Openings · last 7 days
0
01 · Detected Opening History · the openings record · file CS-233370
When Spillway Group Area reopens
Spillway Group Area's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
1
Openings · last 90 days
1
Only 1 opening in the last 90 days: not enough recent activity for a reliable pattern. A free Campsite Sniper alert watches around the clock instead, and pings you the moment one opens.
02 · Availability Outlook · Sep 18, 2026 – Mar 19, 2027 · of 1 monitored site
Of the 183 tracked reservation dates (Sep 18, 2026 – Mar 19, 2027): 181 open for online reservation · 2 reserved.
Where the open windows are
1.1% of tracked reservation dates are not currently open for online reservation. 181 of 183 remain open; here is where they are.
Load status
Sep 18, 2026 – Mar 19, 2027Not open online1.1%
Open reservation dates181 / 183
Reserved (of online inventory)2 / 183
Weekday openings104
Weekend openings77
Of the open reservation dates on mapped day-use units, 104 fall on weekdays and 77 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Mar 2027December holds the most room. 31 of 31 reservation dates are still open there.
Holiday windows — day use
Units open per date · of 1 day-use unit| Window | Date | Units open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open | |
| Thanksgiving | THU Nov 26 | 1 | Open |
| FRI Nov 27 | 1 | Open | |
| SAT Nov 28 | 1 | Open | |
| Christmas | THU Dec 24 | 1 | Open |
| FRI Dec 25 | 1 | Open | |
| New Year | THU Dec 31 | 1 | Open |
| FRI Jan 1 | 1 | Open |
Labor Day: no online availability on any tracked date. Thanksgiving: 1 day-use unit is available for all three dates. Christmas: 1 day-use unit is available for both dates. New Year: 1 day-use unit is available for both dates.
Availability by day-use unit
Most open reservation dates · tracked window| Unit | Open reservation dates |
|---|---|
| Group Area 1 | 181 |
This day-use unit currently has 181 reservation dates available.
Next windows
As of Sep 18, 2026 snapshotNext open dateFri · Sep 18
Next open weekendFri · Sep 18
The next bookable date is Sep 18; the first open weekend starts Sep 18. Campsite Sniper can watch later dates for you.
Reservation dates
181 available reservation dates across 1 day-use unit at Spillway Group Area, from the same hourly snapshot as everything above.
All 1 day-use unit with current availability
| Unit | Open reservation dates | Consecutive dates | Dates |
|---|---|---|---|
| Group Area 1 | 181 | 146 dates | Sep 18, Sep 19, Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30 +169 more |
About Spillway Group Area
Overview
Spillway Recreation Area— the perfect place to enjoy a wide variety of activities, events, and nature with the best sunsets of Southern Illinois. 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!
Recreation
Within the area, visitors can access the Rend Lake Bike Trail—over 20 miles of paved pathways that guide riders through scenic woodlands and across views of Rend Lake and the Big Muddy River. The area offers abundant opportunities for boating, hiking, fishing, hunting, swimming, and general outdoor exploration. Additional recreation features around Rend Lake include an archery complex with a 3D trail and elevated shooting platform, a dog park with a swimming feature, and two public swimming beaches (including the pet-friendly North Marcum Beach).
Facilities
Spillway Group Area offers 10 acres for company picnics, weddings, church gatherings, family reunions and many other outdoor events. The area includes a large shelter (250 capacity) with electricity and overhead lighting, an amphitheater (250 capacity), and a small gazebo (30 capacity), a swingset, and direct access to the Rend Lake Bike Trail. The area also offers picnic tables, flush toilets, and drinking water in order to provide a comfortable experience for guests.
Natural Features
The fields, forests, and waters of Rend Lake provide a natural haven for wildlife and an outdoor wonderland for you. Woodland areas are made up of hickory, oak, and beautiful maples providing habitat to white-tail deer, turkeys, racoons, and many more native species. The shorelines are an excellent viewing area for waterfowl, shorebirds, and bank fishing the known crappie population.
1 monitored unitDay use1 shadedWaterfrontLakefrontMax party 2,000
Getting there
From I-57: Take take exit 71 and turn west onto Highway 14. After 3 miles turn right on Rend City Road, then right on Rend Lake Dam Road. Continue 3 miles to the park entrance on the left.
Rend Lake Project Office, Benton, IL 62812618-724-2493
BikingBirdingDay Use AreaFishingPicnickingStar GazingWater AccessWildlife Viewing
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-233370 · facility + sites
Photo gallery
Roll CS-233370 · Spillway Group Area · Benton IL12 frames · facility + sites
FAQ
How do I get a reservation at Spillway Group Area?
Reservations for Spillway Group Area are made through Recreation.gov. The current snapshot shows substantial availability: 181 of 183 tracked reservation dates are open (98.9%), though availability can change. Campsite Sniper has also detected 1 site opening here in the last 90 days, so further dates may appear. Pick the unit on the map to see its reservation calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this facility for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 17:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
How often do new openings appear at Spillway Group Area?
Campsite Sniper detected 1 site-date opening here over the last 90 days, none in the last 7. A free alert watches around the clock and pings you the moment one appears.
Which month has the most availability at Spillway Group Area?
December 2026, with 31 open reservation dates in the current snapshot of 31.
When is the next open date at Spillway Group Area?
As of the Sep 18, 2026 snapshot: the next open date is Fri, Sep 18 and the next open weekend starts Fri, Sep 18. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
Let the app watch this shelter
Pick dates
Choose the reservation dates you want at Spillway Group Area.
Watch
Campsite Sniper can monitor this facility and notify you if a selected date becomes available.
Get the ping
When a selected date becomes available, you get a push with a Recreation.gov link so you can review and book it yourself.