By Steven Schauer, Deputy Executive Director
On February 10, the Board of Supervisors of the King County Flood Control District received a comprehensive briefing on the December 2025 flood event, an event widely described as one of the most significant in county history.
This week’s blog is a summary of the briefing, which was presented to the board by:
- Michelle Clark, Executive Director, King County Flood Control District
- John Taylor, Director, King County Department of Natural Resources and Parks
- Josh Baldi, Director, King County Water and Land Resources Division
- Krystle Walker, Seattle District Chief of Emergency Management, U.S. Army Corps of Engineers
The takeaway was clear: while the damage was extensive, the coordinated response across jurisdictions prevented what could have been a far more devastating outcome. Most importantly, no lives were lost in King County.
A Historic Flood Event
Multiple atmospheric rivers struck in succession, simultaneously driving five of the six major river systems in King County into Flood Phase 4 flooding, which is the highest classification.
The event was not only extreme in magnitude, but also in duration. High water levels persisted for weeks, placing extraordinary stress on levees, revetments, dams, and flood facilities throughout the county. The experienced flood managers providing the briefing noted they had never seen a countywide event of this scale in their careers.
A Countywide Response
King County Flood Control District Executive Director Michelle Clark emphasized that the outcome, particularly the absence of fatalities, was the result of nearly two decades of collaboration between the King County Flood Control District and its partners.
The representatives from the King County Department of Natural Resources and Parks and the U.S. Army Corps of Engineers detailed an unprecedented mobilization:
- An over three-week activation of the Flood Warning Center with 44 county staff working at least one shift
- Around the clock flood patrols monitored nearly 2,000 miles of riverbank with 88 county staff and more than 50 National Guard members working at least one shift
- Swift-water rescue operations
- Emergency repairs conducted to 16 damaged facilities
- 90 U.S. Army Corps of Engineers staff responded across three states
- Distribution of hundreds of thousands of sandbags and flood-fight materials
Engineers, public works crews, wastewater operators, emergency managers, sheriff deputies, and volunteers worked around the clock, often in the middle of the night and in dangerous conditions.
One of the most striking examples occurred in the City of Pacific, where a breach in a HESCO barrier developed rapidly in the early morning hours. King County flood patrol staff, who were on site when the breach occurred, recognized the escalating threat, alerted residents, and coordinated with law enforcement and the U.S. Army Corps of Engineers within minutes. Their quick action prevented potentially catastrophic loss of life.
Similarly, when a breach occurred near Tukwila on the Desimone Levee, King County staff were on site when the breach started. The quick response from county staff, together with important assistance provided by the City of Kent and the U.S. Army Corps of Engineers, minimized the damage, which could have been disastrous. It was noted that the situation “could have unzipped” the levee into a far larger failure if not for the rapid response and fortunate stabilization of the structure.
The Scale of Impact
While no lives were lost, the damage was widespread:
- 25% of the county’s 509 river flood risk reduction facilities sustained damage
- Emergency repairs were conducted across multiple river systems
- 398 homes and 62 businesses submitted reports of flood damage
- Equipment and property losses were significant
- Recovery and permanent repairs will take years
Post-flood inspections began immediately, and repair prioritization is underway. The King County Flood Control District will continue working with its service providers to address the most critical repairs first, while seeking potential state and federal disaster assistance.
Investments That Made a Difference
Board members also heard how prior investments in flood risk reduction paid dividends during this event. Since its inception in 2007, the King County Flood Control District has invested over $623 million in flood risk reduction, completing 123 projects.
Levee setbacks, property buyouts, elevated homes, and expanded floodplain capacity reduced water levels and pressure on key facilities. In some project areas, homes that once flooded repeatedly no longer exist in the floodplain because of earlier buyout programs.
These “non-stories” represent some of the King County Flood Control District’s greatest successes.
Extraordinary Federal Partnership
The U.S. Army Corps of Engineers described the flood as “record-breaking” in both scale and duration. Their Emergency Operations Center remained opened and activated for 69 days at the time of the briefing.
The U.S. Army Corps of Engineers:
- Provided direct assistance for levee emergencies
- Supplied over 265,000 sandbags, 3,770 super sacks, and 12,700 linear feet of flood barriers
- Deployed two automated sandbag machines and nine pumps
- Sent engineers to sites within minutes of breach notifications
- Coordinated closely inside the King County Emergency Operations Center
The speed of coordination, especially during the Desimone and Pacific breaches, demonstrated years of flood planning and trust between agencies.
Gratitude for Public Service
The panelists and Board members reflected on the significant efforts of public servants. In an era when public service is often criticized, this flood event was a powerful reminder of its value.
County, city, and federal employees stood in cold rain throughout the night. Engineers made split-second decisions. Public works crews rushed heavy equipment through traffic by police escorts. Public service staff who were not on the “front line” of the flood fight volunteered to delivered food to field staff.
The outcome, no fatalities in a historic flood, was not accidental. It was the result of preparation, professionalism, and commitment to public service.
Lessons Learned
Even with strong preparation and impressive emergency response, the briefing highlighted important lessons learned from the historic December 2025 flood.
1. Duration Matters
While forecasting accurately predicted major flooding, the extended length of high water stressed flood risk reduction systems in ways not fully anticipated.
2. Deeper Bench Needed
Sustained operations burned out staff. Expanding cross-training for flood patrol, heavy equipment operation, and emergency roles will be critical for future events.
3. Equipment Inventory
The event revealed the need for greater heavy equipment availability and rapid deployment capacity.
4. Communication Coordination
Supervisors discussed the importance of aligned emergency messaging across jurisdictions during fast-moving situations.
5. Climate Realities
Staff acknowledged that climate change projections suggest more intense and prolonged storm events in the future, underscoring the urgency of continued resilience investments.
Moving Forward
This briefing marked the beginning of ongoing review. The December 2025 flood will inform:
- Future capital improvement priorities
- Grant allocations
- Emergency response training expansion
- Equipment procurement strategies
- Climate resilience planning
The King County Flood Control District remains committed to learning from this event, strengthening partnerships, and continuing investments that protect people, property, and the natural systems that help shape King County.
As Board members emphasized, preparation may not always be visible in dry years, but when the rivers rise, it makes all the difference.