Anyone headed west toward Denver or the Colorado mountains and needing a spot to stop along I-76 might consider North Sterling State Park. A few miles north of Sterling, Colorado and a couple of hours NE of Denver, it might just work for some trips, and it's a well set up place. Hookups are 50a electric, but good fresh water at many spigots around the park, dump stations at the campgrounds at both ends of the park. Clean rest rooms with flush toilets, no showers. We just stayed 2 nights this week doing a trial run of our new TT. Although I didn't have much luck from shore, fishing is supposed to be pretty good for bass and walleye.
A couple of photos (we stayed at the Inlet Grove loop):