His chief accomplishment was securing the erection of the Second Street Bridge across the Los Angeles River, which was inaugurated by President William Howard Taft in 1909.

After moving to Los Angeles, he formed a house- and sign-painting business partnership in June 1892 with Paul H. Fitzgerald under the name Star Sign Company.

[4] In November 1899, he was physically assaulted by two other sign painters, Albert M. Imelli and Otto Wieben, on the street in front of Dromgold's business in the Byrne Block;[5] a crowd gathered and separated the men, a policeman was called, the two assailants were arrested and they were fined $15 each in court.

[8] As president of the East Side Improvement Association, he "fathered" a bridge and viaduct plan for connecting Pasadena and Downey avenues and Buena Vista Street (the present North Broadway).

[10] His chief accomplishment was securing the erection of the Second Street Bridge across the Los Angeles River, which was inaugurated by President William Howard Taft in 1909.

He was also one of the council members who voted in favor of the Owens River Project to bring water to Los Angeles from East Central California.

In a similar vein, Dromgold ordered an ordinance prepared that would end the common practice of the city vacating portions of a public street simply because an adjacent property owner wanted to build on it.