The reflecting pool at the Lincoln Memorial turned green with an algae bloom on June 15 [1] shortly after a major renovation.
The incident has drawn scrutiny because the pool's restoration was intended to modernize the landmark and prevent such maintenance failures. The project included the addition of oxygen-bubble technology and a new bottom paint described as "American flag blue."
President Donald Trump initiated the renovation, which was overseen by the Department of the Interior. Reports on the total cost of the project vary, with some sources citing $14 million [1], $14.2 million [2], and others stating it reached $20 million [3]. The pool's discoloration occurred less than two weeks after the work was completed [1].
Officials said a recent heat wave triggered the algae bloom. However, some reports have attributed the recurring algae problems to prior mismanagement during the Obama administration [4].
A spokesperson for the Department of the Interior said the algae bloom turning the pool green was being “vacuumed up as we speak” [1].
The pool serves as a central focal point for the National Mall in Washington, D.C. The recent heat wave created conditions conducive to rapid algae growth, which obscured the newly applied blue paint on the pool floor [1, 2].
“The reflecting pool at the Lincoln Memorial turned green with an algae bloom on June 15.”
The rapid onset of an algae bloom immediately following a multi-million dollar renovation highlights the difficulty of maintaining open-water features in urban environments during extreme weather. While political arguments persist regarding long-term mismanagement, the immediate failure of the new oxygen-bubble technology to prevent the bloom suggests that environmental factors like heat waves may override current technical solutions for the pool's upkeep.
