Submarine pipelines that approach the shore in open sea sand beaches are affected by the constant variations in beach profile. Stresses due to the changes in pipe support conditions may be cause for concern in aging pipelines if the shore approach profile varies considerably. This paper describes the evaluation of stresses in two pipelines installed in such a region. Initially, stresses were measured by the hole-drilling strain gage method, in five sections at 120° intervals. Sections that are just above the sea level and completely immersed in the upper tide were selected for these measurements. Stresses were then monitored in the same sections for one year with fiber Bragg grating (FBG) extensometers. After one year, pipe stresses were again measured by hole-drilling in selected positions. It was demonstrated that optical extensometers are a viable alternative to monitor slowly varying stresses over long periods of time in aggressive environments. It was also demonstrated that stresses in the two pipelines are within acceptable limits.