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1935年以前,在美国西部修建了不少混凝土面板堆石坝,一般坝高较低,不超过25米,最高达100米,如1931年完工的加洲的Salt Spring坝,坝高100米,混凝土面板厚30～97厘米;这期间的施工方法是抛填堆石,沉陷大,从而导致混凝土面板裂缝漏水,甚至蓄不住水.1935—1960年间,混凝土面板坝修了不少,最高达250米,如1955年完工的萄葡牙的Paradela坝,坝高112米,混凝土面板厚30—112厘米,但由于施工方法没有改变,有的坝漏水很厉害,但是没有垮坝的.因而,到60年代人们还认为这种坝型不会太成功.
Prior to 1935, a number of concrete-faced rockfill dams were built in the western United States, generally with low heights of no more than 25 meters and a maximum of 100 meters. As the Salt Spring Dam completed in 1931 in California, the dam was 100 meters high, The concrete slab is 30 to 97 centimeters thick. The construction method during this period is to throw the fill rockfill and the big settlement, leading to the leakage of the crack in the concrete slab, even the water can not be saved. During 1935-1609, the concrete slab dam repaired a lot of up to 250 For example, the Paradela dam in Portugal, completed in 1955, has a height of 112 meters and a concrete slab thickness of 30-112 cm, but due to the unchanged construction method, In the 1960s, people also thought that this type of dam would not be too successful.