I turns out that a few of the workers at PSR live in Darwin and told us some interesting things about living so close to the military base.
We rode to Darwin on day 4 of our trip from PSR on the Old Toll Road. This road was also affected by the flash flood in August and 700 feet of water pipe to PSR was destroyed. They had it all back together by the time we stayed there.
Old Toll Road will be a challenge on an adventure bike especially riding west. It was even a challenge on our dual sports but slow and steady was the theme and by now, we had ridden so many miles of rocks that it was beginning to seem normal. We all set our suspensions to the softest settings.
Darwin is worth checking out and there is a paved road into town from highway 190 if you don't want to ride in on dirt.
We rode south on a dirt road out of Darwin until we reached the military base border. Nothing much to see there.
Then we rode south/east on Ophir road and went to the China Garden.
Other than the rocks and washout conditons, Ophir and Old Toll Road have some great views.