WYOMING FLOW REPORT

Last Updated: December 21, 2025

Wyoming's rivers are currently experiencing a variety of streamflow conditions, with several waterways reporting flow rates below normal for the season, which could impact river-based activities. The Firehole River near West Yellowstone, for example, is running at 205 cubic feet per second (cfs), which is 21.61% below the norm, suggesting potential flow drought conditions. Similarly, the iconic Yellowstone River at Yellowstone Lake Outlet is also lower than usual at 407 cfs, 17.86% under its average. Water enthusiasts, including anglers and kayakers, should note that popular whitewater trails and fishing spots may be less vigorous, potentially exposing more hazards in the river. In contrast, the Lamar River near Tower Falls Ranger Station has seen a notable increase to 276 cfs, 25.64% above normal, indicating a surge that could signal the onset of early spring runoff or localized precipitation events.

Particularly noteworthy is the Greys River, which has experienced a dramatic rise in streamflow, now at 425 cfs, representing a significant 61.56% above the typical flow and perhaps indicating potential for flooding conditions near Alpine and surrounding watersheds. Meanwhile, the Bear River below Smiths Fork and North Platte River at the Wyoming-Nebraska State Line both show significant decreases in flow rates, at 42.23% and 49.39% below normal, respectively, potentially affecting water supply and stream health. On the other hand, the Green River near Green River, WY, is slightly above average at 7.27%, which could be beneficial for local ecosystems. River enthusiasts should remain alert for the variable conditions across Wyoming's rivers and plan accordingly for their recreational activities, taking note of the streamflow changes and gage heights that could impact accessibility and safety for communities and wildlife dependent on these crucial waterways.

       



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 21 2025

Residents across Wyoming are urged to exercise extreme caution as multiple Winter Storm Warnings are in effect until 5 PM MST Monday. Heavy snow with accumulations reaching up to 40 inches, particularly in the Teton, Gros Ventre, Salt River, Wyoming Ranges, Absaroka Mountains, and Yellowstone National Park, is expected to severely disrupt travel. Wind gusts could reach 70 mph in areas like South Pass/Red Canyon, which, along with the snow, could lead to near-zero visibility and treacherous driving conditions. Additionally, High Wind Warnings are issued for central Carbon County and southeast Wyoming, with gusts potentially reaching 75 mph, posing significant risks, especially to high profile vehicles. Residents in affected areas, including commuters in and near these mountain ranges, should prepare for potential road closures and avoid travel unless absolutely necessary.


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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