I thought some of you might find this interesting. About half-way back in Sandstone Canyon (Anza Borrego) there is a narrow spot that looked like this when I took this picture in May of 2009. It also looked the same when we did the club run there in November of 2009.
This is what it looked like yesterday (Tuesday 3/23/10).
Actually, it's not as tight as it looks, there is more than enough room to get around the new addition to the canyon floor. Gives you something to think about though.