I read a book recently, Bold Forecast, that went into a lot of fascinating detail about Agnes.
https://www.amazon.com/gp/product/B0B2DK52R8/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i0
Barges lifting off of their moorings and being washed down city streets, every warehouse and office building along the Allegheny's north shore were filled to the first floor, a 20' high stack of barges at the bottom of the Highland Park dam... I never really paid attention to water damage, we lived north of Pittsburgh on a hill, but this book was eye-opening. 😬