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USGS NRP Tucson: Landscape Change in the Southwest

Changes in Riparian Vegetation in Arizona

Gila River at Calva (09466500), June 18, 1964

Image of Gila River at Calva (09466500), June 18, 19164.
Raymond M. Turner In the intervening 32 years, the highest discharge through this reach was 27,900 ft3/s in 1942. Dense tamarisk has become established, creating a floodplain where the main channel once was. The channel has shifted to the right and is much smaller than it was in 1932.

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