An atmospheric river brought very heavy snow to north-central Idaho that triggered multiple impacts including treefall, avalanche, road closures, and hazardous travel.

Heavy Snow in NORTHERN CLEARWATER MOUNTAINS, IDAHO
From 05-JAN-22 20:46:00 to 08-JAN-22 06:11:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snowfall totals amounted to around 2 feet in the area which resulted in poor driving conditions and a few power outages. Pierce received a 3 day snowfall total of 20.6 inches through the 7th, which was the 7th highest snowfall during any time of the year since 1963.

Heavy Snow in SOUTHERN CLEARWATER MOUNTAINS, IDAHO
From 05-JAN-22 18:00:00 to 06-JAN-22 06:11:00 (PST-8)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

More than 2 feet of heavy snow fell across the region with the Idaho Department of Transportation stating that the snow rates were up to 3 inches per hour at times. US-12 between Kooskia and Powell was closed from 2 pm PST Jan. 6 through 4 pm Jan. 9 due to avalanche and treefall danger. It was estimated that 150 trees fell due to the weight of the snow along the highway. Also a large avalanche occurred at milepost 136. Power outages were reported east of Kooskia and also in the Elk City area.

Avalanche in SOUTHERN CLEARWATER MOUNTAINS, IDAHO
From 07-JAN-22 08:00:00 to 07-JAN-22 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A large avalanche, more than 10 feet deep and up to 40 feet wide was triggered by heavy snow near milepost 136 on US-12. This along with treefall caused the highway to be closed for 3 days. The last time an avalanche crossed US-12 was in 2008. The date and time of the avalanche is a coarse estimate.

Heavy Snow in OROFINO / GRANGEVILLE REGION, IDAHO
From 05-JAN-22 21:00:00 to 06-JAN-22 15:00:00 (PST-8)
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow amounts during this event included 10 inches on the Camas Prairie, 12.5 inches in Orofino, 14.8 inches located west-northwest of Orofino, and 18.5 inches in Woodland. Multiple trees fell onto US-12 between Orofino and Kamiah which halted plowing operations and damaged power lines. Besides a plethora of power outages, there were area-wide school closures and delays.

Heavy Snow in LOWER HELLS CANYON / SALMON RIVER REGION, IDAHO
From 05-JAN-22 14:00:00 to 06-JAN-22 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS spotter located 3 miles southwest of Riggins reported 10.4 inches of snow in 3 days ending on the 7th. When compared to the longer Riggins climate record, this is within the top 10 highest snowfall for that area. The Riggins school closed due to heavy snow.

Heavy Snow in EASTERN LEMHI COUNTY, IDAHO
From 04-JAN-22 21:00:00 to 06-JAN-22 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snow fell, ranging from 16 inches in Salmon to 22 inches in Gibbonsville over a 3 day period, and caused difficult travel in Lemhi County.

Heavy Snow in WESTERN LEMHI COUNTY, IDAHO
From 05-JAN-22 03:00:00 to 06-JAN-22 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Williams Creek Summit received between 18 and 24 inches of snowfall.