The Head of the Charles Regatta is proceeding as planned this weekend despite a growing toxic algae bloom in the Charles River, health officials announced.

A cyanobacteria public health advisory along the Charles River has expanded to include all areas downstream of the Cambridge Street Bridge, according to an update released Thursday on Boston.gov .

However, officials said that the advisory has been lifted at both Magazine Beach and the BU DeWolfe Boathouse, where the regatta will take place.

Earlier this month, Boston health officials issued an emergency alert due to potentially harmful levels of cyanobacteria in the Charles River. The alert sparked concern over whether the bloom would impact the iconic race.

Officials expanded the advisory area after test results showed t

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