Thanks again, to all of you, for all the wonderful information and advice. I think that I am beginning to get a "picture" of what Sacramento, California must have been like back in the 1920s.
Although not a complete dissolute it does seem as though a penniless "transient" such as my father was then, would of necessity have lived in the rough side of town. Unfortunately he could not have featured in Sacramento in the 1920 census as he had not arrived in the US.
I have his note that on 3rd June 1925 he was on the "OVERLAND LTD -bound for 'Frisco" .
I have a record of his being accepted as a legal immigrant from Vancouver via Seattle to San Francisco on the 10th April 1927.
I already have also seen his entry in the 1930 census when he was living (Legitimately by then)at W181 St., in New York City.
That photo, purported to be of Sacramento Docks 1900 -1920, does seem authentic as it features a bridge and the dock walls which I also noted in many other photos on some of those Sacramento sites that you sent and posted.
I will look up the site that Ms Shaljean posted this afternoon and thanks to her for doing so.