然而，自从四十年前建起格兰峡谷大坝，仅大峡谷上游唯有能从微小的、无坝的支流中收集到沉积物。
However, in the four decades since thebuilding of the Glen Canyon dam, just upstream of the Grand Canyon, the onlysediment that it has collected has come from tiny, undammed tributaries.
这是格兰峡谷的一部分，是紧靠格兰峡谷大坝的下游处。这个大坝位于美国亚利桑那州的科罗拉多河上。
A portion of Glen Canyon, just downstream of Glen Canyon Dam on the Colorado River in Arizona, United States.
这是格兰峡谷的一部分，是紧靠格兰峡谷大坝的下游处。这个大坝位于美国亚利桑那州的科罗拉多河上。
A portion of Glen Canyon, just downstream of Glen Canyon Dam on the Colorado River in Arizona, United States.
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