Apache Lake is formed by Horse Mesa Dam impounded the Salt River, which was completed in 1927. The second largest of the four Salt River Project reservoirs, Apache Lake is located about 5 miles (8 km) downstream from Theodore Roosevelt Lake (the largest), and upstream from Canyon Lake and Saguaro Lake.
The surface area of the lake is 2,568 acres (1,039 ha) at full capacity and it can store 254,138 acre·ft (313,475,000 m3) of water.
Apache Lake is a popular recreation destination within the Tonto National Forest, which is the authority that manages the facilities located at the lake. The lake is located along the Apache Trail and a number of other hiking trails can be found in the area. Situated along Apache Lake is Apache Lake Marina and Resort, which offers visitors various amenities. The resort includes 3 motels, an RV park, a gas dock house, a restaurant and bar, wet and dry boat storage slips, and a general store. Apache Lake Marina and Resort is the only development along Apache Lake that offers motel rooms and campgrounds with full hook ups.