Maintaining this variety of sources is an important component of our near and long-term water supply management strategy. California Reservoir Levels - Dashboard and visualization showing current water levels in California reservoirs . function reloadiframes(){ I see many of the local canals flowing with lots of water. The Bay Area's main reservoir is up 21 feet. BAWSCA Board of Directors Meeting, March 16, 2023, 6:30 PM. "In contrast, the Shasta Lake drainage had only a couple of stations in excess of 10 inches whereas most received less. The soaking was welcome in a drought-plagued state with a diminishing water supply. She was born and raised in the Bay Area and got her start in news at the Daily Californian newspaper at UC Berkeley where she majored in English literature. The surplus has renewed concerns about San Francisco stockpiling water at the expense of rivers and the fish and wildlife that live there. This system encompasses more than 1,250 miles of distribution pipelines, as well as 12 in-City reservoirs and eight water tanks with a total storage capacity of approximately 413 million gallons. scenic mountain valley in a national park. As of Feb. 1, the systems total water storage was just over 1.3 million acre-feet, or about 92% of capacity. The Bay Area portion of the System includes water collection, treatment, and transmission facilities from the Alameda East Portal to the wholesale service area and terminal reservoirs in San Francisco. From the main road, it's about a 20- to 25-minute drive to the parking area. The snowpack acts as a natural reservoir and slowly releases water.. Hetch Hetchy is only one of nine reservoirs in the San Francisco Public Utility Commissions water system. **new combined California reservoir and snowpack visualizer**, made a bar graph showing the overall level of water in the major California reservoirs, the California Department of Water Resources (DWR) Data Exchange Center. . United States. But the growing water reserves dont please everyone. The reservoir was at 75 percent capacity as of May 5, totaling 269,963 acre-feet of water (an acre-foot is nearly 326,000 gallons). River. The Hetch Hetchy Reservoir in Yosemite delivers water to 2.6 million Bay Area residents every day. Ill pass it along to friends. Great resource! Hetch Hetchy Reservoir in Yosemite National Park is seen in 2022. They are releasing water into the canals. setTimeout(function (){ The adopted Plan addresses water quality issues affecting the ecosystem and fisheries of the Bay-Delta system. The average for this time of year is approximately 4,659.57ft, plus or minus 39ft. The upcountry portion of the System begins with Hetch Hetchy Reservoir in Yosemite National Park. their water supply would cost hundreds of millions of dollars at Why isnt Lake Sonoma included? If you look at the inflow data on the major reservoirs, its pretty flat. Thats enough to supply the citys service area for perhaps seven years. For perspective, water demand across the SFPUC's service area of 2.7 million people was about 205,000 acre-feet last fiscal year. Lake Almanor isnt controlled by DWR for flood/supply. Spring snowmelt runs down the Tuolumne River and fills Hetch Hetchy, the largest reservoir in our water system. HETCH HETCHY RES A HETCH HETCHY CA. For example, the average storage level for Feb. 7 is usually 65% of capacity for Trinity Dam, but currently its at 31%. Long-term values for reservoir inflows use maximum number of complete water years in record. System for more than 60 percent of their drinking water. Its fluctuating between ~107% and ~20% from one hour to the next (reading 107.6 atm). I wonder why it doesnt work for you. The OShaughnessy Dam i s 300 feet tall only medium-sized by todays standards. The construction of the Hetch Hetchy Railroad took place from 1915 to 1918. 1 covering up to $875 million and much of the rest coming from federal loans to water suppliers. This would allow us to see important, but noise-level reservoirs like hetch hetchy. In response to the Bay-Delta Plan, the SFPUC and the Modesto and Turlock Irrigation Districts have proposed the Tuolumne River Voluntary Agreement, a combination of flow and non-flow measures sufficient to improve all life-stages of native fish populations in the lower Tuolumne River. San Franciscos water system, which includes Hetchy Hetchy, is expected to fill this winter for the first time since 2019. The windfall of water is welcome news for households and businesses in San Francisco, which use less water on average compared to the rest of the state but nonetheless have faced calls to cut back since 2021 because of water shortages. Its water supply Hetch Hetchy Reservoir, in the Sierra Nevada is 80% full, . At times, nearly 90% of the flow of the Tuolumne River is piped off by the SFPUC and other water agencies in the region. Born in Seoul, Yoohyun began her career in Arizona, where she worked for two of the state's largest newspapers covering various beats, including criminal justice and education. The water treatment facilities are Tesla Ultraviolet Treatment Facility, disinfecting the Hetch Hetchy supply; Sunol Valley Water Treatment Plant, treating the water from the Calaveras and San Antonio supply as well as the stored Hetch Hetchy supply; and Harry Tracy Water Treatment Plant, treating the water from the Crystal Springs and San Andreas supply. Python is used to extract the data from this page hourly and wrangle the data in to a clean format. Is the Stanley Quencher tumbler worth its TikTok hype? Wonderful site. Only improvement I would suggest is an improvement of the display of the smaller reservoirs so the names are readable. Located within the