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CHANGES IN RIPARIAN VEGETATION IN THE SOUTHWESTERN UNITED STATES:
Repeat Photography at Streamflow Gaging Stations

VIRGIN RIVER AT LITTLEFIELD (09415000)

Photo (June 4, 1942). This downstream view from a bluff above the Virgin River shows the gaging station at Littlefield, Arizona, in the extreme northwestern part of Arizona. The channel was relatively wide and free of vegetation, with cottonwoods along river right (right side of the photo) and mesquites and tamarisks along river left. Although the river is used extensively for irrigation and domestic water supply, no dams have been built across the main channels (James Baumgartner, #3601).
   
(October 30, 2000). Despite several large floods in the intervening 58 years, including a January 1,1989, flood caused by the breaching of an off-channel dam upstream, riparian vegetation has increased in this reach. Most of the foreground vegetation is native, including cottonwood trees, arrowweed, mesquite, and catclaw. At lower right, a marsh containing reeds, cattails, and phragmites has developed. On river left, native coyote willow lines the bank, and a prominent zone of tamarisks with occasional cottonwood appears behind. The vertical bank at center is in a small floodplain terrace that developed after 1942 (Dominic Oldershaw, Stake 1727). photo
 
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