No detected openings were recorded in the last 90 days. Campsite Sniper monitors Boulder Day Use continuously and will alert you if that changes.
Of the 13 tracked reservation dates (Sep 18 – Sep 30, 2026): 12 open for online reservation · 1 reserved.
Where the open windows are
Load status
Sep 18 – Sep 30, 2026Of the open reservation dates on mapped day-use units, 7 fall on weekdays and 5 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Sep 2026September holds the most room. 12 of 13 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 |
Labor Day: no online availability on any tracked date.
Availability by day-use unit
Most open reservation dates · tracked window| Unit | Open reservation dates |
|---|---|
| G001 | 12 |
This day-use unit currently has 12 reservation dates available.
Next windows
As of Sep 18, 2026 snapshotThe next bookable date is Sep 18; the first open weekend starts Sep 18. Campsite Sniper can watch later dates for you.
Reservation dates
All 1 day-use unit with current availability
| Unit | Open reservation dates | Consecutive dates | Dates |
|---|---|---|---|
| G001 | 12 | 8 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 |
About Boulder Day Use
Overview
Boulder Day Use Area is situated on the eastern shore of Carlyle Lake, a prime getaway for city-dwellers and families. Located 50 miles east of St. Louis, the area offers the peaceful retreat of a small town combined with the grandeur of Illinois' largest man-made lake.
Recreation
Boulder Day Use Area provides fun both on the water and on shore. A boat ramp and courtesy dock are provided, and the vast lake allows for plenty of water sports. Fishing is a popular pastime, and the lake offers year-round varieties of fish such as bluegill, crappie, channel catfish, flathead catfish, white bass, largemouth bass, freshwater drum, carp and walleye. There is an on-site playground and plenty of wide open space for children to play. A multi-use biking and walking trail is located a short drive away at the main dam.
Facilities
Boulder Day Use Area provides modern amenities like flush toilets and drinking water, as well as one reservable group picnic shelter that can accommodate up to 75 people. Boaters have the convenience of a marina, boat ramp and fish cleaning station. It is adjacent to the Boulder Recreation Area, which offers reservable campsites.
Natural Features
Created in 1967, the 26,000-acre lake is recognized as one of the nation's top ten inland sailing lakes and hosts several races and regattas. The lake is home to an array of wildlife that can be seen throughout the year. Its waters and shores are a resting spot for migratory waterfowl and other birds, and there are six established Watchable Wildlife Sites with viewing towers open to the public around the lake.
Nearby Attractions
The Carlyle Lake Visitor Center, located in the Dam West Recreation Area, has information available and nature exhibits on display, including a 215-gallon aquarium with native fish.
Getting there
(Address: 25501 Boulder Access RD, Shattuc, IL 62231). From I-57, take Old U.S. Highway 50 west. Continue for 19 miles through Salem, Odin and Sandoval. Turn north on Boulder Road and follow 7 miles to the day use and recreation area.
View on Recreation.gov ↗ Get directions ↗
Photo gallery
FAQ
How do I get a reservation at Boulder Day Use?
Reservations for Boulder Day Use are made through Recreation.gov. The current snapshot shows substantial availability: 12 of 13 tracked reservation dates are open (92.3%), though availability can change. 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 16:19 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.
Which month has the most availability at Boulder Day Use?
September 2026, with 12 open reservation dates in the current snapshot of 13.
When is the next open date at Boulder Day Use?
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
Choose the reservation dates you want at Boulder Day Use.
Campsite Sniper can monitor this facility and notify you if a selected date becomes available.
When a selected date becomes available, you get a push with a Recreation.gov link so you can review and book it yourself.