Zubizuri

Listen to your footsteps first. Out here they do not sound like stone or wood. They sound duller, softer, and a little hollow, because under your feet is a deck made of glass and steel, now mostly covered by a dark non-slip mat. Above you a white arch leans out over the water. Below, the Nervión river moves slowly towards the sea. On a grey Bilbao morning the whole bridge seems to hold the light that the sky will not give.

This is Zubizuri. The name is Basque, and it means simply 'white bridge'. Basque is the old language of this region, and it is not related to Spanish or to any other language in Europe. The bridge opened in 1997. It was designed by the Valencian architect and engineer Santiago Calatrava, who became known for structures that look like skeletons, wings or drawn bows. Here he used a footbridge to link two parts of a city that was in the middle of a big change.

To understand why this bridge matters, picture the river as it was a few decades earlier. For more than a century this stretch of the Nervión was industrial. There were shipyards, docks, warehouses, rail lines and iron works. Bilbao grew rich on iron ore and steel, and the river carried that trade. When heavy industry declined in the late twentieth century, the waterfront was left with empty ground, polluted water and a city searching for a new identity.

The answer was a bold programme of urban renewal. The city cleaned the river, opened new public spaces along the banks, and invited well-known architects to build. Zubizuri came in the same year as the Guggenheim Museum, which stands a short walk downstream. Together they sent a clear message. Bilbao would no longer turn its back to the river. It would cross it on foot, in the open, and in a modern style.

Now look up at the arch. It does not rise straight from the bridge. It tilts to one side, leaning out over the water like a sail filled with wind. Thin steel cables hang from it and hold up the deck. The deck itself is also curved, so the path you walk on bends gently in plan. The arch pulls one way, the walkway curves the other way, and the cables connect them. It is a balanced system, but it is designed to look as if it is in motion.

Here is a detail that many visitors miss. Calatrava chose glass blocks for the walking surface. The idea was elegant. The pale deck would match the white steel, and at night light could pass through it. But Bilbao is a rainy city, known for a fine, steady drizzle that locals call sirimiri. Wet glass is slippery. Over the years, many people slipped and fell on this bridge, and the city eventually covered most of the glass with the dark mat you see today.

So, the bridge you are standing on is not quite the bridge the architect drew. Look down at the edges, and you may still see the glass where the mat stops. It is a small lesson in how buildings meet real life. A beautiful idea on paper has to survive rain, crowds, bicycles and everyday shoes. In Bilbao the weather had the final word, and the city chose safety over the original surface.

There is a second story, and it caused an even bigger argument. Look towards the left bank, on the Uribitarte side. Two tall towers rise there. They are known as Isozaki Atea, the Isozaki Gate, after the Japanese architect Arata Isozaki. When that development was built, a new walkway was added to connect the end of Zubizuri directly with the towers. Calatrava had not designed it. He felt that the addition changed his work without his permission.

The architect took the case to court. The judges did not order the city to remove the walkway, but they accepted that his moral rights as an author mattered, and he received compensation. The case was discussed far beyond Spain. It raised a hard question. When a city pays for a bridge, does it own the design completely? Or does the creator keep some say over how the work changes later? Bilbao and Calatrava gave one answer here, but the debate continues in other cities.

Walk to the right bank, the Campo Volantín side, and you reach the other end. Here the bridge comes down with a ramp and steps along the riverside promenade. This bank is quieter, with older houses, trees and a long walkway beside the water. Joggers pass, people walk dogs, and older residents sit on benches and talk. The bridge feels less like a monument here and more like a daily shortcut, which is exactly what a footbridge should be.

Stop in the middle of the span and turn slowly around. Downstream, you can follow the river towards the titanium curves of the Guggenheim. Upstream, the banks lead back towards the older heart of the city. Hills covered in green rise behind the rooftops on both sides. Bilbao sits in a narrow valley, and from this point you can feel how the river and the hills shaped it. The city had little flat land, so the water was always its main road.

The bridge changes with the weather and the hour. In soft rain, the white steel looks almost silver, and the river turns the colour of slate. In sunshine, the arch throws thin shadows of its cables across the deck, and they move as you walk. After dark, the structure is lit, and the white curve stands out against the black water. Many photographers prefer the riverbanks to the bridge itself, because from there you can see the whole lean of the arch.

Before you leave, put your hand on the railing for a moment. Feel the cool metal and the slight hum of footsteps around you. Listen to the gulls above the river and the bicycles on the promenade. This bridge was built for an ordinary act, crossing from one side to the other. As you walk off the deck, look back once. The white arch is still leaning over the water, as if the whole structure is about to move downstream.