The Lincoln Memorial’s Reflecting Pool will be drained and cleaned next week after a waterborne parasite killed dozens of ducklings.

The National Park Service (NPS) said Friday that it has observed the deaths of about 80 ducklings in the Reflecting Pool, which it says were likely caused by parasites that grow on snails that live in the water.

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Chemical treatments can’t kill the parasites and snails, so the Reflecting Pool must be drained and cleaned, according to an NPS statement obtained by The Washington Post.

The NPS said it will begin draining the pool Sunday, with cleaning taking place the following week. Refilling the pool will begin June 16.

The pool draining follows a May project by the Architect of the Capitol, in conjunction with nonprofit City Wildlife, to build a “duck ramp” to help ducklings go in and out of the Capitol's reflecting pool.

The Capitol reflecting pool is located on the opposite end of the National Mall from the Lincoln Memorial Reflecting Pool.