The total width of this narrow section of the valley, as measured between the uplands of Ohio and Kentucky, is about 1.5 km, compared to a width of 2.5 km upstream and 4.0 km downstream. The narrow part of the valley lacks a continuous flood plain or terraces and essentially consists of
slopes of colluvium from the level of the Ohio River to ledges of limestone outcrop near the top. Landslides have occurred along these slopes on both sides of the Ohio River. In 1973, extensive landsliding resulted in temporary closure of a 5-km stretch of State Route 8 west of Bromley, Ky. (fig. 1), and in the destruction of several homes. At the same time, in Ohio, landslides were destroying homes and sections of several roads. As part of this widespread landslide disaster,