In recent years, the regular admission rate for CS at Washington has been around 35 to 45%. Your prospects for admission would be better if you have academic stats at the higher end of enrolled CS and engineering students (e.g., ACT 28-33, per UW ASEE profile).
Here is information and advice for admitted freshmen from the UW CS Department:
https://www.cs.washington.edu/academics/ugrad/admissions/freshmen