On Tuesday, state water officials trudged into the Sierra Nevada for the first snowpack survey of 2017. Snowpack levels are crucial indicators of whether California will have enough water after the winter, as the melting snow flows into the state’s reservoirs. The reading at Phillips Station, near Lake Tahoe, however, is a largely ceremonial exercise, attracting attention in part for its visual interest. (See photos below.) After dipping poles into the snow, surveyors said the snowpack there was at roughly half the historical average.