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PDF Status and Trends of Resources Below Glen Canyon Dam Update - 2009 [More info]
Summary of changes to water quality, sediment, aquatic food, native fish, riparian vegetation, and archeological, cultural, and recreational sites since the previous assessment.
PDF Status and Trends of the Grand Canyon Population of Humpback Chub [More info]
The number of adult humpback chub--fish 4 years old and older and capable of reproduction--increased approximately 50 percent between 2001 and 2008.
PDF Possible effects of groundwater pumping on surface water in the Verde Valley, Arizona [More info]
We applied a groundwater model to simulate effects of groundwater pumping and artificial recharge on surface water in this area. Results show effects of pumping or recharge on streamflow.
PDF The effects of Glen Canyon Dam operations on early life stages of rainbow trout in the Colorado River [More info]
Complex interactions among hydrologic events initiated by people and the behaviors and characteristics of animal species (both native and introduced) lead to important scientific and management problems.
PDF Three Experimental High-Flow Releases from Glen Canyon Dam, Arizona-Effects on the Downstream Colorado River Ecosystem [More info]
Scientific issues we should consider when conduction high flow experiments to ameliorate the negative effects of dams on native river species and fluvial processes.
PDF Breccia-pipe uranium mining in northern Arizona; estimate of resources and assessment of historical effects [More info]
Estimates of uranium resources affected by land withdrawal, effects of previous breccia-pipe mining, water-chemistry data for streams and springs, and potential biological pathways of exposure to uranium and associated contaminants.
PDF An experiment to control nonnative fish in the Colorado River, Grand Canyon, Arizona [More info]
We removed non-native fish from a section of the river and the endangered native species humpback chub increased in abundance. But it is not yet clear that decreased competition explains the rebound in population.
PDF Monitoring and analysis of sand dune movement and growth on the Navajo Nation, southwestern United States [More info]
We combine long-term records from aerial photographs, detailed mapping using survey-grade GPS, and ground-based lidar with meteorological monitoring. Sand dune migration rates are currently about 35 meters per year.
PDF A dryland river transformed--the Little Colorado, 1936-2010 [More info]
We mapped substantial migration of the river channel between the City of Winslow and the Navajo Nation community of Leupp; in a human lifetime the river has moved more than a mile across its valley floor.
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