Fish Rock (formerly, Fishrock and Conways Landing) is an unincorporated community in Mendocino County, California. It is located 4 miles northwest of Gualala. The Conways Landing post office opened in 1870, changed its name to Fish Rock in 1871, closed in 1873, re-opened in 1885, moved in 1908, and closed for good in 1910.
All the above I got from Wiki. The bottom line is it was never very big. Google did give me a link to a really neat map:
So, the likelihood of finding a pic of Fish Rock is pretty small. Well, one has turned up:
Alas I have NO info of when it was taken.