With Fisherman Joe's rising income, his social class rose exponentially, putting him amongst the high-class Company Owners. He even moved his family into a mansion in the elite part of town.
While preparing to get in his hot tub one day, Joe thought about how lonely it is at the top of the social chain it has become. Many of the Company Owners frown upon his newfound wealth, for social movement like this is very unusual. He found that they wanted very little interaction with him due to his not being in his current class from the get go.
Due to this social ostracization, Joe decided to keep this river in the mountains as a family secret. This secret has created intergenerational social mobility for years, forever remembering the social climb of Fisherman Joe.