Lake Polyfytos Bridge

West Macedonia. The bridge over the Polyphytos artificial lake of the river Aliakmonas in Kozani regional unit.

The Servia High Bridge (Greek: Υψηλή Γέφυρα Σερβίων, romanized: Ypsili Gefyra Servion) is one of the longest bridges in Greece, with a length of 1,372 m.^[1] Construction began in 1972 along with the Ypsili Gefyra Servion artificial lake and was completed in 1975.

Designed by Riccardo Morandi, was constructed from a joint venture Xekte SA–Skapaneus SA.^[2]

The bridge is a part of the GR-3/E65 (Athens - Lamia - Larissa - Kozani - Florina) and is located 15 km southeast of the city of Kozani and 5 km northwest of Servia. It is one of the two bridges of the lake; the other is the to the southwest near Aiani and is smaller, with 615 m length.

Structural issues raised in 2020[]

In early 2020, and after a visual inspection conducted by professor Stergios Mitoulis of the University of Surrey, it was found that ageing, environmental stressors and increase in the traffic loads on the bridge lead to safety issues. Amid these concerns traffic restrictions were forced on the bridge. These preventative measures aimed at reducing the load on the bridge and included banning vehicles weighing over 50 tonnes and reducing the vehicle speed limit to 40 kilometers per hour.^[3]

Professor Mitoulis noted following the inspection of the bridge that there was “vertical displacement of some of the bridge spans that are visible” and that “central simply supported segments of the deck are not well connected to the balanced cantilever part of the deck and there is a risk of falling.” Professor Mitoulis also explained that the simply supported spans need to be connected to the balanced cantilevers, whilst the movement of the latter seems to be the main issue that needs urgently addressing.^[4]

The bridge had been inspected in the past from the relevant ministry in 1995 after the Kozani earthquake, and again in 2012.^[5]