, retreating German forces demolished one central western span over the river and three adjacent vaults to halt the advancing Allies.

Thanks to the efforts of Polish railway workers and engineers, the bridge was restored to full functionality by 1947. Further modernizations followed. In 1984–85, the viaduct was electrified. But the biggest transformation came in the last two decades. In August 2006, 58 LED spotlights were installed on the pillars, creating a stunning nighttime display.

The highlight came in October 2009, when the viaduct underwent a complete renovation as part of the modernization of the E30 railway corridor, co-financed by the EU. The stone structure was sandblasted and preserved; a new track system and overhead wiring were added. Trains can now cross at up to 160 km/h. The reopening on October 10, 2009, was celebrated with a public show titled “Light-Steam-Sound” — a steam locomotive symbolizing the past crossed first, followed by a modern train ushering in the future.

Today, the Bolesławiec viaduct is a key part of Poland’s railway line no. 282 (Miłkowice – Jasień), forming part of the international E30 transport corridor linking Dresden and Berlin with Wrocław and beyond. Dozens of trains pass over it daily. Occasionally, vintage trains also return, offering a magical spectacle that transports viewers back in time.

3D Model

The documentation of this viaduct has evolved with technology – from 19th-century sketches to modern photogrammetry. Today, you can explore it interactively through this 3D model.

Created using photogrammetry – the technique of building 3D models from photos – this model is based on 1100 drone images. Over 60% of the photos were taken around the most scenic and architecturally interesting part: the section above the Bóbr River. This area was recreated with high precision, capturing the texture of sandstone blocks, arches, and structural details.

The central section and the far end of the viaduct were modeled with lower accuracy for presentation purposes. They retain the correct proportions and general form, helping users understand the viaduct’s scale and placement in the landscape, while focusing attention on the most detailed, immersive section.