![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/horizontal-mendenhall.jpg\")
<\/figure>\nAnother severe flood arrived last month, and local scientists fully expect these aquatic disasters to return annually for decades to come. <\/p>\n
That grim reality has forced Juneau to confront a complex, harrowing problem that communities around the world are increasingly facing: How do you adequately prepare for a natural disaster when you know with absolute certainty that it will come back year after year?<\/p>\n
A Community on the Front Lines of Climate Change<\/h2>\n
Juneau is slowly finding an answer through a combination of grassroots resilience and advanced technology. Scientists and local municipal officials are putting increasingly sophisticated flood forecasts directly into the hands of ordinary residents. An online dashboard, rolled out in 2025, translates complex glacier and hydrology data into accessible information that families can use to decide when it is time to protect their belongings, prepare their properties for rising water, or evacuate their homes entirely.<\/p>\n
These detailed forecasts are fundamentally changing how Juneau responds to the perennial threat by providing local officials and thousands of people living inside the designated flood zone with crucial extra time to act before the frigid water arrives. The innovative approach could offer valuable lessons far beyond the borders of Alaska as communities elsewhere contend with severe floods, intensifying hurricanes, and other climate-driven disasters that strike repeatedly.<\/p>\n
Juneau sits uniquely nestled amid the steep mountains and vast wilderness that define much of southeast Alaska. Although it serves as the state capital and is home to roughly 32,000 residents, the city is accessible only by air or sea, creating a profound sense of isolation. Lowrey\u2019s family has deep, enduring roots in this rugged landscape. He recounted his harrowing story while standing directly beneath the hide of a brown bear that his grandfather had shot decades ago. Still, the sudden flood deeply traumatized his household, and his daughter still tears up whenever she thinks about that terrifying night. <\/p>\n \u201cWe didn\u2019t know anything,\u201d Lowrey said. \u201cWe didn\u2019t understand the nature of the basin. We thought it was a 100-year flood.\u201d<\/p>\n They quickly and painfully learned otherwise. Each summer, the high-altitude basin beside the Mendenhall Glacier fills rapidly with a mixture of glacial meltwater and heavy seasonal rain. The massive glacier acts as a temporary natural dam until enough water accumulates to lift the ice and trigger a massive torrent rushing downstream toward populated areas. In 2023, one of those sudden outbursts inundated roughly two dozen homes, sweeping an entire house directly into the rushing river and causing millions of dollars in structural damage. Just a year later, another severe flood damaged nearly 300 homes across the valley.<\/p>\n Glacial outburst floods are not entirely unique to Juneau; they occur with varying frequency in Iceland, the European Alps, the Himalayas, and other mountainous regions around the world that feature retreating glaciers. In Alaska\u2019s capital, however, residential neighborhoods sit directly in the direct path of the surging water, leaving thousands of local residents continuously exposed to the recurring threat.<\/p>\n Walking through the Mendenhall Valley today reveals the psychological and physical toll of the recurring disasters. \u201cFor Sale\u201d signs dot the neighborhood, but it has firmly become a buyer\u2019s market inside the hazard zone, with few outsiders willing to take the risk. Those trapped within it have had little choice but to adapt to the annual floods through sheer ingenuity and grit. Some homeowners have dug protective moats around their properties. Others have undertaken the massive expense of jacking up their houses several feet above the ground. Meanwhile, the city has constructed roughly six miles of temporary and permanent barriers between the Mendenhall River and vulnerable residential areas. <\/p>\n Amid the ongoing uncertainty, the newly developed flood dashboard has become an indispensable source of comfort and preparation. Mark Miller, a 75-year-old Juneau resident, checks the online tool every single day, anxiously waiting for the warning he knows is inevitably coming. <\/p>\n \u201cIt\u2019s pretty much on my mind constantly,\u201d he admitted.