Three weeks ago the spill's extent could be pictured like this.
On May 21, the spill's extent superimposed on the San Francisco Bay looks like this. Oil has covered almost the entire bay, is lapping at the southern suburbs of Sacramento, and pushing into the Sierra foothills. This thing is enormous!
Here's the Gulf view.
You can look at the spill's extent superimposed over your area at Paul Rademacher's clever widget.