| Club information | |
|---|---|
   | |
| Coordinates | 42°14′35″N 87°50′35″W / 42.243°N 87.843°W |
| Location | Lake Forest, Illinois, U.S. |
| Elevation | 700 feet (215 m) |
| Established | 1895 |
| Type | Private |
| Total holes | 18 |
| Events hosted | 1906 U.S. Open |
| Website | onwentsiaclub.org |
| Designed by | Charles B. Macdonald Herbert J. Tweedie redesign by Tom Doak |
| Par | 71 |
| Length | 6,645 yards (6,076 m) |
| Course rating | 72.8 |
| Slope rating | 134 [1] |
Onwentsia Club is an 18-hole golf course in the central United States, located in Lake Forest, Illinois, a suburb north of Chicago.
- ^ "Course Rating and Slope Database™ - Onwentsia Club". United States Golf Association. Retrieved May 10, 2018.