"Tom, do you know of any source of updated information on these trail problems at Shepherd, Baxter, Sawmill, Taboose?"
I'd give the East Sierra Interagency Visitors Center a call, Bob. The guy I talked with was a serious type who actually gets out in the field, and had been up Sawmill a couple of weeks before the July storms that caused the washouts. I can't remember his name now, but if you could ask around there for someone like him, you'd likely get as much information as is available. When I reported the washout(s) on Sawmill, he took it all down and immediately sent a report in while I was there, along with a request to send someone out to evaluate the damage. Apparently they did, because it's now on the website Amy linked us to. Another possibility would be to post inquiries on highsierratopix.com later this year and see if anyone who has been up there recently responds.
I share your concerns about timely information, as my plans for this year are also potentially impacted. IIRC, you are planning something to do with Baxter. As you probably know, it is not well maintained under normal circumstances and, if it has sustained any damage, will likely not be very high on the USFS priority list. My guess would be that Shepherd Pass will be first in line, as it has become increasingly popular in the last few years. Sawmill, like Baxter, doesn't see a lot of use but, if it doesn't sustain further damage this spring, will probably be hikeable, and would put you on the JMT not too far north of Dollar Lake. Sawmill Pass is a really pretty route, BTW, especially the Woods Creek drainage on the west side.