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Carlee McClellan, senior hydrologist for the Navajo Nation Department of Water Resources. Credit: Rebecca McClellan

Water is a crucial resource for the Navajo Nation, which spans some of the driest states in the U.S. – Arizona, New Mexico and Utah. Sparse infrastructure leaves more than 40 percent of Navajo households without running water.

That makes Carlee McClellan's job critical. Born and raised Navajo, McClellan is the senior hydrologist for the Navajo Nation Department of Water Resources. He's working with NASA's Earth Applied Sciences Program to include NASA Earth observations in the Nation's water decision making. Called the Drought Severity Evaluation Tool, this user-friendly web application combines many datasets such as precipitation and temperature from NASA satellites with drought metrics from models and ground-based rain measurements.

It's a high-tech, space-based way to monitor the Nation's resources for drinking water and irrigation – and McClellan says working with NASA data is just one of the many surprises he's had in his career. In fact, when he was growing up, he did not expect a career in science at all.

A water tank on the Navajo Nation near Grey Mountain, Arizona. Credit: Carlee McClellan

McClellan's mother is a teacher's aide and artist who received a high school education, while his father, a cowboy and rancher, left school after 6th grade. "They raised me with the older, traditional upbringing of Navajo lifestyle – my mom still doesn't have running water to her home," explained McClellan. "We hauled water, we went into the mountains to cut firewood, and we took care of the animals. So, when people asked me what I wanted to be when I grew up, I said 'I don't know, a rancher?'"

McClellan's older sister was the first one to suggest college. Though he struggled in high school, McClellan took an inquisitive interest in chemistry. He often helped his maternal grandmother in the garden, chopping wood, hauling water – and peppering her with questions she couldn't answer.

"She only spoke Navajo," McClellan recalled, "and I'd ask her, 'How can we take clay, turn it into pottery, and it doesn't turn back to mud?'" When his grandmother couldn't answer, he turned to his high school chemistry teacher for answers. She suggested he could gain some much-needed extra credit by researching his own questions and writing reports on what he found.

"It is monumental to have an organization like NASA work with us to diversify and augment the water tools we have at our disposal.” — Carl McClellan, Navajo Nation Department of Water Resources

That same teacher was impressed by the work McClellan put in, and it marked a turning point. Her husband, an organic chemistry professor at Northern Arizona University in Flagstaff, offered him a research position over the summer. For McClellan, this confirmed his love of science – and he stayed to pursue a degree in chemistry. He dropped out in his last year of school to find work in Tucson, but "after a few years of odd jobs, I knew it was time to go back to school," explained McClellan. First, he started with community college, then transferred his hours to the University of Arizona to complete his bachelor's degree in chemistry.

A rock formation on the Navajo Nation. Credit: NASA/Amber McCullum

McClellan then worked for various environmental consulting firms and laboratories, focusing on water quality and hazardous waste. But in the summer of 2015, he was ready to leave the laboratory for the field. That's when he found an opening with the Navajo Nation, which was wrapping up a project with NASA DEVELOP. DEVELOP, part of the NASA Earth Applied Sciences Capacity Building program area, works to build up the ability of partner organizations to use Earth observations to address environmental and public policy issues.

The Drought Severity Evaluation Tool showing the six-month Standardized Precipitation Index displayed as a map across the Navajo Nation, with warmer colors representing drought conditions. These maps can be used to make mitigation decisions, especially in drought emergencies. Credit: NASA/Amber McCullum

"The [DEVELOP] project was short-term by design, but the resulting web application was written in a coding language that was difficult to use. I explained to NASA that we needed something more user-friendly – and they immediately came up with a potential solution," McClellan said.

Attendees of the Navajo Nation remote sensing and drought workshop in Flagstaff, Arizona, April 2019. Credit: NASA/Amber McCullum

The DEVELOP work then transitioned into an effort supported by NASA's Western Water Applications Office (WWAO). The team partnered with the Desert Research Institute (DRI) to expand the project into a customized tool, as a spin-off of the popular Climate Engine to directly meet the community's needs. Climate Engine uses Google's Earth Engine to process, on-demand, satellite and climate data via a web browser. McClellan and colleagues plan to finalize the Drought Severity Evaluation Tool in the summer of 2020.

McClellan and Amber McCullum, NASA lead scientist on the Navajo Nation Drought project, attending the NASA Capacity Building Event at the American Geophysical Union Fall meeting in San Francisco, December 2019. Credit: NASA/Amber McCullum

Looking forward, McClellan thinks another important target for measurement is snowpack, particularly in the Chuska Mountains, which on average contain nearly 80% of the Nation's snowpack. The ability to better understand this vital resource will be useful for water management, agriculture and cultural activities.

"Making what used to be hard easy," McClellan said. He and Amber McCullum, McClellan's project partner at NASA, at a Navajo Nation remote sensing and drought workshop in Flagstaff, Arizona in April 2019. Members of the Navajo Nation Departments of Water Resources, Agriculture, Land Management, Forestry, and Fish and Wildlife attended, along with participants from the Desert Research Institute, U.S. Department of Agriculture and the Southwest Climate Adaptation Center. Credit: Desert Research Institute/Justin Huntington

"A lot of this work had not yet been done – what we're doing with the Drought Severity Evaluation Tool is pioneering," McClellan said. Bringing the unique perspective we get from space and using it on Earth has the potential to revolutionize McClellan's job as the Nation's senior hydrologist. While the Nation began monitoring surface water in the 1980s, there are only 85 rain gauges to cover the entire reservation which, with an area covering 17,544,500 acres, is larger than West Virginia. "The Navajo Nation has been pretty underserved in monitoring surface-water needs," he said.

That's one of many reasons McClellan is proud to be doing this work for the communities he grew up with.

"I'm full-blooded Navajo – I grew up on the Navajo Reservation," McClellan said. "It is monumental to be able to have an organization like NASA and others work with us to diversify and augment the water tools we have at our disposal. For us this is a great blessing."

More information:

Seeking Relief From Drought – The Navajo Turn to NASA

NASA’s Western Water Applications Office (WWAO)

This story is part of our Space for U.S. collection. To learn how NASA data are being used in your state, please visit nasa.gov/spaceforus.

Note: Edited on May 26, 2021 to update a link to the Drought Severity Evaluation Tool.

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This story is part of Space for U.S., a collection of stories showing how NASA data is being used across the country. Space for U.S. is where the power of NASA’s Earth observations come to life through state-by-state stories featuring communities like yours—solving our country’s biggest challenges with innovative technology, groundbreaking insights, and extraordinary collaboration.