Department Of Water Resources

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, checks the snowpack weight on a scale held by DWR's Wes McCandless, while doing the manual snow survey at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, inspects the snow survey tube before plunging it into the snow pack, as DWR's Wes McCandless, left, looks on during the snow survey at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, disassembles the snow survey tube after conducting the final snow survey for the season held at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, plunges the snow survey tube into the snow pack, during the snow survey at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, right, plunges the snow survey tube into the snow pack, as DWR's Wes McCandless looks on during the snow survey at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, accompanied by DWR's Wes McCandless, cross a snow covered meadow while conducting the manual snow survey at Phillips Station, Monday, May 1, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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FILE - In this Feb. 2, 2017 file photo, Frank Gehrke, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, crosses a snow covered meadow after conducting the second manual snow survey of the season at at Phillips Station near Echo Summit, Calif. Water managers will once again manually measure California's snowpack, saying the state is on track for one of the wettest winters on record after five years of drought. The California Department of Water Resources will do the survey Wednesday, March 1, 2017, in the Sierra Nevada. (AP Photo/Rich Pedroncelli, File)

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Frank Gehrke, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, crosses a snow covered meadow after conducting the second manual snow survey of the season at at Phillips Station Thursday, Feb. 2, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, checks the weight of the snow sample on a scale held by Mikel Shybut, a policy fellow with the California Council on Science and Technology, during the second manual snow survey of the season at Phillips Station Thursday, Feb. 2, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, carries the snowpack measuring tube as he crosses a snow covered meadow while conducting the second manual snow survey of the season at Phillips Station Thursday, Feb. 2, 2017, in Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, right, chief of the California Cooperative Snow Surveys Program for the Department of Water Resources, checks the weight of the snow sample on a scale held by Mikel Shybut, a policy fellow with the California Council on Science and Technology, during the second manual snow survey of the season at at Phillips Station Thursday, Feb. 2, 2017, near Echo Summit, Calif. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys for the Department of Water Resources, checks the ground for moisture while conducting the final snow survey of the season at Phillips near Echo Summit, Calif., Thursday, May 1, 2014. No snow was found at the Phillips station and the DWR reported that manual and electronic readings of the statewide snowpacks's water content showed it to be only 18 percent of average for this time of the year. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys for the Department of Water Resources, records his findings for the final snow survey of the season at Phillips near Echo Summit, Calif., Thursday, May 1, 2014. No snow was found at the Phillips station and the DWR reported that manual and electronic readings of the statewide snowpacks's water content showed it to be only 18 percent of average for this time of the year. (AP Photo/Rich Pedroncelli)

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The sun shines over a dried plant in the meadow where the Department of Water Resources, held the final snow survey of the season at Phillips near Echo Summit, Calif., Thursday, May 1, 2014. No snow was found at the Phillips station and the DWR reported that manual and electronic readings of the statewide snowpacks's water content showed it to be only 18 percent of average for this time of the year. (AP Photo/Rich Pedroncelli)

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Frank Gehrke, chief of the California Cooperative Snow Surveys for the Department of Water Resources, walk out to the meadow checks to conduct the final snow survey of the season at Phillips near Echo Summit, Calif., Thursday, May 1, 2014. No snow was found at the Phillips station and the DWR reported that manual and electronic readings of the statewide snowpacks's water content showed it to be only 18 percent of average for this time of the year. (AP Photo/Rich Pedroncelli)