Looking on Google maps at the Grand Loop Road (GLR) that runs from Mammoth Hot Springs to the junction with the NE entrance road Tower Roosevelt, I noticed a long side road. The turn off is past Undine Falls and Blacktail pond. It re-joins the GLR, a few miles before the junction of the NE entrance road, and here there looks to be a No Entry sign, so I assume this side road is only one way. This road looks to be quite narrow but Tarmac not gravel.
My question is, can this road be driven on or is it a service road?Edited: 18 February 2014, 18:08