Lacey-Keosauqua State Park

Area A is located in the northwest corner of the park. Its historic buildings and structures include the gatehouse and portals, a regulatory sign, lodge, pump house, and picnic shelter. Two rubble limestone portals flank the entrance road. The south portal is nearly square and is 8.3 feet (2.5 m) tall.[3] The north portal is T-shaped and stands 9 feet (2.7 m) tall. The sign stands in front of the north portal. The rectangular, random rubble limestone gatehouse is separate from the portals and is located to the south of them. The lodge is a two-story, L-shaped building that is located on the main road just beyond the portals.

The main section of the structure is covered with weatherboard, and an addition is covered with uncoursed rubble. A wrap-around porch composed of stone walls covers the east side of the building and parts of the adjoining north and south facades. The underground pump house lies to the east of the lodge and is marked by its double-wooden doors. The picnic shelter is one-quarter of a mile to the southeast of the pump house. The shelter is composed of uncoursed ashlar limestone, and it is built into the side of a hill. Restrooms are located in the enclosed rear portion of the structure, and the north side is open.

Area B is located in the north central part of the park. Its historic buildings and structures include the custodian's residence, a picnic shelter, a water fountain, two latrines, and several retaining walls at the entrance of the picnic shelter. Located in a clearing off the park road, the custodian's residence is a single-story, rectangular structure composed of rough-faced, coursed ashlar limestone. The gable ends are closed with weatherboard. It is built over a limestone basement.

The picnic area is located to the northeast of the custodian's residence. Coursed ashlar limestone encloses the rear of the shelter, and includes a fireplace. Two latrines, of coursed rubble limestone and similar in construction, flank the shelter. The water fountain is located southwest of the shelter. The entrance to the picnic area is marked by four square cement posts that are flanked by two coursed ashlar stone walls. Two 408-foot (124 m) long stone walls are located in the center of the grass parking lot.[5]

Area C is located to the south of Area B near the center of the park. It is the bathing area and it includes the lake, dam, spillway, trail surrounding the lake, the check dams and footbridge along this trail, bathhouse, beach, and pump house. Two bridges in this historic district are considered non-contributing to the historical nature of the district. The 30-acre (12 ha) lake is fed by a spring that is damned at the north end of the lake. The earthen dam with a concrete core is 450 feet (140 m) in length.[6] Rock riprapping protects its south side from erosion. A 300-foot (91 m) concrete spillway curves to the west. A 55-foot (17 m) arched, steel bridge (non-contributing) spans across the spillway. Most of the lake is surrounded by a 3.25-mile (5.23 km) trail. Ten check dams that prevent soil erosion into the lake are located along the trail. They are composed of random rubble and concrete walls. Two coursed rubble limestone footbridges are located south of the lake. One of the two bridges is a WPA structure, and is non-contributing. The bathhouse is located near the top of a hill on the west side of the lake. The single-story uncoursed ashlar limestone building was built on concrete footings. It features a central gable with a cupola and two flanking wings. Concrete steps with random rubble side walls lead down to the beach on the lake. An uncoursed ashlar limestone pump house is built into the hillside. It has a flat roof that is also composed of limestone.