Station Name: Firehole River at Old Faithful, YNP
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 7,372 feet

Nearest Address:
Mallard Lake Trail
Yellowstone National Park, WY 82190
Teton County

GPS Coordinates: 44.4593333, -110.8222722

Nearby Water Temperatures

Winter Weather Advisory issued January 6 at 4:55AM MST until January 7 at 5:00PM MST by NWS Riverton WY

Effective: Tue January 6, 2026, 4:55 AM
Expires: Tue January 6, 2026, 5:00 PM

* WHAT...Snow expected. Total snow accumulations of 6 to 12 inches. Locally higher amounts of 12 to 18 inches in the higher elevations with amounts nearing 2 feet in the Tetons. Winds may gust as high as 45 mph at times. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Wednesday. * IMPACTS...Travel could be very difficult at times, including over Teton and Togwotee Passes. * ADDITIONAL DETAILS...Snowfall rates will vary through Wednesday. Snow will be lighter today before picking back up late this evening.

Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .

Winter Weather Advisory issued January 6 at 4:55AM MST until January 7 at 5:00PM MST by NWS Riverton WY

Effective: Tue January 6, 2026, 4:55 AM
Expires: Tue January 6, 2026, 5:00 PM

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches with amounts of 1 to 2 inches nearby Mammoth. Locally higher amounts of 10 to 16 inches near the South Entrance and up to 2 feet in southwestern portions of the park. Winds may gust as high as 50 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 PM MST Wednesday. * IMPACTS...Travel could be very difficult, especially in the backcountry.

Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .

Winter Weather Advisory issued January 6 at 12:34PM MST until January 7 at 5:00PM MST by NWS Riverton WY

Effective: Tue January 6, 2026, 12:34 PM
Expires: Wed January 7, 2026, 7:00 AM

* WHAT...Snow expected. Additional snow accumulations of 1 to 2 inches nearby Mammoth and higher accumulations of 10 to 14 inches near the South Entrance. Up to 2 feet of additional snow accumulations in southwest portions of Yellowstone. Widespread wind gusts of 25 to 35 mph, with higher elevations gusting up to 50 mph. * WHERE...Yellowstone National Park. * WHEN...Until 5 PM MST Wednesday. * IMPACTS...Travel could be very difficult, especially in the backcountry. * ADDITIONAL DETAILS...Snowfall will vary between light to moderate intensity through Wednesday evening. The most likely period of moderate snowfall will be Tuesday evening through Wednesday morning.

Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .

Winter Weather Advisory issued January 6 at 12:34PM MST until January 7 at 5:00PM MST by NWS Riverton WY

Effective: Tue January 6, 2026, 12:34 PM
Expires: Wed January 7, 2026, 7:00 AM

* WHAT...Snow expected. Additional snow accumulations of 6 to 11 inches. Additional accumulations of 12 to 16 inches are expected in the higher elevations with amounts nearing 2 feet in the Tetons. Widespread wind gusts of 25 to 35 mph, with higher elevations gusting around 45 mph. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Wednesday. * IMPACTS...Travel could be very difficult at times, especially over Teton and Togwotee Passes. * ADDITIONAL DETAILS...Snowfall will vary between light to moderate intensity through Wednesday evening. The most likely period of moderate snowfall will be Tuesday evening through Wednesday morning.

Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .

Winter Weather Advisory issued January 6 at 1:22AM MST until January 6 at 5:00PM MST by NWS Pocatello ID

Effective: Tue January 6, 2026, 1:22 AM
Expires: Tue January 6, 2026, 4:00 PM

* WHAT...Snow. Additional snow accumulations up to 5 inches. * WHERE...Centennial Mountains - Island Park. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning and evening commutes.

Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.

Winter Weather Advisory issued January 6 at 12:31PM MST until January 7 at 11:00PM MST by NWS Pocatello ID

Effective: Tue January 6, 2026, 12:31 PM
Expires: Wed January 7, 2026, 5:15 AM

* WHAT...Snow expected. Total snow accumulations between 6 and 12 inches above 6 thousand feet and 4 to 8 inches below 6 thousand feet. Winds gusting as high as 40 mph. * WHERE...Sawtooth/Stanley Basin, Sun Valley Region, Big Hole Mountains, and Centennial Mountains - Island Park. * WHEN...From 5 PM this afternoon to 11 PM MST Wednesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Wednesday morning and evening commutes.

Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.