Where was Green Dolphin Street filmed?

1947 film by Victor Saville

Green Dolphin Street (1947) was filmed in Humboldt County and Upper Klamath Lake, 2 places named in its Wikipedia article, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data

Places per Wikipedia's article

The Wikipedia article names 2 places. Each links to the sentence that says so.