Travel Budget for Faculty Members in USA
Although I am a mathematician and not a CS or engineering professor, I would overwhelmingly expect that at a place like the University of Washington tenure track faculty members would be expected to secure external grant funding (for example from the NSF) and use this to cover their travel expenses.

Universities often provide startup funds which you can use for this purpose during the first couple of years -- but these don't get renewed when you run out.

In the long run, if you don't succeed in obtaining external funding, it is unlikely that your department would rush in to fill the gap. My department (less prestigious than Washington) provides a little bit of money to faculty members without grant support, but it is only enough to attend to one or maybe two conferences a year.