Skiers at Great Divide

Snowpack readings across most basins in western Montana are above average for this time of year according to the Natural Resources Conservation Service.

Some parts of Montana received record-breaking snowfall in February, resulting in well-above-normal snowpack totals for March 1 for most river basins, according to snow survey data collected by the USDA Natural Resources Conservation Service. Twenty-five SNOTEL stations and manual measurement locations set new records for February totals, and 21 measurements at other locations were the second highest on record.

“Abundant mountain, valley and plains snowfall this winter has Montana under a blanket of snow at the beginning of March,” said Lucas Zukiewicz, NRCS water supply specialist for Montana. “While this is great news for long-term water supply, it’s been hard on a lot of families and businesses in the plains.”

Snowpack totals are above normal in all major river basins of the state of Montana for March 1, and some measurement locations are setting records for this date.

Snowpack update for March 2018

Most of these records are being set in the headwaters of the Upper Clark Fork, mountains of the Missouri around Helena and in the headwaters of the Upper Yellowstone and Clark’s Fork of the Yellowstone River basins. The Missouri currently sits at 136 percent of normal for snow to water equivalent.

While not record-setting, most other river basins have seen consistent and above normal moisture this winter due to La Nina weather patterns this winter. Many snowpack measurement locations have already reached the normal “peak,” or maximum amount of snow water contained in the snowpack, on March 1.

Only one area seems to be left out of this year, the Centennial range which serves as the headwaters for the Red Rock River in southwestern Montana. It has a snowpack that remains below normal for this date, Zukiewicz said.

“As we approach spring, water users across the state start to plan for the coming growing season, water supply and allocations from spring runoff of the mountain snowpack,” he said. “This year looks to deliver above average flows in the rivers in most locations due to the deep mountain snowpack.”

On March 1, the NRCS Montana Snow Survey began to issue forecasts for the spring and summer runoff with many locations expected to be above to well above average. Some expected volumes for rivers in south-central Montana for the April 1 through July 31 period are approaching records.

“The median forecast for the Clark’s Fork at Belfry, Montana, is above the record for that location,” Zukiewicz said. “There’s going to be a lot of water coming out of the Beartooth Range this spring and summer.”

Climatologically, the months of March through May are some of the most significant months with regards to precipitation for river basins east of the Continental Divide, and many basins already have an above-normal snowpack. Any continued snowfall will build on the above normal snowpack and will further increase the amount of water available for runoff.

“At this point, we have pretty close to assured adequate water supply in many areas due to heavy early season snowfall,” Zukiewicz said. “As much as it pains me to say it, a normal month or two would be the best case scenario from here on out.”

Some of that snow may get a chance to melt in the Helena Valley as warmer temperatures enter the region in coming days. After a chance of snow on Friday, the National Weather Service in Great Falls is calling for clear and sunny skies with highs in the 40s.

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