<\/p>\n Two years ago, the ominous sound of water pouring heavily into the crawl space beneath his house jolted Miller awake in the middle of the night. When he ventured out into his garage and opened the door, a thick wall of gray slush and water surged violently toward him. <\/p>\n By the time the water finally receded, 16 inches of stagnant water filled his garage, and thick mud and silt streaked the interior walls. Putting everything right took seven long months of grueling labor and cost $35,000 out of pocket. Tears still well up in his eyes at the memory of the ordeal. Now, he prepares for each impending flood season by placing heavy sandbags on both sides of his exterior doors to hold them firmly in place against the immense pressure of the rising water. He turns to the digital dashboard to understand what happened upstream and what is coming down the river next. <\/p>\n \u201cIt can accurately predict the height of glacial floods within hours, which is pretty amazing,\u201d he said.<\/p>\n Last year alone, more than 15,000 people accessed the dashboard for real-time updates on the water levels. In addition to dynamic flood maps and precise forecasts, the platform offers an interactive, easy-to-understand explanation of how the basin formed and the exact mechanics behind how glacial outburst floods occur. <\/p>\n It was through this digital tool that Miller finally learned the complex science behind the water that had invaded his home. <\/p>\n The Mendenhall Glacier peeks out majestically behind verdant mountains in the summertime, presenting a vast block of ancient ice streaked with brilliant shades of blue and gray that has long drawn tourists and scientists alike to Alaska\u2019s capital. The basin right beside the glacier is known locally as Suicide Basin. As water accumulates inside it from rain and accelerated melting, the immense hydrostatic pressure can literally lift the expansive edge of the ice, creating a subterranean drain that sends a destructive torrent rushing toward the Mendenhall River. During a particularly large outburst flood, the basin can release upward of 15 billion gallons of water\u2014enough to fill roughly 22,000 Olympic-size swimming pools.<\/p>\n The Mendenhall Valley first experienced this phenomenon in 2011, but at the time, scientists were entirely baffled as to why it happened. Researchers hopped into a helicopter to investigate from the air and discovered that water in the basin behind the glacier was suddenly and rapidly leaking out. <\/p>\n Seeking a reliable way to communicate critical warnings directly with affected residents, researchers at the University of Alaska Southeast and the Alaska Climate Adaptation Science Center collaborated closely with municipal officials to develop the dashboard. To ensure maximum reach, they worked alongside community members to distribute informative flyers and refrigerator magnets featuring QR codes that directed people straight to the live web tool.<\/p>\n Eran Hood, one of the environmental scientists who helped develop the forecasting tool, sees a much broader, highly valuable lesson in Juneau\u2019s hard-fought experience. <\/p>\n \u201cYou can do the same thing with hurricanes and storm surges,\u201d Hood said. \u201cYou could do the same thing with floods on rivers like the Mississippi.\u201d The ultimate goal, he emphasized, is to \u201cfind the best way to provide people with information that gives them the power to make decisions. That to me is the biggest lesson from this.\u201d<\/p>\n The precise flood data and advanced forecasts are also actively shaping the city\u2019s long-term infrastructure response. In 2024, municipal officials began analyzing the data to determine the most strategic locations to build miles of temporary and semi-permanent walls along the Mendenhall River to shield residential properties from future deluges.<\/p>\n On a rainy July afternoon, Nate Rumsey, the deputy director of engineering and public works for the city, stood looking up at towering stacks of army-green, dirt-filled barriers lining the riverbank to protect residents from an expected deluge that ultimately arrived on August 13. <\/p>\n Another severe flood, Rumsey warned, \u201ccould put the viability of our community at risk.\u201d<\/p>\n The defensive structures, known widely as Hesco barriers, snake through the town, running directly behind the local public library and an elementary school and passing perilously close to residential homes, sometimes coming within mere inches of living room windows. The fabric-lined wire-mesh baskets, which are heavily packed with dense sand and gravel, connect together securely like giant Lego bricks and are stacked two, three, or four high. Rumsey spent months coordinating with the U.S. Army Corps of Engineers to carefully map out and oversee their complex installation. <\/p>\n The online dashboard proved vital in helping homeowners\u2014who watched nervously as soldiers carried heavy barriers directly into their backyards\u2014understand the severe threat they faced and the rationale behind the city\u2019s aggressive defense strategy, Rumsey noted. Residents could easily use the digital tool to visualize how high the floodwaters might rise on their specific property without the barriers in place, helping them grasp what the heavy fortifications were explicitly designed to prevent.