We just experienced our first Corp of Engineers campground....and we did buy the $80 National pass, so our fees were only $8 for this really nice campground and even included electric.  My dh asked me where I knew to ask about this discount.....and I had to tell him from "Howard and Linda's" rv dreams site!!!  We are on our 7 month trip across the US in our very small, but serviceable 25 foot mh.  This campground on the Mississippi River near Potosi, WI was really nice, so very well kept up.  sites were level, mostly concrete pads with grassy lawns and nice picnic tables.  And a great sunset view.  So glad to have found this site to learn lots of information....we are enjoying our adventure...2000 miles now we have traveled from Washington State.  Everyone should get to experience our beautiful states.