The Central Illinois Landmark Foundation on July 20 officially designated the Detweiller Marina and Playground as a landmark, citing its historical significance and distinctive architecture.
Donated to the community through a trust by Thomas Detweiller, the land is where, a few years after Marquette and Joliet first explored the Illinois River…
* La Salle first camped with the area’s indigenous people in 1682. Across the river, he and Henri Tonti established Fort Creve Coeur which was destroyed in a mutiny a few months later.
* In the 1700s, Jean Baptiste du Sable lived in the French settlement in Peoria, married a Potawatomi woman and worked the land before moving north settling in what became Chicago.
* In the early 1800s, Jim Bridger – who became a well-known scout, frontier explorer and mountain man – lived and learned gunsmithing by the Potawatomi people.
* And in 1858, a 1,000-year-old headdress ornament made of embossed copper was discovered in a burial mound here. Subsequently called the “Peoria Falcon,” the important artifact is now held by the Smithsonian Institution.
“Landmark” designations note sites worth preserving and protecting, according to Landmark Illinois, a private nonprofit whose mission is “people saving places for people. Historic preservation is the act of conservation and protection of these buildings, sites, objects and landscapes that are significant to our personal or shared stories. Designation as a local landmark or contributing to a local landmark district offers protection through a local historic preservation ordinance.”
Peoria has had such an ordinance since the 1970s. administered through the Peoria Historic Preservation Commission. The state of Illinois has several related laws, including the Historic Preservation Act. Nationally, sites can be recognized as a National Historic Landmark and/or listed by the National Register of Historic Places.
“Today, we’re taking a first step,” said Blair Gambill of the Central Illinois Landmark Foundation (CILF). “We’ll be applying for state and national designations, too. This is a big deal.”
Besides the history, the Marina’s Harbor House, built in 1963 and designed by respected local architect Cletis Roy Foley is noteworthy, said Molly Bishop, also with the CILF.
“It represents mid-century architecture and design excellence,” she said, citing key traits, “embodying Modernist principles of functional planning, structural expression, and environmental adaptation through its elevated, flood-resistant design and expansive, river-oriented public spaces.”
Foley designed hundreds of projects throughout the area, including churches, schools, civic buildings and recreational facilities, such as the Motherhouse of the Sisters of St. Francis, the downtown YMCA, and CILCO’s headquarters, Bishop said.
Designed as the marina clubhouse and service building for the Detweiller Playground Trust, which is seeking to sell the property to nearby O’Brien Steel, the recently neglected harbor house was constructed, “unlike traditional buildings that conceal structure,” with steel columns, heavy beams and exposed framing beneath the decks, and features public-gathering and meeting spaces, an office, concession area, public restrooms and showers, maintenance/storage below, an unusually large hip roof with a square structure rising from its center, and an observation deck overlooking the river,” Bishop said. Throughout, “rather than making the building a decorative object, Foley's architecture emphasized proportion, light and practicality.
Gambill added, “Together, all these elements tell a rich story of Indigenous heritage, early European exploration, frontier history, and mid-century architecture. Designating this site helps preserve that history for future generations.”
The late Peoria architect Les Kenyon was instrumental in establishing the Central Illinois Landmark Foundation as a nonprofit organization dedicated to identifying, preserving, and promoting the historical sites, architectural heritage, and cultural landmarks of Central Illinois, from the G.A.R. Hall and the Central Building to City Hall and homes on Moss Avenue. This year marks the organization’s 50th anniversary.
