Infrastructure in American cities can go back a ways. See this recent case in Chicago involving a gas pipe:
A small crowd gathered as a flatbed truck carefully backed into position next to a cavernous hole in the ground that revealed the retiree: a 17-foot-long piece of cast-iron pipe, believed to be the oldest natural gas pipe in the city of Chicago.
The pipe was in operation from 1859 until just last week, when the last customer relying on it officially switched over to a modernized polyethylene natural gas main, said Andy Hesselbach, Peoples Gas vice president of construction.
When the retiree began its work, the streets were paved with dirt and frequented by horse-drawn carriages. The Great Fire of Chicago wouldn’t occur for 12 years…
Replacements are prioritized based on risk, he said. In the last 30 years, the pipe excavated on Friday experienced 30 leaks, making it a prime candidate. Not every pipe that is retired is excavated, he said. Some are left in place while a new main is installed nearby.
Building good infrastructure to support all sorts of positive social and economic activity requires regular attention and maintenance. The cost to replace infrastructure can often seem prohibitive but upgrades are needed for systems that can be improved upon and/or consistently need repairs. Of course, it would be best to build for the long-haul at an efficient price from the beginning but this is not always possible as technology and places change.