building a containment dome, a four-story 70-ton structure the company is going to lower over one of the three leaks in attempt too catch the escape out. oil. the other domes to be finished tomorrow, with all three to be installed over the weekend coming up. the associated press reporting that shipping along the mississippi river, though, could soon be limited, the slick moving precariously close to a key shipping lane, the southwest pass, which allows ships carrying food, rubber and, yes, oil, to enter that waterway. the latest map from noaa making it appear as if the massive oil slick has shrunk. tomorrow's projection is in mustard yellow. scientists saying wind and currents braking it up but the volume of oil is expected to grow. reverberations far afield, governor schwarzenegger tonight announcing he is withdrawing his support from a state plan to expand oil drilling off the coast of california.