Flash Flood — Sacramento, California

2023-01-01 · near Slough House, Sacramento, California

Event narrative

There was a male fatality due to drowning in a submerged car, confirmed by Cosumnes Fire Department near SR 99 and Dillard Rd. A levee breech on the Cosumnes River caused the flash flood. This was one of three drowning deaths reported from the flash flood event. The Cosumnes Fire Department said they rescued dozens of people in the area over the past 24 hours. A helicopter from Metro Fire also rescued several people in the area. SR 99 remained closed due to flooding on the roadway. Several vehicles are still stuck in the flood waters. Wilton firefighters responded to 25 vehicles stranded in flood water and half a dozen fallen power lines. They also cleared many downed trees from the roadways as they navigated around Wilton.

Wider weather episode

A strong atmospheric storm brought moderate to heavy rain and a period of strong winds New Years Eve into early New Years Day, along with heavy high-elevation Sierra snow. There were 3 fatalities reported due to drowning. Precipitation totals by 8 am (over 24 hours) were around 1 to 3 inches for the southern Sacramento and northern San Joaquin Valleys, 3 to 8 inches for the Motherlode foothills and Northern Sierra from around SR 70 southward, with widespread flooding in those areas. Rainfall further north was generally an inch or less. There was significant river flooding on the Cosumnes River in Sacramento County around Wilton, due to multiple levee breaks. The river reached flood stage on the morning of December 31, and stayed in flood stage past midnight and into January 1. The flooding resulted in the evacuation of Wilton as the river went out-of-bank, with area highways and roads being closed, including SR-99. Significant flooding occurred from Wilton downstream through Interstate 5. River flooding was also reported along the Mokelumne River near Benson's Ferry and Mormon Slough at Bellota. Flooding of streams, in low areas and from clogged storm drains also closed many other roads across Northern California, with several small communities being evacuated. These events occurred mainly on December 31st and were reported on that date. Heavy snow disrupted mountain travel, with a total of 20 to 40 inches of snow above 6000 feet by the morning of the 1st. There were multiple spinouts causing Interstate 80 to be shut down for 18 hours. Highway 50 was closed in El Dorado County due to a combination of flooding and snow. High winds gusting to 50-65 mph in the Central Valley caused large numbers of trees to fall, bringing widespread power failures across the area, with hundreds of thousands of customers impacted. Most of the strong winds occurred on New Years Eve, with the damage events being reported on December 31, 2022, but power outage issues continued for tens of thousands of customers into the new year. Many local roads were also closed to downed trees blocking them, as well as many trees were reported to have fallen on homes and automobiles.

View location on OpenStreetMap → (38.4913, -121.2040)

Source: NOAA Storm Events Database, event_id 1075542. Narrative written by the NWS forecast office that issued the report.