Lincoln Memorial Reflecting Pool Cleanup Faces Algae, Paint Issues Despite $15M Investment
The Lincoln Memorial Reflecting Pool’s $15 million cleanup project, launched under President Donald Trump’s administration, has encountered new challenges, including recurring algal blooms and peeling “American flag blue” lining, according to recent reports.
What Led to the Cleanup Project?
The project, initially framed as a high-priority initiative by the Department of the Interior (DOI), aimed to address long-standing issues with algae and water quality at the historic site. President Trump highlighted the effort in April 2026, promising to complete the work within a week for $1 million. However, the scope expanded significantly, with the final cost exceeding $15 million.
The DOI justified the project as urgent, citing the need to prepare the site for the U.S. 250th anniversary celebrations. Contracts for resurfacing and filtration system upgrades were awarded without competitive bidding, with officials stating delays would “result in serious injury to the Government,” including safety and operational risks.
What Are the Current Issues?
Despite the DOI’s claim that “advanced nanobubbler technology” had “very effectively killed the algae,” the pool was found to be filled with green, algae-infused water during a June 2026 visit by ABC News. The agency reported that the “American flag blue” liner, installed to modernize the pool, was peeling and partially visible above the waterline.
A DOI spokesperson attributed the algae resurgence to “residual” growth from reactivated supply lines, stating that hydrogen peroxide and nanobubble ozone treatments were deployed. “The hydrogen peroxide would have ‘no harmful side effects to marine life or to the environment,'” the spokesperson added.
How Is the National Park Service Responding?
National Park Service (NPS) employees and contractors have been using vacuums to remove algae from the pool’s bottom. However, the peeling liner has raised concerns about the project’s long-term durability. ABC News contacted the DOI and the contractor for comment but received no immediate response.
The NPS has not publicly detailed the extent of the liner’s damage, but photos from June 2026 show sections of the blue coating detached and floating in the water. The agency has not yet addressed whether the issue stems from installation flaws or material degradation.
Why Does This Matter?
The Reflecting Pool’s cleanup has drawn scrutiny over cost overruns and the effectiveness of the technology used. The nanobubbler system, which releases ozone-infused bubbles to combat algae, has been praised by the DOI but contradicted by on-the-ground observations. Similar projects, such as the 2021 restoration of the National Mall’s Tidal Basin, faced delays and budget issues, highlighting recurring challenges in large-scale historic site maintenance.
Experts note that algae management in such environments often requires ongoing effort. “Even with advanced treatments, factors like water temperature and nutrient levels can trigger blooms,” said Dr. Emily Carter, a marine biologist at the University of Maryland. “The key is consistent monitoring and adaptive strategies.”
What’s Next for the Project?
The DOI has not announced a revised timeline for completing the work, but the NPS has stated it remains committed to restoring the pool ahead of the 250th anniversary. If the algae and liner issues persist, the agency may need to revisit its approach, potentially incorporating additional treatments or materials.
Public officials and preservation groups are likely to monitor the situation closely. The project’s outcome could set a precedent for future historic site renovations, particularly in balancing urgency, cost, and long-term sustainability.