Skip to content
Hailuoto Causeway FAQ
  • The plan is to build a causeway between Riutunkari in Oulu and Huikku on Hailuoto Island. The causeway will replace the current ferry service.

    The causeway will be approximately 8.4 kilometres long, and it will consist of a road running on top of an embankment and long bridges in Huikku and Riutunkari. The bridge in Huikku will be located approximately one kilometre from Hailuoto. The total length of the bridge will be approximately 770 metres, and its vertical under-clearance will be 18 metres where it crosses the shipping channel. The bridge in Riutunkari will be located to the north of the current ferry port. The total length of the bridge will be approximately 740 metres, and the vertical under-clearance of its central opening will be five metres.


  • The Parliament of Finland has decided that the Hailuoto causeway will not be implemented as a Private-Public Partnership project but instead it will be done as a budget-based project.

    Project preparation will continue under the alliance model, which is based on a partnership where the various parties form a joint project organisation. Risks and benefits are to be divided be-tween the parties in predetermined proportions.

    The Finnish Transport Infrastructure Agency began preparing the project as a Private-Public Partnership (PPP) project in 2018, but it proved impossible to put the project to competitive tender because a complaint against its water permit was filed with the Vaasa Administrative Court in March 2020. The complaint against the water permit decision is still in process in Administrative Court.

  • The causeway will make Hailuoto more easily accessible nationally and regionally, enable better passenger and goods transport links to the island and local businesses, and widen the working area of Hailuoto residents.

    The causeway will make Hailuoto equal with other municipalities in the Oulu region in terms of transport. The planned capacity of the causeway is also able to accommodate a considerably greater increase in transport volumes than forecast. The causeway enables meeting the objectives set for private and public transport, logistics and pedestrian and bicycle traffic.

  • The causeway will be located to the north of the current ferry route.

  • The total length of the causeway will be 8.4 kilometres.

  • The aim has been to design the causeway to fit in with its surroundings as well as possible. A wide range of new environmental surveys and flow modelling were carried out and previous studies consulted during the planning process. The area’s vulnerable ecosystem has been taken into account in the designs. The challenging sea conditions were also factored into the structural solutions.

  • Direct impacts on the sea and its immediate surroundings will be minor. The project will change the environment locally but will not cause any notable harm to protected species or habitats. Protecting the environment is one of the most important objectives of risk management during the project.

  • The authorization given to the project by the Finnish Parliament is EUR 96 million.
    The project’s benefit-cost ratio is 1.64, which is the factor by which the money invested in the project will be returned to society through the benefits achieved.

  • The current ferry service is not meeting its economic objectives, and its annual operating and maintenance costs amount to approximately EUR 6 million. Continuing to operate the ferry service would require investments in new ferries and more services over the next few years.

    The ferry service causes businesses on Hailuoto to incur extra expenses in the form of logistics costs, for example. The ferry service also makes businesses located on Hailuoto less competitive.