US Army Corps of Engineers · Illinois campground guide
The numbers
Fee range
$22–$30/night
Season open
April through October
RV size limit
Up to 50 ft
Reservation window
6 months ahead via Recreation.gov
The insider read
Largest USACE camp in southern Illinois. Rend Lake bass-tournament traffic March-May; book the family-quiet weekends June-July. USACE Senior Pass halves the fee — apply at gate not online.
Original analysis from PickRV — synthesised from public sources you can verify, pulling the operational details competitor guides typically skip.
Verify at mvs.usace.army.milOn site
Book it right
PickRV doesn't handle campground bookings — reserve direct through the official channel so policies and cancellations flow through one record.
Opens recreation.gov
Every fact above is sourced from the managing agency's canonical page. Cross-check fee, season, and size limit before you depend on them.
Match the campground's size limit and hookup level to a vehicle category, then plan the rest of the trip.
Keep exploring
Near Brimfield
StateInsider tip · Historic 1839 Episcopal college site — restored chapel + period buildings open weekends. Equestrian camp area separate from RV/tent loop. Mountain bike trail system 22 miles.
Near Marshall
StateInsider tip · Memorial to the Lincoln family's 1830 Indiana-to-Illinois route. The 146-acre lake bans gas motors — paddleboard or kayak only. Sites in 'A' loop have the lake views.
Near Union
PrivateInsider tip · Closest full-hookup camp to downtown Chicago (60-min Metra train from Crystal Lake). KOA shuttle to the train weekends. Cabins are the budget-Chicago-visit play.
Near Oglesby
StateInsider tip · 18 canyons + 14 waterfalls along the Illinois River. Spring (April) frozen-falls + fall (October) leaf-peep are the two windows. The lodge restaurant Sunday brunch is the legendary local fix; sign in by 9am or wait 90 min.
Your next step
South Marcum (Rend Lake · USACE) takes rigs up to 50 ft, so what you arrive in decides whether the loop works at all. If you don't own one, the same trip runs on a motorhome rented in Illinois.
Nothing in Illinois is bookable today. Dated requests are what we take to owners, so give us the window you actually want — you get one email the day a rig covers it, and nothing else.
Nearby & related
Sourced costs, campground directories, and the places worth a detour — the next layer of Illinois trip planning.
Before you go
Illinois rules
Verified 2026-05-10
