Kelli,
Alison is correct, we do not have much here in the way of pop lyrics. The site I am most familiar with is the On-Line Guitar Archive, OLGA.net.
Their main site is closed, but you can do a search from the home page. If you get a positive hit, you can click on one of the mirror sites (California, Poland, etc.) and usually find the lyrics or tab. I did that for you and found Under the Bridge. It has the lyrics written in among the guitar tab, but as someone familiar with the song, you should be able to extract them.
Enjoy the music!
Roger in Baltimore