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 23 at 11:34AM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Tue December 23, 2025, 11:34 AM
Expires: Wed December 24, 2025, 4:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, the Sacramento Valley, northern San Joaquin Valley, Delta region, Sierra Nevada and adjacent foothills, and Coastal Range. * 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 the week of Christmas. 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.

Winter Storm Warning issued December 23 at 11:32AM PST until December 26 at 10:00PM PST by NWS Sacramento CA

Effective: Tue December 23, 2025, 11:32 AM
Expires: Wed December 24, 2025, 4:15 PM

* WHAT...Heavy snow expected. 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...From 10 PM this evening to 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 accumulations will remain near or above pass level through Tuesday, then drop to around 4500 to 5500 feet during the day Wednesday 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.

High Wind Warning issued December 24 at 9:24AM PST until December 25 at 4:00PM PST by NWS Sacramento CA

Effective: Wed December 24, 2025, 9:24 AM
Expires: Thu December 25, 2025, 4:00 PM

* WHAT...South winds 25 to 35 mph with gusts up to 60 mph expected. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Strong winds and saturated soils could blow down trees and power lines resulting in widespread power outages. Strong winds will cause impacts to loose and unsecured items, including temporary structures and holiday decorations. Difficult travel conditions are expected, especially for high profile vehicles. * ADDITIONAL DETAILS...Lull in activity through today, with strong wind gusts expected tonight into Thursday.

Watch for falling debris and tree limbs. Use caution if you must drive. Take time now to prepare for potential power outages.

Flood Watch issued December 24 at 7:29AM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 7:29 AM
Expires: Wed December 24, 2025, 4:00 PM

* 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 24 at 7:29AM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 7:29 AM
Expires: Wed December 24, 2025, 4:00 PM

* WHAT...Heavy snow. Additional snow accumulations up to 103 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 Wednesday 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.

Special Weather Statement issued December 24 at 4:03PM PST by NWS Sacramento CA

Effective: Wed December 24, 2025, 4:03 PM
Expires: Wed December 24, 2025, 4:45 PM

At 403 PM PST, Doppler radar was tracking a cluster of strong thunderstorms along a line extending from near Newcastle to La Riviera. Movement was north at 35 mph. HAZARD...Winds in excess of 30 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Sacramento, Roseville, Citrus Heights, Rocklin, Auburn, Fair Oaks, Carmichael, Rancho Cordova, Lincoln, Loomis, La Riviera, Newcastle, Foothill Farms, Granite Bay, North Highlands, Antelope, Orangevale, Rosemont, Gold River, and Rio Linda.

If outdoors, consider seeking shelter inside a building. Torrential rainfall is also occurring with these storms and may lead to localized flooding. Do not drive your vehicle through flooded roadways.

Flood Watch issued December 24 at 3:37PM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 3:37 PM
Expires: Wed December 24, 2025, 11:45 PM

* 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 24 at 3:37PM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 3:37 PM
Expires: Thu December 25, 2025, 12:00 AM

* WHAT...Heavy snow. Additional snow accumulations up to 91 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 Wednesday evening and Thursday morning 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 December 24 at 1:22PM PST until December 26 at 10:00PM PST by NWS Sacramento CA

Effective: Wed December 24, 2025, 1:22 PM
Expires: Thu December 25, 2025, 4:00 PM

* WHAT...Heavy snow expected. 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.

Flood Watch issued December 24 at 1:19PM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Wed December 24, 2025, 1:19 PM
Expires: Thu December 25, 2025, 4:00 PM

A series of warm atmospheric rivers will bring moderate to heavy rain to the Valley, foothills, and mountains the week of Christmas. The prolonged period of rain will bring the risk of flooding to the Sacramento Valley, northern San Joaquin Valley, northern Sierra Nevada and adjacent foothills, as well as the Coastal Range. * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, Carquinez Strait and Delta, Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, Northern San Joaquin Valley, and Shasta Lake Area / Northern Shasta County . * 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 the week of Christmas. 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.

Wind Advisory issued December 24 at 7:30AM PST until December 25 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 7:30 AM
Expires: Wed December 24, 2025, 4:00 PM

* WHAT...Southeast winds 10 to 20 mph with gusts up to 40 mph. * WHERE...Kern River Valley, Los Banos - Dos Palos, Mariposa Madera Foothills, Mariposa-Madera Lower Sierra, Merced - Madera - Mendota, Planada - Le Grand - Snelling, and Yosemite Valley. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

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

Flood Watch issued December 24 at 7:29AM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 7:29 AM
Expires: Wed December 24, 2025, 4:00 PM

* 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.

Flood Watch issued December 24 at 3:37PM PST until December 26 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 3:37 PM
Expires: Wed December 24, 2025, 11:45 PM

* 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.

Wind Advisory issued December 24 at 3:37PM PST until December 25 at 4:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 3:37 PM
Expires: Wed December 24, 2025, 11:45 PM

* WHAT...Southeast winds 10 to 20 mph with gusts up to 40 mph. * WHERE...Kern River Valley, Los Banos - Dos Palos, Mariposa Madera Foothills, Mariposa-Madera Lower Sierra, Merced - Madera - Mendota, Planada - Le Grand - Snelling, and Yosemite Valley. * WHEN...Until 4 PM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

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

Winter Storm Warning issued December 24 at 7:29AM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 7:29 AM
Expires: Wed December 24, 2025, 4:00 PM

* WHAT...Heavy snow. Additional snow accumulations up to 98 inches. Winds gusting as high as 50 mph. * WHERE...A portion of central California. * 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 Wednesday morning and evening commutes. Gusty winds could bring down tree branches.

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 December 24 at 3:37PM PST until December 26 at 10:00PM PST by NWS Hanford CA

Effective: Wed December 24, 2025, 3:37 PM
Expires: Thu December 25, 2025, 12:00 AM

* WHAT...Heavy snow. Additional snow accumulations up to 85 inches. Winds gusting as high as 55 mph. * WHERE...A portion of central California. * 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 Wednesday evening and Thursday morning 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.