If you’re specifically asking about grad programs and WashU, I don’t think they’re particularly well known for their CS department. Yes, USWNR ranks them highly, but I think the Shanghai ranking is actually more scientific / logical, and there they’re not listed:
http://www.shanghairanking.com/World-University-Rankings/Washington-University-in-St-Louis.html
Undergraduate programs are much harder to figure out, and I’m personally trying to understand WashU vs Rose vs RPI. So far, my impression of WashU’s undergrad CS isn’t that great (from what I’ve learned, and from sitting in on 3 classes). You can see my CS-based thread here:
http://talk.collegeconfidential.com/math-computer-science-majors/1972532-rose-hulman-vs-rpi-vs-washu-for-cs.html
For my daughter, I think Rose is probably the best learning environment. But I’m trying to make sure that she’ll have a good time socially as well…