Among his important works are a series of paintings of the River Thames, mostly around Hampton Court, executed in 1874, and landscapes depicting places in or near Moret-sur-Loing. The notable paintings of the Seine and its bridges in the former suburbs of Paris are like many of his landscapes, characterized by tranquillity, in pale shades of green, pink, purple, dusty blue and cream. Over the years Sisleys power of expression and colour intensity increased.
Among Sisleys best-known works are Street in Moret and Sand Heaps, both owned by the Art Institute of Chicago, and The Bridge at Moret-sur-Loing, shown at Musée dOrsay, Paris. Allée des peupliers de Moret (The Lane of Poplars at Moret) has been stolen three times from the Musée des Beaux-Arts in Nice – once in 1978 when on loan in Marseilles (recovered a few days later in the citys sewers), again in 1998 (when the museums curator was convicted of the theft and jailed for five years with two accomplices) and finally in August 2007 (on 4 June 2008 French police recovered it and three other stolen paintings from a van in Marseilles).