Tent campsites near Johnsonville, Illinois primarily concentrate on the shores of Rend Lake, a 19,000-acre reservoir created in 1970. The lake features over 160 miles of shoreline with camping areas managed by the U.S. Army Corps of Engineers. Summer temperatures typically range from 80-90°F with high humidity, while spring and fall offer milder conditions between 60-75°F.
What to do
Swimming access: North Marcum Day Use Area provides a maintained beach area on Rend Lake that serves as a popular swimming spot during summer months. A camper noted, "This is an beautiful little beach on Rend lake... the beach is also tidy and free of alot of trash" (North Marcum Day Use Area).
Birdwatching opportunities: The wetlands surrounding Rend Lake attract numerous migratory bird species throughout the year. According to one visitor, "The lake is an important bird habitat making it a great place for my fellow bord watchers to go!" Bring binoculars and visit during early morning hours for optimal viewing.
Fishing expeditions: Rend Lake is stocked with crappie, catfish, and bass. Fishing is permitted from the shoreline at most campgrounds with a valid Illinois fishing license, which costs $15 for residents and $31.50 for non-residents. Morning and evening hours typically yield the best catches.
What campers like
Well-maintained facilities: The U.S. Army Corps of Engineers receives consistent praise for their upkeep of the camping areas. One camper shared, "Just beautiful, the Corp of Engineering's really take care of these camp grounds, very clean, most have new showers" (Spillway Group Area).
Lake accessibility: Most tent sites are situated within walking distance of the shoreline, allowing for convenient water access. The gradual slope of the lake bottom near designated swimming areas makes it particularly suitable for families with young children.
Quiet environment: Despite its popularity during summer months, the extensive shoreline means camping areas rarely feel overcrowded. Weekday camping, particularly in spring and fall, offers the most secluded experience with temperatures typically ranging from 60-75°F.
What you should know
Seasonal considerations: The Johnsonville area experiences hot, humid summers with temperatures regularly exceeding 85°F. Most tent campsites near Johnsonville, Illinois have limited shade, so bringing canopies or shade structures is recommended from June through August.
Reservation system: While some campsites are first-come, first-served, many can be reserved in advance through the Recreation.gov website. Sites at North Marcum Day Use Area fill quickly on summer weekends and holidays, so booking 2-3 months in advance is recommended.
Varying campground policies: Campground rules differ significantly between locations. Some areas prohibit alcohol, pets, or open fires, while others have specific quiet hours or length-of-stay limitations. Check individual campground regulations before arriving.
Tips for camping with families
Beach safety: The swimming areas at Rend Lake maintain gentle slopes appropriate for younger swimmers. One visitor commented the beach is "perfect for the youngsters to play in." No lifeguards are present, so adult supervision is required at all times.
Insect preparation: The lakeside location means mosquitoes are common, particularly in evening hours from May through September. Pack child-safe insect repellent (with 10-30% DEET or picaridin alternatives) and consider bringing a screened canopy for eating areas.
Educational opportunities: North Marcum Day Use Area occasionally hosts ranger-led programs during summer months that focus on local wildlife and ecology. These typically last 30-45 minutes and are designed for elementary-aged children, though schedules vary seasonally.
Tips from RVers
Limited hookup availability: While tent camping is widely available, full-hookup RV sites are more limited near Johnsonville. Those requiring water, electric, and sewer connections should reserve well in advance or consider dry camping options during peak season.
Access considerations: Most campgrounds near Johnsonville feature paved roads leading to camping areas, though some sites themselves may be on grass or gravel surfaces. During rainy periods, tent sites can become saturated quickly, so bringing extra ground tarps is advisable.
Supply planning: The nearest substantial grocery stores and camping supplies are located in Benton, approximately 15 miles from most Rend Lake camping areas. Stock up before arriving at Spillway Group Area as on-site stores are limited or non-existent at most campgrounds.
