From my understanding and the maps I've seen, the Cerritos one has been on the east side of 15 at that point. I may be wrong, but that's what I recall seeing.
Looking at the log now, it appears that it's getting close to 215 and 74 now (meaning it would have burned through that triangle type area from the El Cerrito/Lake Elsinore stretch across to near Perris in the middle there with the 'v' part of the triangle pointing down torwards Temecula where 15/215 cross fruther south).
Not sure if I'm going to have this linked right (I hope...) but if you look at this map (that should be the Lake Elsinore area zoomed out right beyond the 'city' level you can see the triangle type area I was trying to describe above. From what I know of the area and what I've read or heard on the news (and from our great source here!) it's that light brown area to the east of 15 that's burned (don't know the whole extent, but that that was where it was generally).
http://maps.yahoo.com/maps_result?csz=Lake+Elsinore%2C+CA&state=CA&uzip=92530&ds=n&name=&desc=&ed=IGNf.Op_0TqZdZTginHBkAGnV33xHrt4VGXiOknLkS5e4DDTTMUekcPslx4p5cFicIPgJmS78cLIbQuim0w_txg.FrHW&zoomin=yes&BFKey=&resize=s&mag=6 For those who don't know the area, on that same page, the bottom right of the square near 79 (east of Temecula) is where the Eagle fire is.
Now after all that, hopefully the link went to the map in the right place.