Spider guarding its eggs

I'm afraid this spider had an unexpected and unintentional ride through Fish Creek Park yesterday afternoon. I was on a walk with two guys who, on every bird walk or botany walk (for many years) have picked up every piece of garbage, everything from old, discarded tires to cigarette butts. We came across this long piece of rusty metal and it wasn't till we got it back to the parking lot that we noticed this spider guarding her eggs. I think this is a Wolf Spider.