ORANGE COUNTY ALMANAC : High Tide Was Bad News
Newport Beach’s Balboa Island regularly vanished from sight during high tides in the early 1900s. Formed by silt deposited as the Santa Ana River flowed into Newport Bay, it was just a high spot in the mud.
In the 1920s, the river was diverted into the ocean, and channels were dredged around the island, leaving it high and dry.
Source: “Mission County” by Warren F. Morgan
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