 This paper proposes a new method for estimating time series of inland water levels using satellite altimetry data. This method uses an extended outlier rejection algorithm combined with a Kalman filter to combine multiple missions altimeter datasets, including Invisit, ERS-2, JSON-1, JSON-2, Topex slash Poseidon, and Serol slash Altica. The resulting time series are then compared to in situ data and other altimeter databases, showing improved accuracy when compared to other altimeter databases. This article was authored by C. Schwatka, D. Dettmuring, W. Bosch, and others.