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Colorado River campsite monitoring, Grand Canyon National Park, Arizona, 1998-2012

Open-File Report 2014-1161

Prepared in cooperation with Northern Arizona University
By:
, , , ,
DOI: 10.3133/ofr20141161

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Abstract

River rafting trips and hikers use sandbars along the Colorado River in Marble and Grand Canyons as campsites. The U.S. Geological Survey evaluated the effects of Glen Canyon Dam operations on campsite areas on sandbars along the Colorado River in Grand Canyon National Park. Campsite area was measured annually from 1998 to 2012 at 37 study sites between Lees Ferry and Diamond Creek, Arizona. The primary purpose of this report is to present the methods and results of the project.


Campsite area surveys were conducted using total station survey methods to outline the perimeter of camping area at each study site. Campsite area is defined as any region of smooth substrate (most commonly sand) with no more than an 8 degree slope and little or no vegetation. We used this definition, but relaxed the slope criteria to include steeper areas near boat mooring locations where campers typically establish their kitchens.


The results show that campsite area decreased over the course of the study period, but at a rate that varied by elevation zone and by survey period. Time-series plots show that from 1998 to 2012, high stage-elevation (greater than the 25,000 ft3/s stage-elevation) campsite area decreased significantly, although there was no significant trend in low stage-elevation (15,000–20,000 ft3/s) campsite area. High stage-elevation campsite area increased after the 2004 and 2008 high flows, but decreased in the intervals between high flows. Although no overall trend was detected for low stage-elevation campsite areas, they did increase after high-volume dam releases equal to or greater than about 20,000 ft3/s. We conclude that dam operations have not met the management objectives of the Glen Canyon Adaptive Management program to increase the size of camping beaches in critical and non-critical reaches of the Colorado River between Glen Canyon Dam and Lake Mead.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Colorado River campsite monitoring, Grand Canyon National Park, Arizona, 1998-2012
Series title:
Open-File Report
Series number:
2014-1161
DOI:
10.3133/ofr20141161
Year Published:
2014
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Southwest Biological Science Center
Description:
Report: iv, 24 p.; Appendix A
Number of Pages:
32
Time Range Start:
1998-01-01T12:00:00
Time Range End:
2012-12-31T12:00:00
Country:
United States
State:
Arizona
Other Geospatial:
Colorado River;Grand Canyon National Park
Datum:
North American Datum 1983
Projection:
Arizona State Plane Projection
Online Only (Y/N):
Y
Additional Online Files(Y/N):
Y