1915, July - Hell Gate swim
1916, August - Swims two miles down Hudson with brother on her back
1916, September - Becomes 1st woman to swim around Manhattan
The above three images and all other sepia photos appear courtesy of Ida Elionsky’s granddaughter, Joanna Langfield.
The following articles about the second and third women to swim around Manhattan mention that Ida Elionsky was number one:
1921 - Mille Gade becomes 2nd woman swim around Manhattan
1926 - Lottie Schoemmell becomes 3rd woman to swim around Manhattan