Algae Reclaims Lincoln Memorial Pool After $14.8M Makeover

Algae blooms are common in warm, nutrient-rich water. The reflecting pool is shallow and exposed to sunlight, creating ideal conditions for growth. The paint job did not address these underlying factors.

The National Park Service plans to apply algaecide regularly. Officials said the treatment is safe for visitors and wildlife.

The incident highlights the challenge of maintaining iconic landmarks on a budget. The reflecting pool is one of the most photographed sites in Washington, D.C., and its appearance draws frequent scrutiny.

Environmental groups have called for a more sustainable approach. They recommend using native plants to filter the water or installing a recirculation system to reduce stagnation.

The Trump administration has not commented on the algae return beyond the initial defense of the project. The White House press office did not respond to a request for comment.

The pool's makeover was part of a broader effort to refurbish the National Mall ahead of the 2026 U.S. semiquincentennial. Other projects include repairs to the Washington Monument and the World War II Memorial.

The algae's quick return suggests that cosmetic fixes may not be enough for long-term maintenance. The National Park Service faces a backlog of deferred maintenance across the park system, totaling more than $11 billion.

The reflecting pool's next scheduled cleaning is not yet set. Officials said they will evaluate the effectiveness of the algaecide treatment before deciding on further steps.