We visit this camp ground multiple times a year. It is a donation camp ground with electric hookup (30 & 50 amp). The city park is a quick walk. Wonderful little site, be aware there is train tracks that run next to the park. While there are not a lot of trains that go through you will hear a loud train once in a while.
We made a pit stop here on the way North and were impressed with this hidden gem. There's about a dozen RV spots with electric hookups, a public bathroom, picnic areas, folfing, and several playground areas. You pay what you can for a donation, with a four night limit.
No kidding, FREE CAMPING with HOOKUPS! Flush Toilet and the pool is a short walk away and I was told you could use the showers for free! (the pool looked inviting also)
Stromsburg has a Swedish festival (Cancelled this year-COVID) but also has this great First Friday thing with live music in the square, fireworks off the roof, fire baked Pizza and other very cool concessions, wine tasting, and more.
This is a way cool local thing, so the First Friday does not over crowd the camping area.