Here’s why the Lincoln Memorial Reflecting Pool went green so fast
The Lincoln Memorial Reflecting Pool has turned a vibrant green due to an algal bloom caused by high nutrient levels and extreme heat. Experts suggest that the pool's new blue coating may be absorbing more heat, further accelerating algae growth in the stagnant water.
Why it matters
The incident serves as a visible example of environmental and maintenance challenges facing public infrastructure in urban areas.
A U.S. National Park Service employee uses a vacuum pump to clean algae off the bottom of the newly recoated Lincoln Memorial Reflecting Pool on the National Mall on Tuesday. (Chip Somodevilla / Getty Images) By Mack Baysinger Follow June 19, 2026 5:53 PM PT 26 3 min Click here to listen to this article Share via Close extra sharing options Email Facebook X LinkedIn Threads Reddit WhatsApp Copy Link URL Copied! Print 0:00 0:00 1x This is read by an automated voice. Please report any issues or inconsistencies here .
The article provides a scientific and logistical explanation for a local event without political bias.
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