The Washington National Guard has been mobilised in response to historic flooding across western parts of the state, as relentless rainstorms pushed rivers beyond their banks, inundated communities and forced widespread evacuations.

Guard units were deployed at the request of state authorities to support local emergency services as floodwaters cut off roads, damaged homes and threatened critical infrastructure.

Officials said Guard personnel were tasked with high-water rescues, transportation of stranded residents, distribution of emergency supplies and reinforcement of flood control measures.

Heavy rainfall over several days caused rivers including the Chehalis, Cowlitz and Skagit to rise rapidly, flooding low-lying neighbourhoods and agricultural areas.

Emergency managers warned that saturated ground and continued runoff could prolong dangerous conditions even as rainfall eased in some locations.

The flooding prompted the closure of major highways and local roads, isolating some towns and complicating access for first responders.

Shelters were opened for displaced residents, while power outages and damage to utilities added to the strain on affected communities.

State officials described the flooding as among the most severe seen in decades, with impacts stretching across multiple counties.

The National Guard’s involvement underscored the scale of the emergency, with commanders emphasising close coordination with state and local agencies to protect lives and property.

Authorities urged residents to heed evacuation orders, avoid flooded roadways and remain alert as recovery efforts continue.

Damage assessments are ongoing, with officials warning that rebuilding and cleanup will take time following one of western Washington’s most significant flooding events on record.