WASHINGTON, April 23—Confidence among U.S. construction industry leaders plummeted in February due to expectations of the economic fallout associated with COVID-19, according to the Associated Builders and Contractors Construction Confidence Index released today. Readings for sales, profit margins and staffing levels expectations fell below the threshold of 50 for the first time in the history of the series, signaling expected contraction along all three dimensions. This survey was conducted March 20-31.