Station Name: TUOLUMNE R NR HETCH HETCHY CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 3,484 feet

Nearest Address:
Hetch Hetchy Road
Groveland, CA 95321
Tuolumne County

GPS Coordinates: 37.93742147, -119.7982326

Nearby Water Temperatures

Winter Storm Watch issued April 8 at 2:50PM PDT until April 12 at 11:00PM PDT by NWS Hanford CA

Effective: Wed April 8, 2026, 2:50 PM
Expires: Thu April 9, 2026, 3:00 AM

* WHAT...Heavy snow impacting travel and outdoor activities possible. Winds could gust as high as 50 mph. * WHERE...Sierra Nevada above 7000 feet. * WHEN...From Friday afternoon through Sunday evening. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Visibilities may drop below 1/4 mile due to falling and blowing snow. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Whiteout conditions are possible and may make travel treacherous and potentially life-threatening.

Persons are urged to stay indoors until conditions improve. If you must go outside, dress in layers. Several layers of clothes will keep you warmer than a single heavy coat. Cover exposed skin to reduce your risk of frostbite or hypothermia. Gloves, a scarf, and a hat will keep you from losing your body heat. Persons should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Leave plenty of room between you and the motorist ahead of you, and allow extra time to reach your destination. Avoid sudden braking or acceleration, and be especially cautious on hills or when making turns. Make sure your car is winterized and in good working order.

Winter Storm Watch issued April 8 at 12:19PM PDT until April 12 at 11:00PM PDT by NWS Sacramento CA

Effective: Wed April 8, 2026, 12:19 PM
Expires: Thu April 9, 2026, 4:30 PM

* WHAT...Heavy snow possible. Total snow accumulations 1 to 2 feet possible above 4500 feet, with up to 3 to 4 feet at the highest peaks. Light snowfall accumulations up to 2 to 4 inches as low as 4000 feet. Winds could gust as high as 45 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park above 4500 feet. * WHEN...From Friday evening through Sunday evening. Heaviest snow expected late Saturday morning through midday Sunday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Friday evening commute and weekend mountain travel. * ADDITIONAL DETAILS...Snow levels remain above pass levels through Friday afternoon, dropping to around 6000-7000 ft late Friday-Saturday, then lowering to around 4000-4500 ft late Saturday into Sunday.

Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.