<\/p>\n The dashboard has fundamentally transformed how everyday residents perceive and interact with the natural landscape towering over them. <\/p>\n Alyssa Fischer never gave much thought to the massive glacier looming above her house until the terrifying morning she woke up at 2 a.m. to discover that her neighborhood street had abruptly turned into a raging river. <\/p>\n As the icy water poured aggressively into her garage and swept her front porch away into the current, the 33-year-old single mother instinctively decided it was time to evacuate. She grabbed her eight-year-old daughter and four-year-old son, carrying them through knee-deep, freezing water while shouting frantically at the top of her lungs to wake her neighbors. As the water level continued to rise above the wheels of her red pickup truck, she managed to place her beloved pet duck, quail, and goose safely into the vehicle’s bed. <\/p>\n Like so many resilient residents throughout Juneau, Fischer now speaks fluently in the language of the glaciologists and hydrologists studying the ice high above her home. She casually discusses how unexpected rainfall can dramatically alter a flood\u2019s timeline and how many cubic feet of rushing water could spell disaster for her family and neighbors. Throughout the peak flood season, she checks the dashboard on an hourly basis.<\/p>\n \u201cBefore it impacted my life, it was like, \u2018Oh, that\u2019s interesting,\u2019\u201d Fischer said. \u201cNow, I want to know what\u2019s happening.\u201d <\/p>\n That hard-earned knowledge now shapes every major decision she makes regarding her home, the safety of her children, and her family’s long-term future. <\/p>\n \u201cIt\u2019s your life,\u201d she said. \u201cIt\u2019s your money and your investment, and understanding what\u2019s actually happening in the world around you and how it\u2019s going to affect you is everything.\u201d<\/p>\n Armed with a battery-powered radio, bright flashlights, and the real-time data streaming from the dashboard on her phone, she waits patiently for the next inevitable flood.<\/p>\n","protected":false},"excerpt":{"rendered":" Two years ago, John Lowrey woke to the terrifying roar of water violently surging into his home. A 65-year-old retiree and proud father of five, Lowrey rushed toward his basement just in time to watch a three-foot wall of water slam through the door, instantly tearing it entirely off its heavy hinges. Water crashed uncontrollably […]<\/p>\n","protected":false},"author":6,"featured_media":1339,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1820,1817,1438,1407,825,1437,1821,1816,1818,1819,725,1439],"class_list":["post-1340","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-annual","tag-calling","tag-climate-change","tag-comes","tag-conservation","tag-environment","tag-flood","tag-glacier","tag-juneau","tag-learned","tag-live","tag-sustainability"],"_links":{"self":[{"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/posts\/1340","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/tcjsj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1340"}],"version-history":[{"count":0,"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/posts\/1340\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tcjsj.com\/index.php?rest_route=\/wp\/v2\/media\/1339"}],"wp:attachment":[{"href":"https:\/\/tcjsj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tcjsj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tcjsj.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/juneau-valley.jpg\")
<\/figure>\nAdapting to an Uncertain Future<\/h2>\n
![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/john-lowrey.jpg\")
<\/figure>\n![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/alaska-floodwall.jpg\")
<\/figure>\nLessons for a Warming World<\/h2>\n
![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/flood-info-qr-code.jpg\")
<\/figure>\n![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2025\/05\/alaska-salmon-glacier-mining.jpg\")
<\/figure>\n![\"Juneau](\"https:\/\/grist.org\/wp-content\/uploads\/2026\/09\/house-sandbags.jpg\")
<\/figure>\n