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Green algae return to reflecting pool days into Trump’s renovation

Crews are using hydrogen peroxide and nanobubbler technology to clear the bloom after a $14.2 million renovation meant to keep the pool blue.

  • Just days after a $14.2 million renovation, the Lincoln Memorial Reflecting Pool became overrun with algae, threatening preparations for the nation's 250th anniversary celebration on July 4.
  • President Donald Trump commissioned the project to seal leaks and paint the basin "American Flag Blue," previously disparaging the pool as "filthy" and "dirty" for years.
  • On Sunday, National Park Service workers in waders manually cleared algae with hand tools, while the Department of the Interior attributed the growth to "residual" material from supply lines dormant during eight weeks of construction.
  • Hans Paerl, Research Professor of Marine and Environmental Sciences at the University of North Carolina at Chapel Hill, told USA TODAY on Monday the pool may remain impacted by algae as temperatures rise.
  • Algae thrives in hot weather but dissipates in cooler months, experts explained, meaning July temperatures in the upper 80s and 90s may complicate efforts to restore the pool's blue appearance before Independence Day.
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Lean Left

Donald Trump bombarded for months with messages on his social network to brag about the reform of the reflective pool that extends to the feet of Lincoln Memorial, one of Washington D.C.’s iconic landmarks, the scene of Martin Luther King’s historic speech in 1963 and popular print in a multitude of films. The U.S. president boasted that he would fix the pond to look spectacular for next July 4th, when the 250th anniversary of U.S. independence …

·Spain
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Right

In early June, US President Donald Trump proudly presented the renovation project of the iconic mirror pool in front of the Lincoln Memorial in Washington D.C. The traditional gray concrete was replaced with a blue surface, the color of the American flag. However, it now appears that the pool is not turning blue, but green due to heavy algae growth. According to experts, the water temperature is rising faster because of the new color. This expla…

·Amsterdam, Netherlands (Kingdom of the)
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Lean Right

$14 million for free: Washington's famous water basin should shine blue again on Independence Day. Work just finished, the pool is green again, despite blue tiles.

·Dortmund, Germany
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CNN broke the news in Atlanta, United States on Sunday, June 14, 2026.
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