The Lincoln Memorial Reflecting Pool in Washington turned bright green within days of being refilled after a renovation ordered by President Trump, whose administration sought an “American Flag Blue” appearance for the basin ahead of U.S. 250th anniversary events. Federal contracts for the work were valued at more than $14 million, and several accounts put the project’s cost at about $14.7 million. Crews used hydrogen peroxide treatments and algae-removal work after the bloom appeared. Scient...

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