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

Flood Watch issued December 25 at 4:29PM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Thu December 25, 2025, 4:29 PM
Expires: Fri December 26, 2025, 1:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Mariposa-Madera Lower Sierra, San Joaquin River Canyon, Upper San Joaquin River, Yosemite NP outside of the valley and Yosemite Valley. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Winter Storm Warning issued December 25 at 11:50AM PST until December 26 at 10:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 11:50 AM
Expires: Fri December 26, 2025, 3:00 PM

* WHAT...Heavy snow expected. total accumulations up to a foot between 4500 to 5500 feet. 4 to 8 feet, with locally higher amounts above 5500 feet. Wind gusts up to 60 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...Until 10 PM PST Friday. * IMPACTS...Dangerous travel conditions with chain controls and road closures. Localized tree damage, power outages, and low visibility due to the combination of heavy wet snow and strong winds. * ADDITIONAL DETAILS...Snow levels will be around 4500 to 5500 feet today through Friday. Snowfall rates of 1 to 2 inches per hour at times.

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

Wind Advisory issued December 25 at 11:45AM PST until December 26 at 10:00AM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 11:45 AM
Expires: Fri December 26, 2025, 10:00 AM

* WHAT...South winds 15 to 25 mph with gusts up to 45 mph. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley. * WHEN...Until 10 AM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects and holiday decorations. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...High Wind Warning was downgraded to the Wind Advisory. Breezy southerly winds are expected, with the strongest this evening and overnight.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.

Flood Watch issued December 25 at 7:45PM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 7:45 PM
Expires: Fri December 26, 2025, 4:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, Sacramento Valley, northern San Joaquin Valley, Delta region, and the foothills of the Sierra Nevada. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff will result in rises along area rivers, creeks, streams. Small streams and creeks may rise out of their banks. Flooding may occur in low-lying, poor drainage, and urban areas. Mudslides and rockslides may occur in mountain and foothill areas. * ADDITIONAL DETAILS... - Periods of moderate to heavy rain are forecast into Friday. Debris flows are not expected over recent burn scars in northern California, but do anticipate enhanced runoff in/below scars. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Flood Advisory issued December 25 at 6:59PM PST until December 26 at 6:00PM PST by NWS Sacramento CA

Effective: Thu December 25, 2025, 6:59 PM
Expires: Fri December 26, 2025, 6:00 PM

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...Portions of central and northern California, including the following counties, in central California, Placer. In northern California, Amador, Butte, Calaveras, El Dorado, Nevada, Sacramento, San Joaquin, Sierra, Solano, Stanislaus, Sutter, Tuolumne, Yolo and Yuba. * WHEN...Until 600 PM PST Friday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 656 PM PST, Doppler radar indicated moderate to heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Periods of moderate to heavy rainfall is forecast to occur in the advisory area into Friday, resulting in flooding. - Some locations that will experience flooding include... Sacramento, Stockton, Modesto, Elk Grove, Roseville, Citrus Heights, Tracy, Folsom, Turlock, Rocklin, Ceres, Galt, Oakdale, Auburn, Grass Valley, Marysville, Placerville, Sonora, Jackson and Paloma. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Flood Watch issued December 26 at 12:53AM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Fri December 26, 2025, 12:53 AM
Expires: Fri December 26, 2025, 9:30 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Mariposa-Madera Lower Sierra, San Joaquin River Canyon, Upper San Joaquin River, Yosemite NP outside of the valley and Yosemite Valley. * WHEN...Through this afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Winter Storm Warning issued December 25 at 11:41PM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Thu December 25, 2025, 11:41 PM
Expires: Fri December 26, 2025, 8:30 AM

* WHAT...Heavy snow. Additional snow accumulations between 1 and 30 inches. Winds gusting as high as 60 mph. * WHERE...Yosemite NP outside of the valley. * WHEN...Until 10 PM PST Friday. * IMPACTS...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 expected and will make travel treacherous and potentially life-threatening. Travel could be very difficult to impossible. The hazardous conditions could impact the Friday 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.

Flood Watch issued December 25 at 4:29PM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Thu December 25, 2025, 4:29 PM
Expires: Fri December 26, 2025, 1:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Bakersfield, Buena Vista, Buttonwillow - Lost Hills - I5, Caruthers - San Joaquin - Selma, Coalinga - Avenal, Delano-Wasco-Shafter, Frazier Mountain Communities, Fresno-Clovis, Fresno-Tulare Foothills, Fresno-Tulare Lower Sierra, Grant Grove Area, Grapevine, Hanford - Corcoran - Lemoore, Indian Wells Valley, Kaiser to Rodgers Ridge, Kern River Valley, Kings Canyon NP, Los Banos - Dos Palos, Mariposa Madera Foothills, Merced - Madera - Mendota, Mojave Desert, Mojave Desert Slopes, Piute Walker Basin, Planada - Le Grand - Snelling, Sequoia NP, South End San Joaquin Valley, South End Sierra Foothills, South End of the Lower Sierra, South End of the Upper Sierra, Southeast San Joaquin Valley, Tehachapi, Visalia - Porterville - Reedley, West Side Mountains South of 198, West Side Mountains north of 198 and West Side of Fresno and Kings Counties. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Flash Flood Warning issued December 26 at 4:21AM PST until December 26 at 7:30AM PST by NWS Hanford CA

Effective: Fri December 26, 2025, 4:21 AM
Expires: Fri December 26, 2025, 7:30 AM

FFWHNX The National Weather Service in Hanford has issued a * Flash Flood Warning for... Central Madera County in central California... South Central Mariposa County in central California... * Until 730 AM PST. * At 421 AM PST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.2 and 0.5 inches of rain have fallen. The expected rainfall rate is 0.5 to 0.75 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Bootjack, Yosemite Lakes, Metcalf Gap and Jerseydale.

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

Flood Watch issued December 26 at 12:53AM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Fri December 26, 2025, 12:53 AM
Expires: Fri December 26, 2025, 9:30 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central California, including the following areas, Bakersfield, Buena Vista, Buttonwillow - Lost Hills - I5, Caruthers - San Joaquin - Selma, Coalinga - Avenal, Delano-Wasco-Shafter, Frazier Mountain Communities, Fresno-Clovis, Fresno-Tulare Foothills, Fresno-Tulare Lower Sierra, Grant Grove Area, Grapevine, Hanford - Corcoran - Lemoore, Indian Wells Valley, Kaiser to Rodgers Ridge, Kern River Valley, Kings Canyon NP, Los Banos - Dos Palos, Mariposa Madera Foothills, Merced - Madera - Mendota, Mojave Desert, Mojave Desert Slopes, Piute Walker Basin, Planada - Le Grand - Snelling, Sequoia NP, South End San Joaquin Valley, South End Sierra Foothills, South End of the Lower Sierra, South End of the Upper Sierra, Southeast San Joaquin Valley, Tehachapi, Visalia - Porterville - Reedley, West Side Mountains South of 198, West Side Mountains north of 198 and West Side of Fresno and Kings Counties. * WHEN...Through this afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Winter Storm Warning issued December 25 at 11:41PM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Thu December 25, 2025, 11:41 PM
Expires: Fri December 26, 2025, 8:30 AM

* WHAT...Heavy snow. Additional snow accumulations up to 28 inches. Winds gusting as high as 55 mph. * WHERE...Sierra Nevada south of Yosemite NP for elevations above 7,000 feet. * WHEN...Until 10 PM PST Friday. * IMPACTS...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 expected and will make travel treacherous and potentially life-threatening. Travel could be very difficult to impossible. The hazardous conditions could impact the Friday 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.