The 1 July 1916 Motography announced that director Lynn Reynolds had begun filming his own story, The Girl of Lost Lake, and the 15 July 1916 Moving Picture World declared that the movie was completed. This is one of several films that Lynn Reynolds made with Myrtle Gonzalez, Val Paul, and other cast members. See also The Secret of the Swamp (1916).
       The 15 July 1916 Moving Picture Weekly ran a photo of the cast and crew of The Girl of Lost Lake, including Myrtle Gonzalez and her pet owl, claiming that they were filming at "Bear Lake" in "lower California." Two weeks later, the same magazine reported that the company was staying at Pine Knot Lodge at Big Bear Lake Camp, where Universal crews regularly filmed. An item stated that "this week" the company was leaving "for a sojourn of some fifteen days, during which time they will film scenes for The Girl of Lost Lake." The 5 August 1916 Moving Picture World mentioned that actress Jessie Martin was recovering from bronchitis after nearly drowning in the cold waters of Bear Lake and being rescued by Fred Church, while making The Girl of Lost Lake.
       However, according to the 19 August 1916 Moving Picture World, filming took place several hundred miles north at the real Lost Lake in the Sierra Nevadas, not far from Lake Tahoe: "Lost Lake is an actuality, situated high among the Sierras—but the romance is only partly legendary to the location....Nearly two weeks were spent in the Sierras by the Bluebird company, and the realistic locations provided by nature for the proper framing of the narrative will be one of the conspicuous features of the production. There are comparatively few interiors, most of the action taking place in what the robust writers call 'God's great out-of-doors.'" Given that Big Bear is much closer to Los Angeles, and was given as the location in reports concurrent with filming, it is likely that the Sierra Nevada claims are incorrect.
       The 26 August 1916 Moving Picture Weekly condensed the scenario of The Girl of Lost Lake into a photo-illustrated, two-page short story.
       The Girl of Lost Lake was one of five feature films Reynolds made with the same cast and crew while traveling around California. See also The End of the Rainbow, It Happened in Honolulu, The Secret of the Swamp, and A Romance of Billy Goat Hill (all 1916).
       The National Film Preservation Board (NFPB) included this film on its list of Lost U.S. Silent Feature Films as of February 2021.