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Lincoln Memorial Reflecting Pool turns green after surface painted

June 14, 2026Updated June 17, 2026, 1:09 p.m. ET
The Lincoln Memorial Reflecting Pool became overrun with algae days after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," a dark navy, ahead of Independence Day. The iconic landmark was built between 1920 and 1923. The National Park Service typically takes several measures to prevent algae growth and maintain water quality in the Reflecting Pool. Still, algae growth has continued to be a consistent problem through its history.
The Lincoln Memorial Reflecting Pool became overrun with algae days after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," a dark navy, ahead of Independence Day.

The iconic landmark was built between 1920 and 1923. The National Park Service typically takes several measures to prevent algae growth and maintain water quality in the Reflecting Pool. Still, algae growth has continued to be a consistent problem through its history.
Josh Morgan, USA TODAY
Water in the Lincoln Memorial Reflecting Pool (thin strip, center left from WWII Memorial) is hard to distinguish from surrounding grass as seen from a departing flight from Ronald Reagan National Airport as algae continues to bloom following the completion of recent renovations on June 16, 2026 in Washington, DC. The reflecting pool construction project was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
Water in the Lincoln Memorial Reflecting Pool (thin strip, center left from WWII Memorial) is hard to distinguish from surrounding grass as seen from a departing flight from Ronald Reagan National Airport as algae continues to bloom following the completion of recent renovations on June 16, 2026 in Washington, DC. The reflecting pool construction project was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
Win McNamee, Getty Images
National Park Service crews vacuum the bottom of the Lincoln Memorial Reflecting Pool a day after workers were seen pouring gallons of hydrogen peroxide into the water to kill algae that rapidly grew after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," Wednesday, June 17, 2026.
National Park Service crews vacuum the bottom of the Lincoln Memorial Reflecting Pool a day after workers were seen pouring gallons of hydrogen peroxide into the water to kill algae that rapidly grew after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," Wednesday, June 17, 2026.
Josh Morgan, USA TODAY
Workers treat green algae in the Lincoln Memorial Reflecting Pool in Washington, D.C., days after a multimillion-dollar renovation, as the Department of the Interior deploys nanobubbler technology and hydrogen peroxide to address the bloom.
Workers treat green algae in the Lincoln Memorial Reflecting Pool in Washington, D.C., days after a multimillion-dollar renovation, as the Department of the Interior deploys nanobubbler technology and hydrogen peroxide to address the bloom.
Josh Morgan, USA TODAY
Crews use nanobubbler treatment and vacuuming to clear algae from the Lincoln Memorial Reflecting Pool, which turned green shortly after a June renovation.
Crews use nanobubbler treatment and vacuuming to clear algae from the Lincoln Memorial Reflecting Pool, which turned green shortly after a June renovation.
Josh Morgan, USA TODAY
National Park Service crews vacuum the bottom of the Lincoln Memorial Reflecting Pool a day after workers were seen pouring gallons of hydrogen peroxide into the water to kill algae that rapidly grew after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," Wednesday, June 17, 2026.
National Park Service crews vacuum the bottom of the Lincoln Memorial Reflecting Pool a day after workers were seen pouring gallons of hydrogen peroxide into the water to kill algae that rapidly grew after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," Wednesday, June 17, 2026.
Josh Morgan, USA TODAY
Crews work to clear algae from the Lincoln Memorial Reflecting Pool days after a multimillion-dollar restoration, as warmer summer temperatures raise concerns about lingering growth.
Crews work to clear algae from the Lincoln Memorial Reflecting Pool days after a multimillion-dollar restoration, as warmer summer temperatures raise concerns about lingering growth.
Josh Morgan, USA TODAY
Algae blooms spread across the Lincoln Memorial Reflecting Pool days after renovations wrapped, with cleanup underway ahead of Independence Day.
Algae blooms spread across the Lincoln Memorial Reflecting Pool days after renovations wrapped, with cleanup underway ahead of Independence Day.
Josh Morgan, USA TODAY
A woman looks into the water of the Lincoln Memorial Reflecting Pool, which is experiencing algae growth just days after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," a dark navy, ahead of Independence Day.
A woman looks into the water of the Lincoln Memorial Reflecting Pool, which is experiencing algae growth just days after the landmark underwent a multimillion-dollar renovation that painted the pool's basin "American Flag Blue," a dark navy, ahead of Independence Day.
Josh Morgan, USA TODAY
A cleaning system sits along the edge of the Lincoln Memorial Reflecting Pool to combat algae growth just days after the landmark underwent a multimillion-dollar renovation.
A cleaning system sits along the edge of the Lincoln Memorial Reflecting Pool to combat algae growth just days after the landmark underwent a multimillion-dollar renovation.
Josh Morgan, USA TODAY
A tube from a cleaning system sits inside the Lincoln Memorial Reflecting Pool to combat algae growth.
A tube from a cleaning system sits inside the Lincoln Memorial Reflecting Pool to combat algae growth.
Josh Morgan, USA TODAY
Crews use nanobubbler treatment and vacuuming to clear algae from the Lincoln Memorial Reflecting Pool, which turned green shortly after a June renovation.
