Lincoln Memorial Reflecting Pool Restoration Completed; Long-Term Durability Remains Uncertain

The Lincoln Memorial Reflecting Pool, a century-old landmark on the National Mall, was fully refilled by June 9, 2026, after a roughly six-week renovation project costing approximately $14.2 million in which workers sandblasted and coated the concrete basin with a dark-blue waterproofing material described by Trump as 'American Flag blue.' President Trump celebrated the completion on social media, claiming the pool 'never functioned properly' until now and crediting himself for the fix. However, within days of reopening, photographers and reporters from multiple outlets documented algae growth across the pool, including an expanding patch near the World War II Memorial; images from the scene showed green, murky water and workers using pool skimmers and a chlorine compound called Induclor to address the buildup. The Interior Department characterized the algae as 'residual' from supply lines dormant during construction and said newly installed nanobubblers — an ozone filtration system — would maintain the pool going forward. Trump's claims that the Biden and Obama administrations spent 'hundreds of millions of dollars' on failed fixes were disputed by a Roll Call fact-check, which found no major Biden-era work and put the Obama-era overhaul at approximately $34–35 million, not over $100 million as Trump stated; the pool's current water source also remains unclear, as federal agencies did not respond to inquiries. The renovation has also faced a lawsuit from the Cultural Landscape Foundation alleging the blue paint application violates federal law, and scrutiny over no-bid contracts and cost overruns relative to Trump's initial $2 million estimate.