Bridge structures in the north of Algeria are at risk from aging, leading to structural
deterioration from service demands from increasing traffic and heavier loads, from aggressive environmental
attack and other physical mechanisms. The paper present the information from the in situ assessment of
reinforced concrete structures in marine environment. The test procedure used and the results are presented.
These results will serve as the basis for the application of the probabilistic model, in an attempt to evaluate the
service life of these structures. In this paper the assessment of reliability profiles for reinforced concrete bridges
exposed to chloride attack is discussed. The stochastic service lifetime of an existing RC highway bridge is
estimated. The durability investigations of the structures are presented.