Crossing the Impossible River: Mao Yisheng and China’s First Modern Bridge

Today, we’ll talk about Mao Yisheng, China’s pioneering bridge engineer, who devoted his life to building bridges that carried a nation toward modernity, and how his most famous bridge over the Qiantang River became a powerful symbol of science, sacrifice, and national survival.

Transcript

Crossing the Impossible River: Mao Yisheng and China’s First Modern Bridge

Today, we’ll talk about Mao Yisheng, China’s pioneering bridge engineer, who devoted his life to building bridges that carried a nation toward modernity, and how his most famous bridge over the Qiantang River became a powerful symbol of science, sacrifice, and national survival.

On the Qiantang River in Hangzhou, capital of Zhejiang Province, the water surges with astonishing force. When the tidal bore arrives, it roars forward like a charging army, shaking the air with thunderous sound. For centuries, this wild and unpredictable river was regarded as an insurmountable natural barrier. Local folks used to say building a bridge over the Qiantang River was impossible. But in the early morning hours of September 26, 1937, the impossible became reality. At four o’clock, the whistle of a steam locomotive pierced the darkness as the first train rolled steadily across a steel bridge stretching more than 1,400 meters over the river. 

The headlight illuminated a solitary figure standing at the bridge’s end. He was slim and scholarly in appearance. Behind his glasses were eyes that glistened with excitement, but also with resolve. This man was Mao Yisheng, chief designer and builder of the bridge. He also carried a briefcase concealing top-secret documents with detailed diagrams showing where explosives had been pre-installed within the bridge’s critical structures. From the moment the bridge opened to traffic, it carried a tragic responsibility. If necessary, it would have to be destroyed by the very man who had devoted more than a thousand days and nights of his life to build it.

This dramatic moment was no accident of history. It reflected the central tension of Mao Yisheng’s life. He used science and perseverance to build bridges leading China toward modernity, yet at the most critical moment of national survival, he had to prepare himself to destroy his own greatest achievement. He believed deeply in science and engineering, but he never separated his personal fate from that of his country. From a boy who vowed to build safe bridges after witnessing tragedy, to a world-renowned bridge engineer, every step of his life followed the pulse of China’s long struggle from weakness to self-reliance.

Mao Yisheng was born on January 9, 1896, in Zhenjiang, Jiangsu Province, into an open-minded gentry family. His grandfather was a successful scholar in the late Qing dynasty who embraced reformist ideas, and his father valued modern education. As a result, Mao grew up immersed in both classical Chinese learning and new subjects such as mathematics and science. Yet the event that truly shaped his life came unexpectedly. 

In 1906, during the Dragon Boat Festival, thousands gathered along the Qinhuai River in Nanjing to watch the races. The ten-year-old Mao Yisheng was ill and confined to bed, spared from attending. That evening, his friends returned in panic with terrible news. The Wende Bridge had collapsed under the weight of the crowd. Many spectators had fallen into the river, and numerous lives were lost. His mother, shaken, said to him, “It’s lucky you didn’t go.” Mao sat up in bed, clenched his fists, and replied with unusual determination, “When I grow up, I will build the strongest, safest bridges, so that tragedies like this never happen again.” From that moment, the idea of bridge-building became his life’s mission.

To fulfill that promise, Mao became an exceptionally diligent student. In 1911, at the age of fifteen, he traveled north to enroll in the civil engineering program at Tangshan Railway and Mining College. Shortly after he entered the school, the 1911 Revolution broke out. Many students, fueled by patriotism, abandoned their studies to join the uprising. Mao, too, felt the pull of history, but he remembered the victims beneath the Wende Bridge and the oath he had made. He chose to remain at his desk. He believed that a nation needed not only soldiers with rifles, but also builders with knowledge and skill. During five years at Tangshan, he filled more than two hundred notebooks with nearly ten million characters of handwritten notes. Stacked together, they stood taller than he did. He graduated in 1916 at the top of his class and soon earned a government-funded scholarship to study in the United States, sailing across the Pacific and crossing a continent to attend Cornell University in upstate New York.

Life in a foreign land was demanding, but Mao thrived. His discipline and talent quickly impressed his professors. In just one year, he completed his master’s degree, setting a record at Cornell. His advisor, a renowned bridge expert, remarked admiringly that the young man from China was truly exceptional. Mao then entered Carnegie Institute of Technology to pursue a doctorate. Determined to unite theory with practice, he attended classes by day and worked nights at a bridge engineering firm, sometimes staying awake through the night. 

In 1919, his doctoral dissertation on secondary stresses in bridge trusses reached the international frontier of the field. It earned him the institute’s first-ever doctorate in engineering, and its theoretical insights became widely known as “Mao’s Law” in engineering circles. Prestigious American companies offered him lucrative positions, but he declined without hesitation. By the end of that year, he returned home, driven by the conviction that science could save the nation.

