The Lincoln Memorial Reflecting Pool in Washington, D.C., has made headlines this week by turning green with algae following a renovation ordered by President Donald Trump. This transformation occurred right after the multi-million-dollar refurbishment, which Trump had promised would result in an ‘American Flag Blue’ hue.
The pool, which spans from the Lincoln Memorial to the World War II Memorial near the White House, has served as an iconic backdrop for numerous historical events and daily life in the capital for decades. Over time, its water color has frequently changed due to various conditions.
What Happened to the Lincoln Memorial Reflecting Pool?
Recent images from the pool show algae quickly spreading over the surface mere days after it was refilled. This raises questions about the redesign’s impact on conditions that might facilitate rapid algae blooms. Algae issues have persisted since the pool’s opening over a century ago, and Trump has focused on resolving these problems recently.
Hydrogen Peroxide Used to Combat Algae
To address the algae issue, National Park Service teams poured chemicals and ozone nanobubbles into the pool on Tuesday. This action aims to control the algae growth—a strategy similar to those used prior to Trump’s renovations. Hydrogen peroxide is commonly chosen for water treatment due to its ability to oxidize and break down algae and other organic contaminants.
Historical Moments at the Reflecting Pool
1963: March on Washington
The pool served as a venue during the March on Washington for Jobs and Freedom, a pivotal event advocating civil and economic rights for Black Americans. Reverend Martin Luther King Jr’s iconic ‘I Have a Dream’ speech further cemented the pool’s historical significance.
1968: Poor People’s Campaign
Five years later, King directed efforts toward economic and human rights for impoverished Americans. The campaign led to encampments and rallies associated with the pool, known as the Poor People’s Campaign.
1989: Mobilize for Women’s Lives Rally
A nationwide abortion-rights demonstration in November 1989 included protests around the pool, drawing about 350,000 participants.
1993: Call for Reunion
Thousands gathered for a star-studded inauguration celebration for President Bill Clinton, with performances by musical legends such as Michael Jackson and Aretha Franklin.
1999: Welcoming the New Millennium
Fireworks marked New Year’s Day 2000, launched from the Reflecting Pool and Washington Monument.
2007: Sunsets and Storms
April 16, 2007, saw high winds turning the pool gray, while later in November, it reflected bright skies.
2009: President Barack Obama’s Inauguration Celebration
The pool hosted hundreds of thousands during another inauguration, showcasing musical performances and historical readings with President-elect Barack Obama present.
2010: Turning Green
Images from August 2010 reveal the pool’s green tone under cloudy skies.
2012: A Refurbishment and Algae
Obama’s presidency saw the pool refurbished for $30 million. Yet, algae reappeared shortly after.
2013: 50 Years Since MLK Speech
The event marked a commemorative march and rally, led by Al Sharpton and Martin Luther King III.
2015: Reflecting Blue Skies
Three years post-refurbishment, the pool reflected blue skies and the Lincoln Memorial.
2020: Protesters and Voters
Sharpton and the National Action Network arranged a march advocating criminal justice reforms, set on the March on Washington’s anniversary.
2021: 20 Years Since 9/11
The pool appeared gray-green on September 11, 2021, marking two decades since the terror attacks.
The Pool’s Capacity
The reflecting pool holds approximately 6.5 million gallons. Depth varies from 18 inches at its edges to 30 inches at the center. During Obama’s 2012 refurbishment, a new circulation and filtration system was installed using water from the Tidal Basin. Trump has criticized this update, advocating for a higher standard.
Details on Trump’s Renovations
Trump’s renovation aimed to revamp the National Mall for America’s 250th anniversary. The pool’s century-old surface received a dark blue coating to enhance its appearance and prevent leaks. Draining and repairs of the basin and infrastructure began earlier this year, followed by resurfacing with the desired blue finish. The pool was refilled shortly after, but rapid changes in water quality during the brief stabilization window may have augmented algae growth.
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