Little rain has fallen in the region, which has been experiencing high temperatures in recent months-- a continuation of an atmospheric ridge that has been plaguing the Pacific Northwest with record-breaking temperatures.

The large school of fish may have been fooled by a single rain shower that coincided with high tide, making their way upstream in an attempt to spawn for the season, the researchers said.

The tens of thousands of fish eventually sucked up all of the oxygen in the low water levels of the creek. Once they were rendered immobile and began to die off, the ammonia left in the water exacerbated the mass death event.

More than 70% of the salmon had not had the opportunity to spawn before water levels in the creek dropped, Dennert tweeted on Oct. 4.

\"I would say it's pretty safe to say this is a consequence of climate change,\" Dennert said.

Lack of snow melt to replenish the Platt River

Stunning images out of Nebraska shed light into the harsh reality of the consequences of diminishing amounts of snow pack.

The Platte River in central Nebraska, which is fed by snow melt from the Rocky Mountains in Wyoming and Colorado that feed into Lake McConaughy, has not had a chance to replenish as less and less snow falls over the winter.

\"PHOTO:
Chris Machian/Omaha World-Herald via AP, FILE
PHOTO: A car heads south on the Highway 81 bridge over a mostly dry Platte River south of Columbus, Neb., July 28, 2022.
>

Photos of a portion of Interstate 90 near Kearney, Nebraska, show a completely dehydrated river bed under a bridge that was previously filled with river water.

More than a third of the Pratte River is in extreme or worse conditions, with precipitation outlooks for the fall forecast to be dry, the Drought Center tweeted on Monday.

The #PlatteRiver is almost entirely dry downstream of Kearney, NE. Almost all of Nebraska is in #drought with over a third in extreme or worse condition. #NEwx

Photos by @UNL photographer Craig Chandler. pic.twitter.com/OPalGR0K3I

— Drought Center (@DroughtCenter) October 17, 2022

Irrigation has depleted most of the reservoirs in the northeast and southwest Nebraska, which are both in extreme drought, KLKN, the ABC affiliate in Lincoln, Nebraska, reported.

Widespread areas around the state have been \"quite dry and quite warm\" since early July, causing water demand and usage for crops to increase dramatically, Brian Fuchs, climatologist for the National Drought Mitigation Center, told KLKN.

While it is not unusual for the river to go dry during the irrigation season, experts are monitoring the river downstream of Columbus as an indicator of the overall health of the river, Jason Farnsworth, executive director of the Platte River Recovery Implementation Program, told KLKN.

\"If down below the Loup River, you have no flow, that’s sort of a really big deal,\" Farnsworth said.

Supplies of drinking water continue to dwindle in the West

As the megadrought in the West persists, the reservoirs providing water to households and the vast agriculture industry are getting dangerously low.

Water supplies along the Colorado River and the two largest reservoirs in the country that it supplies -- Lake Mead and Lake Powell -- are continuing to recede.

Further west, reservoirs in California as drying up as well, Pablo Ortiz, climate and waters scientist at the Union of Concerned Scientists, told ABC News.

\"PHOTO:
David Mcnew/Getty Images, FILE
PHOTO: Lake Meads white bathtub ring reveals historic water level decline near Hoover Dam on Sept. 16, 2022 in Boulder City, Nevada.
>

Lake Oroville and Lake Shasta, the two biggest reservoirs in the state, are barely above 30% capacity, and every major reservoir in California except for one is below the historical average, according to the California Department of Water Resources.

In addition, more than 60% of monitored groundwater wells in California are below normal conditions, and more than 21% are currently experiencing historically low levels, Ortiz said. Workers who are drilling into groundwater wells have told Ortiz that groundwater levels in some regions have dropped up to 10 feet, Ortiz said.

\"This impacts hundreds of communities that depend on groundwater as their primary source of drinking water,\" as well as the agriculture industry, he said.

ABC News' Kenton Gewecke and Samantha Wnek contributed to this report.

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