The Dezful historical bridge, a prominent example of Sassanid architecture in the city, is characterized by its stone foundations and unique structural features. This research explores the restoration and reconstruction methods applied to the spans of the Dezful historical bridge, with a focus on preserving the structural authenticity over time. The research method is historical-interpretive, with data collection through both library and field research. The findings indicate a wide variety of restoration and reconstruction techniques employed throughout history. The key research question is: What is the diversity of restoration methods for the foundations of the Dezful historical bridge, and how have these methods impacted the bridge's structural authenticity and historical value over time? Notable techniques include the use of simple cement coatings, brick patterns, plaster and lime coatings with brick patterns, and a combination of stone and brick materials. Additionally, the types of stones used in the reconstruction show variations in appearance, texture, dimensions, and arrangement. This diversity in reconstruction methods has resulted in an inappropriate visual appearance for the bridge's structure, negatively impacting its authenticity and historical value. The research concludes that the lack of a unified restoration approach may diminish its significance as a key symbol of the Sassanid period, emphasizing the need for greater attention to consistency in restoration practices and the preservation of the building’s original features.