The Agencia Vasca del Agua (URA) published the tender for flood protection works on the Río Cadagua in Sodupe (municipality of Güeñes, Bizkaia) on 12 August 2026. The plans involve replacing the existing puente Galarraga with a single-span bridge without supports in the riverbed, and removing part of the azud de la Conchita, leaving a 23-metre-wide opening at its base. The estimated budget is 5,212,663.18 euros including VAT; the works are scheduled to take 15 months. Tenders may be submitted until 15 September 2026.
Rationale and objectives: According to URA, hydraulic studies show that both the bridge deck and the weir contribute to higher water levels and restrict flow capacity, particularly near the confluence with the Río Herrerías The project aims to protect against a flood with a statistical return period of 50 years, in line with the requirements of the current flood risk management plan for the district. It is also intended to prevent impacts on nearby railway infrastructure in Adif and improve the passage of fish, sediment and debris.
Technical details: The azud de la Conchita was originally 3.59 metres high and 1.50 metres wide at its base. It was partially opened in 2023 to improve ecological continuity; the planned widening to 23 metres at the base is intended to significantly increase flow capacity. The existing puente Galarraga (around 30 metres long, with three arches) will be replaced by a new structure with a steel arch and box girders. Removing supports from the river channel will reduce the risk of water backing up and debris accumulating during floods.
Process and impacts: URA is conducting the procedure; the appointed companies will be responsible for the award and construction. The works are expected to affect riverbanks and involve temporary traffic restrictions. The Agencia Vasca del Agua has announced accompanying measures to reduce noise, keep access routes secure and protect neighbouring infrastructure. Statements about a completion date beyond the stated construction period are forecasts; binding dates will only be set once the contract has been awarded.
Context: The project is part of ongoing measures to reduce flood risk in the Río Cadagua catchment. Alongside increased flow capacity, ecological and operational considerations – from fish migration to the stability of nearby transport infrastructure – are to be addressed through an integrated approach.
Editor: Mira Cadena (Article created with AI assistance).