I presume that's Athol Street? Incidentally there is a display of old photos at Jurby Transport Museum - tomorrow, Sunday (10am - 4pm), is the last day.
Sorry, would have been helpful if I had provide the info and where I had taken it from!
"The triumphal arch, erected in Athol Street to greet the arrival of Lieut. Governor Pigott, 14th February, 1861. Note the greeting in Manx."
http://www.douglas.gov.im/GalleryShowCat.asp?Cat=Streets&ID=53