WYOMING FLOW REPORT

Last Updated: December 31, 2025

Wyoming's river report indicates a mix of below-normal and above-normal streamflows across the state's diverse river systems. The Firehole River near West Yellowstone exhibits a slight decrease in streamflow, with a current measure at 221 cubic feet per second (cfs), about 14.31% below the seasonal norm. In contrast, the Lamar River near Tower Falls Ranger Station boasts a significant increase in flow, at 276 cfs, which is 25.64% above normal, likely capturing the attention of whitewater enthusiasts. Likewise, the North Fork Shoshone River at Wapiti shows an exceptional surge, streaming at 527 cfs, a dramatic 133.19% increase from what is typical. The Wind River basin presents variability, with the Wind River at Riverton experiencing a notable decrease in flow, down 27.08% from the norm. The Snake River near Jackson Lake at Flagg Ranch, a popular site for water activities, is currently flowing at 501 cfs, standing at 44.09% above what is usual, indicating conditions that may be of interest for river recreation.

Areas around notable watersheds, such as the Bighorn River at Kane and the Green River near La Barge, are seeing streamflows close to their seasonal averages, with the Bighorn River at Kane flowing at 1180 cfs. However, the Shoshone River near Lovell is experiencing a decrease, with flows at 460 cfs, 15.98% below normal. The South Fork Shoshone River, important for its contribution to the larger Shoshone River system, is also below normal by 35.72%. Of particular note is Dinwoody Creek, with an extraordinary increase peaking at 248.03% above normal, though with a relatively low absolute flow of 120 cfs. Cities such as Riverton, near the Little Wind River, and Dubois, by the Wind River, may want to monitor these water bodies for potential impacts due to the abnormal streamflow trends. Recreational river users and residents in these areas should stay informed on the latest river conditions, as the observed fluctuations could affect fishing, boating, and local water resources.

       



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 31 2025

Residents of Wyoming, especially those in the North Snowy Range Foothills including Arlington and Elk Mountain along Interstate 80, and those in the South Laramie Range including the Interstate 80 Summit between Cheyenne and Laramie, and the Bordeaux area along Interstate 25 between Chugwater and Wheatland, should brace for potentially hazardous conditions. A High Wind Warning is in effect until 9 AM MST with west winds of 25 to 35 mph and gusts up to 65 mph expected, posing a risk mainly to transportation due to strong cross winds. A High Wind Watch remains until 11 AM MST, with similar conditions threatening the safety of lightweight or high-profile vehicles. Extreme caution is advised when traveling in these areas.


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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