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Mystery and lore

Red Bluff underground tunnels

California · Downtown Red Bluff, near the Sacramento River (Tehama County)

Old-timers in Red Bluff tell of hidden passages beneath the downtown, including one said to run from the Masonic building toward the Sacramento River. The town has documented tunnel folklore tied to its historic riverfront Chinatown, of passages used for cover, storage, and moving goods out of sight. No public map confirms a layout; this is town lore, not a surveyed tunnel.

Where it is

Downtown Red Bluff, near the Sacramento River (Tehama County)
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The source

https://en.wikipedia.org/wiki/Red_Bluff,_California