Severe flooding caused by a powerful atmospheric river in December—dumping between 10 and 16 inches of rain across Western Washington—has become one of the region’s most significant weather events in recent memory. Ranked as the state’s fifth-wettest event on record, the storm led to levee breaches, road closures, school cancellations, and emergency evacuations.
One major disruption was the closure of the Stewart Road bridge in Sumner, where construction is underway on a new bridge spanning the White River. For local residents, including daily commuters, the closure added significant travel delays. However, city officials say the flooding also demonstrated the early success of a major infrastructure effort already in progress.
According to Sumner Communications Director Carmen Palmer, the partially completed White River Restoration Project played a crucial role in reducing potential damage. Floodwaters were successfully diverted into a newly created 200-acre habitat and wetland storage area—land that, without excavation, could have led to widespread flooding of homes, roads, and industrial zones.
The project addresses long-standing flooding issues along the White River, particularly in Sumner, where even moderate rainfall has historically caused problems. The river itself has a complex history. Before 1906, it flowed north toward Auburn and into Elliott Bay. But after catastrophic flooding that year, the river permanently changed course, merging with the Stuck River and flowing south toward the Puyallup River.
Over time, human intervention—including levees, concrete reinforcements, and channel modifications—stabilized the river’s new path but failed to eliminate flooding risks. A major flood event in 2009 pushed the city to pursue a long-term solution.
Launched with state funding in 2015, the multi-phase White River Restoration Project aims to balance flood control, environmental restoration, and economic protection. Plans include constructing flood barriers, elevating and replacing the Stewart Road bridge, restoring salmon habitats, and transforming former golf course land into floodwater storage wetlands.
The stakes extend beyond local concerns. Sumner’s industrial area plays a key role in regional supply chains, supporting major brands and distribution networks. Officials warn that unchecked flooding could have far-reaching economic consequences.
The project, estimated at $60 million, is expected to continue through at least 2027. Progress has been carefully timed to minimize environmental impact, particularly on salmon populations, which require specific conditions for migration and spawning.
Local leaders and tribal partners, including the Puyallup Tribe, emphasize the long-term environmental benefits. The collaborative effort aims not only to manage flooding but also to restore natural river functions and protect ecosystems for future generations.
As recent flooding has shown, proactive infrastructure and environmental planning may prove critical in mitigating the growing risks posed by extreme weather events.
