[Johnny555]

How did you calculate that? I don't know how much snow there was, but 10 inches of snow has around 1 inch (2.5cm) of water.

The bridge was 136m long, by about 13m wide and assuming 2.5cm of water content:

136m * 13m * .025m = 44 m^3 of water, or 44,000 kg, roughly 50 US tons.

A newspaper report said there was a light snow with 1 or 2 inches accumulated since 2am the morning of the collapse. Photos of the scene showed grass and small rocks on the ground visible through the snow, so it doesn't seem like there was a lot of snow on the ground. Even if there was heavy snow a couple days before the collapse, most of it would have been plowed off, I don't see big berms of snow on pictures of the collapse.

So if there was just a couple inches of snow, then it was probably closer to 10 tons worth of snow.

https://www.cnn.com/2022/01/28/us/pittsburgh-bridge-collapse...

[intrasight]

We had almost 8 inches of heavy snow. But Still my math must have been off (did in my head). Doing again I get

10 lb/ft * 450ft * 45ft / 2000 = ~100 tons