Are Mashpee Ponds Posted for Either a Cyanobacteria Advisory or a Bacteria Closure ?
Check for signs on the water that look like this :
Check on The Association To Preserve Cape Cod's Website - Cyanobateria Map : https://apcc.org/our-work/science/community-science/cyanobacteria/
Check the Department of Natural Resources Page: All advisories will appear as a red alert at the top of the DNR Town Website.
And finally check The Barnstable County Department of Health's Bathing Beach Sampling Progam Website for bacteria closures : https://www.capecod.gov/departments/health-environment/programs-services/water-and-wastewater/beach-sample-results/