Cam Honan:
Last month I hiked the length of Badlands National Park from Ben Reifel Visitor Center to White River Visitor Center. To the best of my knowledge, it was the first time that such a traverse had been completed. …
Distance: 90 miles approx.
Time: 5 days
Read the excellent trip report – Badlands Traverse – Trip Report
besthike.com 
Lovely pictures