Crews use nanobubbler treatment and vacuuming to clear algae from the Lincoln Memorial Reflecting Pool, which turned green shortly after a June renovation.
Josh Morgan, USA TODAY
The Lincoln Memorial Reflecting Pool appears green with algae growth as workers continue cleanup efforts following the landmark’s recent renovation.
The Lincoln Memorial Reflecting Pool appears green with algae growth as workers continue cleanup efforts following the landmark’s recent renovation.
Josh Morgan, USA TODAY
Crews work to clear algae from the Lincoln Memorial Reflecting Pool days after a multimillion-dollar restoration, as warmer summer temperatures raise concerns about lingering growth.
Crews work to clear algae from the Lincoln Memorial Reflecting Pool days after a multimillion-dollar restoration, as warmer summer temperatures raise concerns about lingering growth.
Josh Morgan, USA TODAY
Workers address algae buildup in the Lincoln Memorial Reflecting Pool after its June reopening, as officials and experts weigh how long conditions may persist.
Workers address algae buildup in the Lincoln Memorial Reflecting Pool after its June reopening, as officials and experts weigh how long conditions may persist.
Josh Morgan, USA TODAY
Ducks swim around algae blooms in the Reflecting Pool days after the Trump administration’s multi-million dollar renovation project that repainted the pool's basin “American Flag Blue.”
Ducks swim around algae blooms in the Reflecting Pool days after the Trump administration’s multi-million dollar renovation project that repainted the pool's basin “American Flag Blue.”
Josh Morgan, USA TODAY
Algae blooms spread across the Lincoln Memorial Reflecting Pool days after renovations wrapped, with cleanup underway ahead of Independence Day.
Algae blooms spread across the Lincoln Memorial Reflecting Pool days after renovations wrapped, with cleanup underway ahead of Independence Day.
Josh Morgan, USA TODAY
Mounted U.S. Park Police ride along the recently renovated Lincoln Memorial Reflecting Pool on Monday, June 15, 2026.
Mounted U.S. Park Police ride along the recently renovated Lincoln Memorial Reflecting Pool on Monday, June 15, 2026.
Jack Gruber, USA TODAY
Algae is pictured in the Lincoln Memorial Reflecting Poo l following the completion of recent renovations on June 14, 2026 in Washington, DC. The reflecting pool construction project started in April and work was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
Algae is pictured in the Lincoln Memorial Reflecting Pool following the completion of recent renovations on June 14, 2026 in Washington, DC. The reflecting pool construction project started in April and work was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
Tasos Katopodis, Getty Images
People walk along the Lincoln Memorial Reflecting Pool where algae has begun to bloom following the completion of recent renovations on June 14, 2026 in Washington, DC. The reflecting pool construction project started in April and work was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
People walk along the Lincoln Memorial Reflecting Pool where algae has begun to bloom following the completion of recent renovations on June 14, 2026 in Washington, DC. The reflecting pool construction project started in April and work was completed last week as part of President Donald Trump's plan ahead of the nation's 250th anniversary.
Tasos Katopodis, Getty Images
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
KEN CEDENO, AFP Via Getty Images
A duck is pictured on June 14, 2026, swimming over algae at the bottom of the Lincoln Memorial Reflecting Pool, which has been painted blue at the directive of President Donald Trump, ahead of the 250th anniversary of U.S. Independence.
A duck is pictured on June 14, 2026, swimming over algae at the bottom of the Lincoln Memorial Reflecting Pool, which has been painted blue at the directive of President Donald Trump, ahead of the 250th anniversary of U.S. Independence.
Eric Lee, REUTERS
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
KEN CEDENO, AFP Via Getty Images
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
KEN CEDENO, AFP Via Getty Images
A worker clears algae from the Lincoln Memorial Reflecting Pool, which has been painted blue at the directive of U.S. President Donald Trump, ahead of the 250th anniversary of U.S. Independence, in Washington, DC on June 14, 2026.
A worker clears algae from the Lincoln Memorial Reflecting Pool, which has been painted blue at the directive of U.S. President Donald Trump, ahead of the 250th anniversary of U.S. Independence, in Washington, DC on June 14, 2026.
Eric Lee, REUTERS
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
KEN CEDENO, AFP Via Getty Images
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
PATRICK T. FALLON, AFP Via Getty Images
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
National Park Service workers push algae towards an aeration area in the center of the Lincoln Memorial Reflecting Pool following the completion of recent renovations in Washington, DC, on June 14, 2026. The reflecting pool project, undertaken as part of President Donald Trump's preparations for the nation's 250th anniversary, began in April and was completed last week.
KEN CEDENO, AFP Via Getty Images
Workers clear algae from the World War II Memorial side of the newly renovated Lincoln Memorial Reflecting Pool on Friday, June, 12, 2026.
Workers clear algae from the World War II Memorial side of the newly renovated Lincoln Memorial Reflecting Pool on Friday, June, 12, 2026.
Jack Gruber, USA TODAY
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