http://www.opb.org/programs/lewisandclark/index.html
Here's a new Radio series from Oregon Public Broadcasting-
You can listen live,
http://www.opb.org/programs/streams/
but don't know whether they'll stick episodes in the Archives.
Perhaps KCUR can acquire it to run back there.
Lewis and Clark and the Oregon Trail are Revered, rather than Denigrated, out this way.