But while most of the attention focused on transportation the first two years, the program this year will also emphasize entertainment, like the New York International Fringe Festival, and recreation, highlighted by the new pools.

“While they have been lovingly referred to as Dumpster pools, don’t let the name fool you,” said Janette Sadik-Khan, the city’s transportation commissioner. “These are clean, compliant mobile pools that will put even more ‘park’ into Park Avenue. It will almost be like a Park Avenue boardwalk.”

Each pool will be roughly 8 feet wide and 22 feet long, with a sloped bottom between 3 and 5 ½ feet deep  bigger than the typical Dumpster. There will no diving boards. No baby pool, either.

At no cost to the city, Macro-Sea, the Brooklyn company that designed the Dumpster pools, is converting the containers, which will be cleaned and have protective liners. As is the case with any other above-ground pool, a water filtration system will be installed, and the Department of Health will need to sign off on a permit, said David Belt, president of Macro-Sea.

Crunch, the fitness gym, will donate lifeguards, Ms. Sadik-Khan said.

At the end of each Saturday, the deck will drop to the sides and the pools will be covered by a heavy-duty mesh. The containers will then sit curbside, as if they were Dumpsters at a construction project  except that there will not be debris, but rather water, inside. The containers will be locked.