A mile west of the center of Grace, Idaho, a basalt chasm shows the Bear River far below. On the south side of the bridge, a small stream makes an impressive cataract as it bounces and plunges to the river. Cacti and buckwheats stay low alongside the rocky path that leads along one cliff toward a rope-assisted crossing place where daring youngsters frolic on the rocks mid-river...in the low-water years.