Timerover51
SOC-14 5K
Plenty for a population of thousands.
As a disaster point it doesn't effect the rest of the planet. However, thousands of small asteroid hits one in the storage facility, another in Lake Michigan, etc. would leave a massive disaster scenario. Chicago had the river and channel system which made it a trade hub larger than St Louis. In "The Last Ship", St Louis becomes the seat of a new government.
You do understand that the natural gas storage sites are all underground, either in former natural gas fields or partially dissolved salt domes, there is very limited above ground storage.
What made Chicago a major trade hub was its location on Lake Michigan and the railroads having to go around the Great Lakes. The location on Lake Michigan allowed it to send cargo cheaply by ship through the Great Lakes to Buffalo and the connection to the Erie Canal.