What he found upon his return was sobering. China was beset by internal turmoil and external threats. Infrastructure was painfully backward. Across the great rivers of the country, there was not a single modern bridge designed and built independently by Chinese engineers. Large projects were monopolized by foreign firms that charged exorbitant fees and openly doubted Chinese capabilities. Mao taught at several universities, introducing the most advanced engineering theories to his students. His lectures were lively and vivid. He explained structural mechanics by comparing them to carrying loads with shoulder poles or stacking building blocks, making complex ideas accessible and memorable. Yet his deepest ambition remained unfulfilled. He longed to build a bridge that would prove China’s ability to stand on its own.

That opportunity came in 1933, when the Zhejiang provincial government decided to construct a bridge over the Qiantang River to link major railway lines. The challenge was daunting. The riverbed consisted of more than forty meters of shifting sand, with violent tides and treacherous currents. It was known locally as a river without a bottom. Foreign experts had already declared the project impossible. When Mao was invited to lead the effort, many friends and family urged him to refuse. Failure would destroy his reputation. After studying bridges for two decades, he said, he had been waiting for this very moment.

Construction began on November 11, 1934, and difficulties emerged immediately. Driving piles into the deep sand was painfully slow using conventional methods. At that rate, the foundation alone would take years. One day, Mao noticed children washing holes into sand with streams of water. Inspired, he devised the “water jetting” method, using high-pressure water to loosen the sand before inserting piles. Efficiency increased thirtyfold. Later, when installing massive steel girders, he adapted the ancient principle of floating transport, using the rise and fall of the tide to position them precisely. Foreign engineers watching nearby were astonished. For the most critical piers, Mao adopted the compressed air caisson method, requiring workers to operate underwater in high-pressure conditions. 

The work was dangerous and exhausting. Mao frequently entered the caissons himself, inspecting conditions and working alongside laborers. At the peak of construction, he moved his family into a makeshift hut near the site, remaining on constant watch. His wife endured enormous stress and suffered from severe depression. Mao felt deep guilt, yet believed he had no choice but to dedicate himself completely to the bridge.

As the project neared completion, war clouds gathered. After the Marco Polo Bridge Incident in July 1937, full-scale war erupted. Japanese aircraft began bombing the area. Construction continued under constant threat. Mao ordered camouflage screens erected over the bridge. When air raids came, workers took shelter; when planes left, they rushed back to work. He declared, “The war will be won, and this bridge must be finished.” Against all odds, the bridge opened two months ahead of schedule on September 26, 1937. There was no ceremony, no flowers, only trains carrying troops, supplies, and refugees southward. In just three months, countless people and vast quantities of material crossed the bridge, preserving vital strength for the prolonged war.

Yet Mao knew what lay ahead. Under secret orders, he had designed the bridge with concealed channels for explosives. He later wrote that drawing the demolition plans felt like being forced to kill one’s own child. On December 23, 1937, as enemy forces approached, the order came. Mao took one final walk across the bridge he had built with his life’s devotion, then triggered the explosion. The bridge fell in smoke and fire. That night, he wrote eight characters in his diary. Translated it says, “The war will be won. This bridge will be rebuilt.”

For eight years, Mao carried the bridge’s drawings as he worked in the interior of China, designing infrastructure and training engineers. He rejected all attempts at collaboration with occupying forces. After victory in 1945, he returned to Hangzhou. In 1948, under extremely difficult conditions, he began rebuilding the bridge. In 1953, it reopened, fully restored to life. Watching trains pass over it once more, Mao felt the weight of history lift from his shoulders.

In the decades that followed, Mao Yisheng played a vital role in China’s reconstruction. He led major research institutions, advised on landmark projects such as the Wuhan Yangtze River Bridge, and devoted himself to education and science communication. His writings on bridges were elegant and approachable, inspiring generations of young readers. He often said that bridges were roads in the air, and education was the strongest bridge of all.

Mao Yisheng passed away in 1989 at the ripe old age of ninety-three. His life, like a great bridge, connected suffering and hope, tradition and modernity, China and the world. The Qiantang River Bridge still stands against the tide, a monument not only of steel, but of conscience, sacrifice, and an unyielding belief that knowledge, guided by responsibility, can change the fate of a nation.

Well, that’s the end of our podcast. Our theme music is by the famous film score composer Roc Chen. We want to thank our writer Liu Wen, translator Du Guodong, and copy editor Pu Ren. And thank you for listening. We hope you enjoyed it, and if you did, please tell a friend so they, too, can understand The Context.