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Stanton Repeat Photography

Mile 51.5, Upstream from Little Nankoweap Creek, Downstream View from River Left (Stake 2312a)

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Stake 2312a, 17 January 1890 View Larger Image
17 January 1890
Sand bars line the river corridor in this image, and the vegetation on the slopes includes Anderson thornbush, Mormon tea, and berry and grizzlybear pricklypear. Mesquite grows densely in the right midground in what would become known as the old high-water line. Biological soil crusts are clearly present throughout the foreground.
Photo credit: Robert B. Stanton, 57-RS-353, courtesy of The National Archives

Stake 2312a, 4 February 1991 View Larger Image
4 February 1991
The sandbars are fewer and smaller with establishment of riparian vegetation and erosion, while the mesquite thickets above remain dense. Other riparian vegetation, notably non-native tamarisk, now lines the river corridor. On the foreground slope, there has been a marked increase in the biomass of cacti, with some of the pricklypear persisting the century. Mormon tea, particularly the ones in the right and left foreground, and Anderson thornbush, notably the one at lower left center, persist the intervening 101 years, and the biological soil crusts remain prominent.
Photo credit: Ted Melis

Stake 2312a, 18 September 2010 View Larger Image
18 September 2010
Many of the individual plants visible in 1991 persist, including the Mormon tea individuals in the right and left foreground and the Anderson thornbush at lower left center. The biological soil crusts remain prominent in this view, showing the persistence and stability of this landscape feature. Both desert and riparian vegetation have increased in density and in number, with the increase in riparian vegetation as particularly obvious. Only a small area of open sand remains behind a veritable wall of tamarisk next to the Colorado River at right (channel left).
Photo credit: John Mortimer

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