Recent and upcoming flooding in the Snoqualmie Valley

Published 2:50 pm Monday, March 9, 2026

Minor flooding is occurring in the Snoqualmie Valley the week of March 9, and more is expected the week of March 16, as winter weather comes into play.

There is a winter weather advisory from the National Weather Service for the foothills and valleys of Snohomish and Northern King counties as of 3 p.m. March 9. The advisory, in effect until 11 a.m. March 10, warns of 1-4 inches of snow overnight.

There is also consistent rain and possibly some snow forecasted for the entire Snoqualmie Valley this week.

The Snoqualmie River at the sum of the three forks hit flood levels the afternoon of March 8, reaching King County’s Flood Phase 2, but the water went down that evening.

Floodzilla recorded flooding the evening of March 8 in Fall City. The gauge at Neal Road SE showed water 0.6 feet higher than road level starting at 7:45 p.m. The water began to go down an hour later.

The gauge at NE 138th Street — a farm road outside Duvall — recorded flooding beginning the morning of March 9. As of 2 p.m., the water was 1.3 feet higher than road level.

As of 3 p.m. March 9, more flooding is predicted for March 17 in Carnation. Water levels are expected to crest at 53.61 feet at 5 p.m. that day. “Action” to prepare for flooding is taken when this gauge hits 50.7 feet.

The gauge below Snoqualmie Falls, near Fall City, is not expected to see flooding again in the next week.

Floodzilla’s flooding forecast data is provided by the National Weather Service Northwest River Forecast Center.

Floodzilla is a product of the Snoqualmie Valley Preservation Alliance. It is a free, online platform that imports water level data from 14 of the nonprofit’s own gauges in the lower Snoqualmie Valley, as well as data from U.S. Geological Survey gauges.

For additional flooding information, visit flood.kingcounty.gov.