By Walt Hunter

PHILADELPHIA (CBS) — As temperatures rise, CBS 3 cameras found teenagers swimming in the same stretch of Pennypack Creek where two teenage boys died within weeks of each other last summer.

READ MORE: Pennsylvania US Senate Race Between Republicans Mehmet Oz, Dave McCormick Too Close To Call

The teenagers were swimming and splashing almost directly below a bridge that’s railing is covered with handwritten memorials to those who have drowned here.

Less than 100 yards away is where 15-year-old Nicky Simonetti was swept away to his death trying to save a 14-year-old friend who also perished.

“There’s always something missing, a piece of your heart is gone forever,” Nicky’s mother, Beth Simonetti-Gallelli, told CBS 3’s Walt Hunter.

READ MORE: John Fetterman Wins Democratic Pennsylvania Primary For Senate, AP Projects

“Nicky’s body was found 2 1/2 miles downstream, wrapped in a tree limb,” adds Beth.

Mrs. Simonetti-Gallelli now speaks at schools — along with other families, police and firefighters — trying to convince teenagers about the dangers of swimming in the Pennypack and other waterways.

The spot where CBS 3 found teenagers swimming is marked by “no swimming signs,” but a city worker told Hunter the signs are torn down almost as soon as they are put up.

With the hot weather, Mrs. Simonetti-Gallelli recalled the terrible moments 18 years ago, making this plea to teenagers to find another way to stay cool:

MORE NEWS: Phillies Return Home After Road Trip With 3-0 Loss To Padres

“Please, be safe, stay out of the creek,” she implored other kids. “Don’t leave your mother, your families, with a lifetime of sadness.”