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Mono County Museum Bridgeport CA Home Calendar Collections Contacts Directions Donations History Hours Fees Links Merchandise Newsletters Photos Walking Tour Welcome. This is the home page of the Mono County Museum located in Bridgeport California. The museum is owned and operated by the Mono County Historical Society MCHS which is a registered 501c3 nonprofit organization. The MCHS was founded and incorporated to preserve and promote the history of the Bridgeport Valley andnorthern Mono County California.