Grouted Cut-Off for the Estacada Dam

Early in 1912, the Portland Railway, Light and Power Company, which is the principal public service corporation of Portland, Ore., completed what is known as the Estacada Hydro-Electric Development. This work, which includes an Ambursen dam, 90 ft. high, with power-house and transmission line, has already been described in several technical journals, and to redescribe these features is not the object of this paper. Inasmuch, however, as the treatment of the foundation material by the grouting process is the greatest thus far attempted, it is believed that a setting forth of this particular feature of the work will prove of interest to many engineers.