Station Name: TUOLUMNE R AB EARLY INTAKE NR MATHER CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 2,493 feet

Nearest Address:
Preston Falls Trail
Groveland, CA 95321
Tuolumne County

GPS Coordinates: 37.87936848, -119.947126

Nearby Water Temperatures

Winter Storm Watch issued April 19 at 9:11AM PDT until April 22 at 5:00PM PDT by NWS Sacramento CA

Effective: Sun April 19, 2026, 9:11 AM
Expires: Mon April 20, 2026, 5:00 PM

* WHAT...Heavy snow possible above 5000 feet. Total snow accumulations of up to 12 to 18 inches, with up to 2 feet at the highest peaks. Minor accumulations of up to 2 inches possible down to 4500 feet. Southwest winds could gust as high as 50 mph. * WHERE...Sierra Nevada and southern Cascades above 5000 feet, including Highway 50, Interstate 80 and Lassen National Park. * WHEN...From late Monday night through Wednesday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday and Wednesday commutes. * ADDITIONAL DETAILS...Snow levels initially 6000 to 7000 feet Monday night, lowering to 5500 to 6500 feet Tuesday, and down to 4500 to 5500 feet Wednesday. Heaviest snowfall expected Tuesday afternoon and evening.

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

Winter Storm Watch issued April 20 at 1:50AM PDT until April 22 at 5:00PM PDT by NWS Hanford CA

Effective: Mon April 20, 2026, 1:50 AM
Expires: Mon April 20, 2026, 10:15 AM

* WHAT...Heavy snow possible. Total snow accumulations 3 to 5 inches above 7,000 feet, with 12 to 18 inches possible at the highest elevations of the Sierra Nevada. Winds could gust as high as 75 mph along the Sierra crest. * WHERE...Kaiser to Rodgers Ridge, Kings Canyon NP, Sequoia NP, Upper San Joaquin River, and Yosemite NP outside of the valley. * WHEN...From late tonight through Wednesday afternoon. * 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. Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage.

Monitor the latest forecasts for updates on this situation. 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 Warning issued April 20 at 9:10AM PDT until April 22 at 5:00PM PDT by NWS Hanford CA

Effective: Mon April 20, 2026, 9:10 AM
Expires: Mon April 20, 2026, 6:00 PM

* WHAT...Heavy snow possible. Total snow accumulations 3 to 5 inches above 7,000 feet, with 12 to 18 inches possible at the highest elevations of the Sierra Nevada. Winds could gust as high as 75 mph along the Sierra crest. * WHERE...Kaiser to Rodgers Ridge, Kings Canyon NP, Sequoia NP, Upper San Joaquin River, and Yosemite NP outside of the valley. * WHEN...From 2 AM Tuesday to 5 PM PDT Wednesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

Winter Storm Warning issued April 20 at 8:56AM PDT until April 22 at 5:00PM PDT by NWS Sacramento CA

Effective: Mon April 20, 2026, 8:56 AM
Expires: Mon April 20, 2026, 5:00 PM

* WHAT...Heavy snow likely above 5000 feet. Total snow accumulations of up to 12 to 18 inches, with up to 2 feet at the highest peaks. Minor accumulations of up to 2 inches possible down to 4500 feet. Southwest winds could gust as high as 50 mph. * WHERE...Sierra Nevada and southern Cascades above 5000 feet, including Highway 50, Interstate 80 and Lassen National Park. * WHEN...From 2 AM Tuesday to 5 PM PDT Wednesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday and Wednesday commutes. * ADDITIONAL DETAILS...Snow levels initially 6000 to 7000 feet tonight, lowering to 5500 to 6500 feet Tuesday, and down to 4500 to 5500 feet Wednesday. Heaviest snowfall expected Tuesday afternoon and evening with snowfall rates of 1 to 2 inches per hour.

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