Route 66, Litchfield to Mount Olive
Why it's listed
This 9.35-mile stretch of former U.S. Route 66 runs from just north of Litchfield to northwest of Mount Olive, crossing flat farmland in Montgomery and Macoupin counties. It was built as a divided four-lane highway in two stages. The southbound lanes opened in 1943, when wartime convoys and heavy trucks had badly damaged the older road. The northbound lanes followed in 1954-1955. Each roadway is 24 feet wide and made of 10-inch concrete on a crushed-stone subbase, with a 30-foot grass median between them. The design followed limited-access standards of the period and bypassed local towns to reduce traffic tie-ups. Roadside businesses in Litchfield moved or expanded to reach the new traffic. Today the southbound lanes carry two-way traffic under a macadam overlay, while the closed northbound lanes keep their original concrete. The segment is recognized for its link to Route 66 and for its representative mid-century highway engineering, and it keeps its original cross-section and rural setting.
Significance in brief: The segment is tied to Route 66 as a major national transportation route, and it served as a strategic defense road during World War II. It is also a representative example of limited-access, federal-aided four-lane highway engineering of the 1940s and 1950s. It retains its original 24-foot cross-section, concrete pavement and 30-foot median.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 01001312, listed November 29, 2001. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | US 66, N of IL 16 in Litchfield to Mount Olive, Litchfield |
|---|---|
| County | Montgomery County |
| Listed | November 29, 2001 |
| Reference number | 01001312 |
| Resource type | Structure |
| Period of significance | Transportation 1943-1956; Engineering 1943-1955 |
| Architectural style | Other: Limited Access Four-Lane Highway |
| Criteria |
|
| Areas of significance | Transportation, Engineering |
| Level of significance | State |
| Status (as stated in the nomination) | State-owned and maintained by the Illinois Department of Transportation. The southbound lanes carry two-way traffic under a macadam overlay, and most northbound lanes are closed to traffic but still visible. |
| Acreage | 98 |
| Coordinates | 39.16349, -89.67448 (NPS GIS) |
What listing means for this property
National Register listing is honorary: it recognises significance and does not restrict what a private owner may do without federal money or permits. It unlocks the 20% federal rehabilitation tax credit for income-producing buildings, state credits in many states, and Section 106 review when federal agencies are involved. See what listing means in practice.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 01001312.
- Nomination form (PDF, National Archives) — catalog entry
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.