Southwest Hydrology

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The Re-emergence of the Colorado River Delta

Volume 3 Number 1

January/February 2004

The Colorado River Delta covered roughly two million acres of riparian corridors and wetlands when the Europeans first arrived in the area in the 1500s. Dam construction on the river that began in the 1930s and lasted for four decades severely reduced and frequently cut off altogether the flow into the delta during that time. Today the delta covers only about 420,000 acres, but it remains an ecological oasis rich in biodiversity, providing habitat to more than 350 species of birds. Increased river flow in recent decades has helped the ecosystem to recover somewhat; management decisions made now will determine its future. Our feature authors look at the changes in streamflow and riparian habitat over the decades, water quality, water management, and cross-border and grass-roots restoration activities in the delta.

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Publishing Southwest Hydrology furthers
SAHRA's mission of promoting sustainable
management of water in semi-arid regions.