A royal decree signed on 29 April 1927 ordered the correction and replanting of an entire river basin in Malaga. The Guadalmedina is a highly seasonal river whose urban channel is usually dry, and upstream reservoirs now regulate the basin and reduce the flood surges that once reached the city. The problem was never the water. It was the slopes.
Why does the Guadalmedina river have no water? Because its basin is regulated upstream by dams built after the great floods. The Agujero reservoir was finished in July 1924 and El Limonero between 1979 and 1983, a few kilometres further down the same river. The flood of 23 September 1907 killed 21 people and took the Aurora, Santo Domingo and railway bridges.
The Agujero dam was finished in July 1924, Manuel Jiménez Lombardo drew up his scheme in 1908, and El Limonero was built between 1979 and 1983, with aerial photographs from 1982 recording the work. Between those dates the flood of 1907 killed 21 people in the districts along the channel.
The slopes, and the sixteenth century
The river was not always a hazard. What changed was not the watercourse but its catchment.
Deforestation began in the sixteenth century, after Malaga passed to the Crown of Castile. Once the original woodland went, the slopes were left without protection against torrential rainfall, and that is where the erosion starts which turns a heavy storm into a surge capable of taking bridges with it.
Before that the river behaved differently: it ran gently, dried out more or less in summer, watered the market gardens around the city and filled the wells that supplied its population. That is why the basin still matters for understanding the city’s water, a subject covered in where Malaga’s water comes from, and why the Montes de Málaga natural park, on the left bank of this basin, began life as a reforestation scheme rather than a recreational space.
The dams, and one decree that was not a dam
The Agujero reservoir appears as finished in July 1924, according to the culture department’s archive, and its project had been presented in 1908 by the Malaga engineer Manuel Jiménez Lombardo.
The least known piece was not a dam at all. A royal decree of 29 April 1927 approved the correction and replanting of the Guadalmedina basin, an intervention on the territory rather than the channel.
The last large piece is El Limonero, on the same river a few kilometres below the Agujero. Work ran from 1979 to 1983, and the archive holds aerial photographs from 1982 documenting its construction.
One limit worth declaring: no capacity, height or official use figures for El Limonero appear here, because the numbers in circulation disagree and none was verified against an official record. What is documented is the sequence and its dates.
The 2026 agreement, and a sequence still running
A hydraulic study completed in April 2025 sits behind the most recent move on this channel. Its stated objective is to minimise flood risk in a densely populated urban area, by improving the channel’s capacity and managing sediment while adapting to the effects of climate change.
The Andalusian Consejo de Gobierno turned that into an agreement declaring the works of interest to the Autonomous Community, covering the 1.70 kilometres between the Armiñán and Perchel bridges, on 11 March 2026.
Worth holding onto while looking down from a bridge: what began in 1907 did not close in 1983.
Reading the channel from the bridge
Three things are visible without any technical knowledge, and between them they tell the whole story.
- The width of the channel, out of proportion for a river with no water, because it is sized for the surge and not the ordinary flow.
- The retaining walls, which turn a river into an urban canal and are the physical translation of the orders that followed 1907.
- The position of the districts: El Perchel and La Trinidad developed on the far side of the river, whose course marked the edge of the walled city.
That emptiness has everyday consequences. It is the reference line separating the centre from the far bank, and it turns up more often than visitors expect.
The Tribuna de los Pobres, one of the best-known free vantage points of Holy Week, connects with the left bank of the Guadalmedina, as explained in Holy Week in Malaga. Crossing the channel is also what makes it possible to frame the whole cathedral with Gibralfaro behind it, a detail noted in the viewpoints of Malaga. And it marks the edge of the Soho, between the Alameda, Muelle Heredia and the channel itself, covered in its murals.
For the wider picture of what the city holds, the overview is in the highlights of Malaga, and the network that crosses both banks is in getting around Malaga.
What the 1907 flood took with it
That regulation exists for a reason with a date: 23 September 1907.
The Guadalmedina crosses the Montes de Málaga park before reaching the Mediterranean in the city itself, and it has historically divided the urban area in two.
The river has historically split the city in two, according to the Archivo Histórico Provincial de Málaga, which holds a documentary collection devoted to it. On one bank sits the historic centre, on the other the districts of El Perchel and La Trinidad, connected for centuries by a handful of bridges. The same collection notes that “the Guadalmedina has caused several catastrophes in the city”.
On 23 September 1907 the river failed to absorb a cloudburst and broke its banks. Contemporary accounts record that the surge destroyed the Aurora, Santo Domingo and railway bridges, killed 21 people and wrecked homes, shops and workshops, with El Perchel and La Trinidad among the worst-hit districts.
Alfonso XIII ordered works to prevent further flooding, and that instruction opens the century of engineering behind today’s channel.
Worth separating the sources: the casualty figure and the lost bridges come from consistent contemporary accounts rather than an archive document read for this article. What is held publicly is the photographic record of the flood taken by the French consul.
Frequently asked questions about the Guadalmedina
Why does the Guadalmedina have no water?
Because its basin is regulated upstream by dams built after the great floods. The Agujero reservoir was finished in July 1924 and El Limonero was built between 1979 and 1983, a few kilometres further down the same river.
What happened in the 1907 flood?
The surge of 23 September swept away the Aurora, Santo Domingo and railway bridges and killed 21 people according to contemporary accounts, wrecking homes and businesses in El Perchel and La Trinidad. Alfonso XIII then ordered works to prevent further flooding.
What caused the Guadalmedina floods?
A torrential rainfall regime meeting a basin that had lost its woodland. Deforestation began in the sixteenth century, after Malaga passed to the Crown of Castile, and without that cover the slopes shed water and sediment straight into the channel.
Where can I see photos of the Malaga floods?
At the Archivo Histórico Provincial de Málaga, which holds and publishes collections on the river, including photographs of the 1907 flood taken by the French consul, within the documentary set Guadalmedina, the river of the city.
Can you walk into the Guadalmedina riverbed?
The channel is a regulated watercourse rather than a public park, and access depends on the works and signage in force at any given time. The usual way to experience it is from the bridges that link the historic centre with El Perchel and La Trinidad.
Which neighbourhoods does the river separate?
The channel divides the historic centre from the districts on the far bank, among them El Perchel and La Trinidad, which were also the worst hit in 1907. The provincial archive records that the river has historically split the city in two.
The river is not dry by accident. It is dry because twenty-one deaths made it necessary.