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Snow Surveys in the Tuolumne Basin

November 3, 2015 Margaret Hannaford, Division Manager

Hetch Hetchy Water and Power

Operated by the San Francisco Public Utilities Commission

Services of the San Francisco Public Utilities Commission

Hetch Hetchy Water & Power 85 years!

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Survey Route Map

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Then

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& Now! 12

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Aerial Markers

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Snow Sensors – as early as 1980

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Continued support of manual surveys

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ASO

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Hannaford Snow Survey Heritage

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Data we use – from in & outside the basin

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• Watershed • Walker • Stanislaus • Merced • Mono Lake

• Cooperator Measurers • US Forest Service • National Park Service • PG&E • So. Cal Edison

Thank You Snow Survey Cooperators!

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