Sierra Snowpack Lags, But NID Reservoir Storage Remains Strong

Despite below-average snowpack, Nevada Irrigation District's reservoirs are at 94% of capacity heading into irrigation season.

Published on Mar. 5, 2026

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Nevada Irrigation District's March snow survey shows the Sierra snowpack is at 65% of the historical average, with an average snow water content of 18.4 inches compared to the usual 28.1 inches. However, the district's total reservoir storage remains strong at 94% of capacity and 119% of average for this time of year.

Why it matters

The Sierra Nevada snowpack is a critical source of water supply for California, and its levels directly impact water availability for irrigation, drinking water, and other uses throughout the year. While NID's reservoir storage remains robust, the below-average snowpack could signal potential water supply challenges if dry conditions persist.

The details

NID hydrographers measured the snowpack at 65% of the historical average, with an average snow water content of 18.4 inches across the district's five snow courses. This is well below the historical average of 28.1 inches. However, the district's total reservoir storage as of February 28th was 252,551 acre-feet, which is 94% of capacity and 119% of average for that date.

  • The March snow survey measurements were taken on February 26th and 23rd.
  • February precipitation totaled 15.15 inches, exceeding the historical monthly average of 10.67 inches.

The players

Nevada Irrigation District (NID)

A California water district that provides raw and treated water to customers in Nevada and Placer counties.

Thor Larsen

NID Water Resources Superintendent.

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What they’re saying

“The second half of February provided some much-needed precipitation and snow to our high-elevation watershed. Despite above-average precipitation in February and increases to the snowpack, conditions remain below average for this time of year.”

— Thor Larsen, NID Water Resources Superintendent

The takeaway

While NID's reservoir storage remains strong, the below-average Sierra snowpack is a concern for water managers as they prepare for the upcoming irrigation season. The district will need to closely monitor snowpack levels and precipitation in the coming months to ensure adequate water supplies.