Chicago fire department hoses down bridges as sweltering temperatures expand metal and block river access on day four of suffocating heat dome

The Chicago Fire Department was forced to hose down bridges after the record-breaking heat caused them to expand and block river access to boats as more than 60 million people across the Northeast brace for day four of the suffocating heat wave. Video shows the moment a boat from the fire department propelled water onto the steel beams of the Michigan Avenue bridge on Saturday. Chicago has several 'movable bridges' made of steel that raise up and let boats pass through. But in extreme heat cases, the steel expands and causes the bridge to become inoperable and unable to raise up or close. The sweltering heat is expected to continue baking the majority of the US for the rest of the week as temperatures are predicted to drop after the Fourth of July. Meteorologists described the rising three digit temperatures experienced in many parts of the country as 'relentless' and 'dangerous'