Lake sediments are excellent archives of environmental and climate changes as well as record of human impact on lake- and River- systems. This study focuses on the south-west part of Lake Biel basin, where the lake sedimentation was naturally mainly controlled by autochthonous sedimentation, and since the Aare River deviation through the Hagneck canal in 1878, is now under the strong influence of water and sediment input from this River catchment. This study is based on a multiproxy analysis (magnetic susceptibility, density, grain size, elemental composition by X-ray fluorescence analysis) of a 10 m long composite sediment sequence, which was built from two long cores retrieved with the ETH Zurich/Eawag Uwitec floating platform system cored from a 52 m water depth in September 2011. The top sediment starts at 1975 AD and spans the last 7500 years. Lake Biel sediment record shows a clear evidence of the Aare deviation in 1878, and its response to such hydrological change is identified by different proxies.