I saw a painting of this bridge in the window of an artshop. Fortunately the painter titled his work simply "Schemerlbrücke". A bit of searching on the web at night and the next morning I was on the U-bahn and S-bahn to Nußdorf where the bridge is right beside the station.
Writing on the statue with the lion : ''viribus unitis'' = a well known Latin phrase = ''with united forces''
Motto of the house of Habsburg-Lorraine (Franz Joseph I ; 18 August 1830 – 21 November 1916, Emperor of Austria and King of Hungary).