Idaho State Highway 66

State Highway 66 (SH-66) is a state highway located entirely within Latah County, Idaho, United States. It travels for less than 1 mi from Palouse Cove Road at the Washington state line to U.S. Route 95 (US-95) north of Viola. The highway is maintained by the Idaho Transportation Department.

Route description
SH-66 begins at the Washington state line as a continuation Palouse Cove Road, which connects to the city of Palouse. From the state line, the highway travels southeast through a rural area and turns east to reach its terminus at US-95 north of Viola. The route is a two-lane undivided road for its entire length.