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: Dr. Oz Plans To Run For Senate Seat In Pennsylvania, Sources Say

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: Fourth Stimulus Check: Should You Expect Another Relief Payment?

“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: Teen Victim Speaks Out For First Time Following Racially Motivated Attack Aboard SEPTA Train

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