MANASQUAN RESERVOIR ADVISORY:  A confirmed Harmful Algal Bloom is present with levels quantified at or above the NJ Health Advisory Guidance.  Do not drink or have contact with the water including, but not limited to, swimming, wading, and watersports.  Fish caught in this water body should not be eaten.  Pets and livestock should not contact or drink the water. 
https://www.monmouthcountyparks.com/page.aspx?ID=2531