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The fog signal building and lighthouse were completed in 1909 and commissioned one year later.
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For 59 years, the keepers at Split Rock warned ships away from the rock and treacherous North Shore with its 370,000-candlepower beacon.
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The massive installation required the services of 3 full time keepers operating 24 hours a day, 7 days a week.
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In the early days, the installation was isolated with the lake providing the only access.
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Now an historic relic, the photogenic site has become a Minnesota icon.