It will be ideal beach day weather in Massachusetts this weekend, with sunny skies and temperatures in the 80s and 90s. But dozens of beaches across the state are closed for swimming because there is either too much bacteria in the water or toxic algae is present.

The Massachusetts Department of Public Health maintains a daily online dashboard of beach closures. As of 8 a.m. Friday, there were more than 50 closures listed.

The main beach at Walden Pond in Concord is closed all summer due to construction of a new bathhouse.

Beach closures in Massachusetts

Damon Pond Beach, Ashby (Bacterial Exceedance)

Ashland Reservoir - Main Beach, Ashland (Bacterial Exceedance)

Woodbury, Beverly (Bacterial Exceedance)

Nutting Lake - Micozzi Beach @ North, Billerica (Bacterial Exceedance)

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