Multiple intel sources: The Baltimore bridge collapse was an absolutely brilliant strategic attack on US critical infrastructure most likely cyber & our intel agencies know it. In information warfare terms, they just divided the US along the Mason-Dixon line, exactly like the Civil War.
The second busiest strategic roadway in the nation for hazardous material is now down for 4-5 years which is how long they say it will take to recover. Bridge was built specifically to move hazardous material fuel, diesel, propane gas, nitrogen, highly flammable materials, chemicals, and oversized cargo that cannot fit in the tunnels that supply chain now crippled.
Make no mistake: this was an extraordinary attack in terms of planning, timing & execution.
The two critical components on that bridge are the two load-bearing pylons on each end, closest to the shore. They are bigger, thicker and deeper than anything else. These are the anchor points and they knew that hitting either one one of them would be a fatal wound to the integrity of the bridge.