Two decades of climate change-induced drought and rising temperatures, combined with ever-growing demand, have put the entire water system — and the flora and fauna and more than 40 million people that rely on it — into serious trouble. Now local, state and federal water managers are being forced to reckon with a frightening reality: the incredible shrinking Colorado River system. - High Country News

Scientists have known for decades that climate change makes wildfires more common, larger, and more intense. Now an international team of scientists has demonstrated a new connection between fires and global warming. Using data from Landsat satellites, they discovered that wildfires in the western United States have been spreading to higher elevations due to warmer and drier conditions that are clearly linked to climate change.  Historically, forest fires have been rare in high-elevation areas—at least 8,200 feet (2,500 meters) above sea level. But when McGill University scientist Mohammad Reza Alizadeh and colleagues studied fires that occurred in the West between 1984 and 2017, they found blazes moving to higher ground at a rate of 25 feet (7.6 meters) per year.  Fires are now burning higher up on hillsides and mountainsides because areas that used to be too wet to burn are now drier due to warmer temperatures and earlier snowmelt.  - NASA

Years of recreational shooting left hazardous levels of lead in the soil of a parcel of land in the White Tank Mountains, and the site west of Phoenix will remain closed for three more years for cleanup.  The area was shuttered to recreational shooting after a pregnant woman was killed by a stray bullet more than three years ago.  The multimillion-dollar remediation effort comes as Buckeye aims to lease the land from the federal Bureau of Land Management for a park. It's an area that public safety officials previously describe as "a mess" because of the number of people shooting at all hours, in all directions. - AZ Central

Managers of some Arizona golf courses are fighting a plan that would cut water use at a time when the state is being forced to confront shrinking water supplies.  A group representing golf courses has been pushing back against a proposal by state officials that would reduce overall water use on courses, instead offering a plan that would entail less conservation.  Opposition to the state’s proposal for golf courses has emerged over the past several months, aired in sometimes-tense virtual meetings where representatives of courses have said they understand the need to conserve but are concerned the proposed reductions in water allotments would damage their businesses. - AZ Central

On Feb. 22, 2021, Lake Powell was 127.24 feet below 'Full Pool' or, by content, about 38% full. Based on water level elevations, these measurements do not account for years of sediment (clay, silt, and sand) accumulation—the millions of metric tons on the bottom. Geologist James L. Powell said, "The Colorado delivers enough sediment to Lake Powell to fill 1,400 ship cargo containers each day." In other words, Lake Powell is shrinking toward the middle from top and bottom. The lake is down over 30 feet from one year ago, and estimates suggest it could drop another 50 feet by 2026. - Lake Powell Chronicle

Declining levels at the second-largest reservoir in the U.S. have spurred officials in Colorado, Utah, Wyoming and New Mexico to search for ways to prop it up.  Lake Powell on the Colorado River is dropping rapidly amid one of the southwestern watershed’s driest years on record. It’s currently forecast to be at 29% of capacity by the end of September – the lowest level since the reservoir first started filling in 1963. Its sister reservoir downstream on the Colorado River, Lake Mead, also is approaching a record low this year. - Cronkite News

Mexico is experiencing one of its most widespread and intense droughts in decades. Nearly 85 percent of the country is facing drought conditions as of April 15, 2021. Large reservoirs across the country are standing at exceptionally low levels, straining water resources for drinking, farming, and irrigation. The mayor of Mexico City called it the worst drought in 30 years for the city, which is home to about 9 million people.  This drought doesn't stop at the Arizona borders . The entire SW USA and Mexico are affected.  - NASA

Interstate water disputes are as American as apple pie. States often think a neighboring state is using more than its fair share from a river, lake or aquifer that crosses borders.  Currently the U.S. Supreme Court has on its docket a case between Texas, New Mexico and Colorado and another between Mississippi and Tennessee. The court has already ruled this term on cases pitting Texas against New Mexico and Florida against Georgia.  Climate stresses are raising the stakes. Rising temperatures require farmers to use more water to grow the same amount of crops. Prolonged and severe droughts decrease available supplies. Wildfires are burning hotter and lasting longer. Fires bake the soil, reducing forests’ ability to hold water, increasing evaporation from barren land and compromising water supplies. - HCN

Wracked by drought, climate change and overuse, a key reservoir on the Colorado River could sink to historically low levels later this year, new US government projections show, potentially triggering significant water cutbacks in some states as early as next year.  The projections released by the US Bureau of Reclamation show that Lake Mead, largest reservoir in the US and a vital water supply to millions across the Southwest, could fall later this year to its lowest levels since it was filled in the 1930s. - CNN

In Phoenix, two cities are emerging: one is water-rich, the other water-poor  Every two weeks, Dawn Upton floods her lawn. She treks into her back yard, twists open two valves big as dinner plates, and within minutes is ankle-deep in water.  “You have to have irrigation boots, girl,” she says during a video tour of her property in Mesa, a suburb of Phoenix, Arizona. She flips her camera to reveal green grass, then tilts her phone skyward at four towering palm trees. As she walks, she pans across pecan, pomegranate, and citrus trees – lemon, orange, a grapefruit sapling. A tortoise, between 80 and 100lb, lumbers toward her, chewing. “There’s Simba,” Upton says. “Hey buddy! What is that, Simba? You can’t eat it.” She pats him affectionately on the head. - Guardian

State officials are putting farmers in south-central Arizona on notice that the continuing drought means a “substantial cut" in deliveries of Colorado River water is expected next year.  A statement issued Friday by the state Department of Water Resources and the Central Arizona Project said an expected shortage declaration “will result in a substantial cut to Arizona’s share of the river, with reductions falling largely to central Arizona agricultural users." - AZ Family