may 30, 2019 after drowning, park ranger warns of eno quarry dangers. by. may 30, 2019, 414 pm. state park official jay greenwood warns of the dangers of swimming and diving at the rock quarry in the eno,local teen drowns at eno river quarry news,jul 19, 2007 shambley said even if the quarry is closed for swimming, people are going to sneak in to use it. thats why he has asked the rangers to place buoys in the water to alert people about potentially dangerous spots. the quarry can be up to 60 feet deep in spots, and visibility is limited even in shallow waters.