Home Archived May 12, 2018

Stanton Repeat Photography

Mile 75.5, Nevills Rapid , Upstream View from River Right (Stake 1445)

Viewing Grand Canyon Site 56 of 119 Return to Main Stanton Index

Stake 1445, 25 January 1890 View Larger Image
25 January 1890
Stanton and his crew watched the rising walls of Shinumo Quartzite with concern. The narrow canyon meant the rapids ahead would be more severe. While the crew lined what is now called Nevills Rapid, Stanton made this upstream view at 8:15 AM. The fresh-looking deposit in the midground, which does not have any overlying sand from the Colorado River, indicates a debris flow occurred the previous summer. The large boulder at right center is approximately 12 feet in diameter. Driftwood in the right foreground indicates that the river regularly inundated the entire debris fan.
Photo credit: Robert B. Stanton, 57-RS-407, courtesy of The National Archives

Stake 1445, 27 January 1990 View Larger Image
27 January 1990
75-Mile Canyon has produced numerous debris flows in the last century, not the least of which is the removal of driftwood high on the debris fan. Changes in the foreground boulders are evidence of one of these debris flows; scars in catclaw trees indicate this flow occurred in 1959. The extensive deposition at the main part of the debris fan occurred during a debris flow in August 1987; note the burial of the large boulder that was more distinct in 1890. Riparian and desert vegetation in the foreground includes longleaf brickellbush and sweetbush. Upstream of the debris fan, tamarisk, coyote willow, and arrowweed grow on a sandbar and the more stable part of the debris fan.
Photo credit: Ralph Hopkins

Stake 1445, 10 February 1991 View Larger Image
10 February 1991
In September 1990, another debris flow occurred in 75-Mile Canyon. Boulders up to 8 feet in diameter were deposited during this flood. Note that the large boulder at right center has another 1-to-2 feet of material deposited around it. The debris flow removed some of the vegetation on the debris fan but left longleaf brickellbush and sweetbush in the foreground.
Photo credit: Ted Melis

Stake 1445, 28 October 2001 View Larger Image
28 October 2001
The large boulder once prominent at right center, is no longer visible because of aggradation on the debris fan. More debris flows, in 1993 and around 1999, have again altered the view, burying some of the tamarisk established after 1991 to a depth of 6 feet. More vegetation, mostly longleaf brickellbush and tamarisk, has become established on the debris fan, and brittlebush is clearly apparent among persistent plants in the foreground.
Photo credit: Robert H. Webb

Stake 1445, 30 October 2003 View Larger Image
30 October 2003
A debris flow in 2003 deposited a new line of boulders across the midground, burying or removing some of the tamarisk trees. The tamarisk that survived, on the upstream side of the boulder deposit, are still in leaf. Some of the plants in the foreground are the same as those in the 2001 image, with the addition of Mormon tea, more brittlebush, and seepwillow.
Photo credit: Dominic Oldershaw

Stake 1445, 6 March 2005 View Larger Image
6 March 2005
Two years later, the view appears quite similar to that in 2003. The tamarisk are leafless so are less apparent, giving the false impression that the seepwillow, arrowweed, and longleaf brickellbush are gaining in density and biomass. Many of the same shrubs are visible in the foreground.
Photo credit: Steve Young

Stake 1445, 20 September 2010 View Larger Image
20 September 2010
No debris flows occurred in the five years between 2005 and 2010, allowing an explosion of riparian vegetation on the debris fan. The existing plants have grown considerably, and the tamarisk is leafed out, revealing its prominence on the upstream side of the debris fan as well as along the shore of the Colorado River through Nevills Rapid. The view of the river is mostly obscured by the debris fan and vegetation.
Photo credit: John Mortimer

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