After the 1798 French invasion and under the Helvetic Republic, Bremgarten was granted a town council and became part of the District of Bern. The first bridge over the Aare at Bremgarten was the Neubrügg which was built in 1466. However, the town remained isolated from the major roads leading to Bern until the 20th century. In 1921, the much larger Seftausteg bridge was built next to the Neubrügg. This was followed in 1928 by the Felsenaubrücke which was built by the army as a wooden bridge in 1929 and rebuilt as a solid-web girder bridge made of packed concrete in 1949.