Rend Lake · Illinois
Overview South Marcum Campground is located on the south-eastern shore of Rend Lake— the perfect place to enjoy a wide variety of activities, events, and nature at its best. Rend Lake is made up of 20,633 acres of water and 19,523 acres of land. Whether you're looking for high adventure, a peaceful retreat, or something in between, you'll find it here in the heart of Southern Illinois.
Sites at South Marcum Campground are reserved through Recreation.gov. Sites here can be reserved in advance through the official system, and they are claimed fast — cancellations then trickle back all season, unannounced, at any hour of the day or night.
| Total sites | 160 |
|---|---|
| Site types | Standard, RV, Walk-to / hike-to |
| Hookups | Electric hookups at some sites |
| Location | Benton, IL |
| Book through | Recreation.gov |
| Official listing | Recreation.gov |
Because sites are booked months ahead, a steady share of reservations get cancelled as trips fall through. Each cancellation instantly returns that site and those nights to the official calendar — first-come, first-served, no waitlist, no announcement. Refreshing the booking page yourself, every few minutes for weeks, works in theory. In practice, the people who get these sites are the ones who hear about the opening first.
ItOpened scans the Recreation.gov calendar for South Marcum Campground around the clock. When a site matching your dates and your vehicle opens, you get a text with a direct link to it. You book it yourself, in your own account, at the normal price. We never book, hold, or resell — your fee pays for monitoring, and openings are first-come, so speed is the whole game.
| South Sandusky Campground | Cancellation alerts available |
|---|---|
| North Sandusky Campground | Cancellation alerts available |
| Gun Creek | Cancellation alerts available |
| North Marcum Day Use Area | Cancellation alerts available |
| North Sandusky Day-Use | Cancellation alerts available |
| South Sandusky Day Use | Cancellation alerts available |
| Dale Miller Youth | Cancellation alerts available |
| Dam West Area (Day-Use) | Cancellation alerts available |
| Shagbark Group Area | Cancellation alerts available |
| South Marcum Day Use | Cancellation alerts available |
| Spillway Group Area | Cancellation alerts available |
Page data refreshed 2026-10-29. Site facts come from the official directory listing for South Marcum Campground; cancellation statistics come from our own scanning logs.