As the architect of the prefecture, he was able to design not only the fountain but also the facades of the new buildings around it, giving coherence to the square, but he also had to deal with the demands of the prefet and city administration, which was paying for the project.
The next design made by Davioud in 1856 provided the architectural structure of the fountain; a facade divided into four horizontal levels, similar to a triumphal arch, with four Corinthian columns on high socles framing the central niche.
As the revised site was just off the axis of the bridge, Davioud created a visual compromise in a series of shallow bowed basins through which the water issuing from the rock under the supine body of Saint Michael's adversary spills.
The water ends in a basin sunk into street level, with a curving front edge that softens the line of the monument's architectural base.
This provoked furious opposition from the opponents of Napoleon III, so later in 1858 Davioud proposed that the central figure be the Archangel Michael wrestling with the devil.
On September 5, Davioud wrote an urgent letter to the Director of the Municipal Service of Promenades and Plantations: "A crowd of unarmed workers have just come to the Fontaine Saint-Michel..they apparently want to attack the fountain and want to deface the eagles and inscriptions on the upper part.
Much attention was given to the different colors: The critic of Le Monde Illustré wrote: "the monument constitutes, in sum, a venture into polychrome architecture such as one can see in Rome, where fountains of the same style were created by artists of the 18th century.