WYOMING FLOW REPORT

Last Updated: December 22, 2025

Wyoming's rivers and streams are experiencing varied flow conditions, with some waterways reporting decreased flow rates while others show signs of increased activity. Notably, the Firehole River near West Yellowstone, despite a recent increase in streamflow by 19.02 cubic feet per second (cfs), is flowing at 7.29% below its normal rate. Conversely, the Lamar River near Tower Falls Ranger Station has seen a significant 24-hour rise of 22.12 cfs, pushing its flow to 25.64% above normal. Water enthusiasts and communities along these rivers should be aware of these changes, as they may affect recreational activities and river ecosystems.

Particular attention should be given to the Greys River above the reservoir near Alpine, which has experienced a dramatic surge in flow, increasing by 96.76 cfs or 61.56% above normal, potentially impacting whitewater conditions and increasing the risk of flooding. Similarly, the Snake River below Flat Creek near Jackson is flowing at 10.03% above its usual rate, with an increase of 17.16 cfs, which could indicate burgeoning water levels that may affect the popular whitewater trails in the area. On the other end of the spectrum, the Little Wind River near Riverton and the North Platte River at the Wyoming-Nebraska State Line are experiencing substantial flow deficits of 47.2% and 49.39% below normal, respectively. These numbers suggest the possibility of flow droughts that could impact water supply and river health in the surrounding regions. River users and residents in these areas should stay informed about current conditions and be prepared for potential water-related impacts.

       



Wyoming has a semi-arid climate with an average annual precipitation of 14 inches. The state contains major surface flows such as the Green River, North Platte River, and the Snake River. The Wind River Range contains the headwaters of the Green and Snake Rivers. The state has many reservoirs and dams that are used for irrigation, flood control, and hydroelectric power generation. Snowpack in the mountains is a critical source of water for Wyoming's rivers, and snowmelt runoff typically peaks in May and June. The state is also affected by drought conditions, which can lead to reduced water availability and increased wildfire risk. Overall, Wyoming's hydrology is influenced by its specific geography, climate, and water management practices.


       

Winter Storm Warnings

December 22 2025

Residents across Wyoming are urged to exercise caution as numerous severe weather warnings are in effect today. The Powder River Basin in northeastern Wyoming faces an Air Quality Alert due to blowing dust from strong west southwest winds reaching 45 mph. Central Laramie County, North Snowy Range Foothills including Arlington and Elk Mountain along Interstate 80, and the South Laramie Range are under High Wind Warnings with gusts up to 65 mph, posing significant risks to transportation. A Red Flag Warning indicates rapid fire spread potential in fire weather zones 430 and 431, discouraging outdoor burning. Additionally, Winter Storm Warnings are issued for areas including the Salt River and Wyoming Ranges, Wind River Mountains, Absaroka Mountains, Yellowstone National Park, and the Teton and Gros Ventre Mountains, with heavy snowfall and strong winds making travel difficult and impacting the visibility significantly. Cities such as Cheyenne and Laramie could experience hazardous driving conditions, and outdoor activities are strongly discouraged until the warnings are lifted. Residents are advised to stay informed and prepare for potential emergencies.


Rafting & Kayaking

River Run Status Streamflow (CFS) Air Temp (F)
1st Gorge Lime
Class IV+ to V
39.99
Alpine Canyon (West Table to Sheep Gulch)
Class III- to III+
RUNNABLE 817 48
Astoria to West Table
Class I to II
RUNNABLE 817 48
Canyon
Class I
26 70
Cave Falls Run
Class III to III+
RUNNABLE 265 51
Granite Creek
Class II to III
TOO HIGH 66.6 46
Hoback Canyon
Class II to III+
38.43
Lower Greys (Squaw Creek to Bridge Campground)
Class III+ to V-
RUNNABLE 350 47
Narrows
Class III- to III+
RUNNABLE 890 44
Northgate Canyon
Class III- to III+
RUNNABLE 142 61
Upper Boxelder Canyon
Class V
RUNNABLE 215 74
Upper Greys (Lynx Creek to Little Greys)
Class II to IV+
RUNNABLE 350 47
Upper Greys (Murphy Creek Bridge to Lynx Creek Campground)
Class II to II+
RUNNABLE 350 47
Upper Greys (Murphy Creek Bridge to Lynx Creek Campground)
Class II to II+
RUNNABLE 350 47
Wedding of the waters
Class I
TOO HIGH 4350 89
       
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