- Nez Perce National Historic Trail Foundation NPNHT Foundation, P.O. Box 1939 Lewiston, ID 83501 Email: Nez Perce NHT Foundation The US Forest Service has a good web site on the NPNHT that is found at the following link: US Forest Service, Clearwater National Forest: (http://www.fs.fed.us/npnht/) We are continuing to find ways to bring you improved web site service. Until our transition is ...www.public.iastate.edu/~sfr/npnhtf/npnhtf.html