Unlike interest groups with mysterious names like "Amercians for Families and Fuzzy Kittens", it's pretty obvious what an engineering society is advocating and why.
The facts are mostly in their favor. How many interstate overpass bridges are there? Most have 35 year lifespans, and most are older.
In my area (Albany, NY) the State is just wrapping up a 6 year project to retrofit a major bridge that was a sister of the I-35 bridge in Minnesota that catastrophically failed a few years ago -- before that event, it was known to be in rough shape and nothing was done.
Also in my city, a century old storm sewer just collapsed last week, swallowing an entire street, taking out a primary water main and gas main in the process.
This sort of infrastructure is decaying all over the place, and even when not failing catastrophically, it causes other issues. For example, current standards are to separate storm sewers from sanitary (i.e. Poop) sewers. Most older areas end up overflowing storm drains into both systems, overwhelming treatment plants and dumping untreated waste. Increased sprawl and pavement mean more storm water -- so local rivers and harbors are fouled all over the country.