Boundary Dam Vista House is 11 mi. n. on SR 31 to the access road at Crescent Lake, then 2 mi. w. on E. Side Road. The Vista House is perched on cliffs above the east side of the Pend Oreille River, overlooking Boundary Dam. Exhibits cover such subjects as the hydroelectric project, indigenous wildlife and the border patrol. A trail loops down to an overlook, cantilevered over the edge of the canyon high above the dam; the view is spectacular. There is no dam access from the Vista House.