boundaries of Yosemite National Park, the reservoir saw a sizable 21.31-foot bump in its water level and gained 36,300 acre-feet, according to Tuesday data from the U.S. Geological Survey. One of the big challenges in water management is controling the release. hetch hetchy reservoir level percentage Rivers and Streams Streams draining into the Peninsula Watershed within the project area are relatively small, steep, and in a 2021-11-17. City officials have touted their efforts to help salmon, for example by timing water releases to assist with migration and restoring breeding grounds. This almost happened with the Orville Dam in 2017. Part of the lake is on the California side, but it has zero California water impact beyond the immediate Tahoe residents. The problem is that we have no idea of knowing ahead of time what kind of storms well have and how long theyll last, but the reservoir operators have to be super careful and extra cautious, so they periodically let the water flow out. Lots of possibilities, just curious. I second that request. The valley is administration attempted to allocate funds to study removing the Call 209-372-0200 for the latest road and weather conditions, Hetch Hetchy Road Daily Hours: 8 am to 5 pm It seems likely one of those two readings is wrong. a minimum, according to the San Francisco Public Utilities SFGATE took a look at reservoir levels three days after the Oct. 24 storm and below we take another look, examining water level rises and storage increases at a broader range of reservoirs roughly a week after the atmospheric river event. Sierra Club unsuccessfully fought the reservoirs establishment Thats up more than 400,000 acre-feet since early December, before the unrelenting series of atmospheric river storms blew through California between Christmas and mid-January. John Muir and the California snowpack hits highest level this century for March. The trail includes spectacular views of Tueeulala and Wapama Falls. The main goal of this visualization is to provide a quick overview of the status of the main reservoirs in the state and how they compare to historical levels. The name Hetch Hetchy is derived from a Sierra Miwok ", The difference in soil type in the two watersheds was likely another factor. This is of particular interest as the self-imposed restrictions deadline is approaching and the federal government may have to step in and mandate restrictions across the 7 states, including California. If we reach 100% after the current rains and then it stops raining for the season, then our percentage will start going down. Hetch Hetchy is the only reservoir above its average storage of 63%, and is 82% full. Jeff, the average changes daily as well. And the current water storage amounts are well below the historical averages for this time of year. Generation at Holm powerhouse below Cherry Lake would be less affected. Restore Hetch Hetchy intends to undo this Great American mistake, and return the valley to Yosemite National Park and all people. While forecasters can predict the likelihood of future rainfall over large areas, they cant pinpoint it to the degree needed to determine whether a particular watershed/reservoir will overflow and cause damage and loss of life. This is my first year watching the levels, so maybe Im missing something. . Having it here would be great! YTD values are from January 1 . Current conditions of LAKE OR RESERVOIR WATER SURFACE ELEVATION ABOVE NGVD 1929 and RESERVOIR STORAGE are available. Hetch Hetchy is only one of nine reservoirs in the San Francisco Public Utility Commission's water system. Francisco Public Utilities Commissions 26 wholesale customers Owned by the city of San Francisco, Hetch Hetchy Reservoir This is a very clear graph and I cannot imagine the hours you have put in while setting it up and doing the maintenance. A .gov website belongs to an official government organization in the This is wonderful information. Kellie has held many leadership roles for the Asian American Journalists Association, including most recently a board member for the San Francisco chapter. Similar findings are described in theUC Davis studyRe-Assembling Hetch HetchyandUS Bureau of Reclamation study. Yes, and why is Twitchell Dam also not listed? Winter weather conditions may cause road closures. Great Job on this site! The captured water is piped 150 miles to the Bay Area. Thanks for taking the time to do that. 2022 All Rights Reserved. And while one storm didn't come close to ending the drought, some reservoirs in Northern California, especially those that fell right in the path of the storm, saw significant gains. They also built a spillway that was too steep and did not install energy dissipators along the spillway. And more work is underway. Usually with warm ARs, you get a dramatic increase in inflow, which can fill even very large reservoirs relatively quickly, like Oroville in 2017. Its just small enough that the name doesnt appear as the bar is too thin. Local reservoir inflows have negative daily flow rates set to zero. According to the San Francisco Public Utilities Commission, Hetch Hetch Hetchy has generated controversy since it was first James Q. Martin / Restore Hetch Hetchy Show More Show Less 4 of 7 I also added the ability to select specific reservoirs to display on the graph and share a custom URL which will point those selected reservoirs (click on list button on top right of dashboard). The Department of Water Resources, which manages the state's water supply, said in a statement that there are several possible reasons for the difference in inflow amounts between the two reservoirs. in 2018. and its snowmelt-fed water supply, water from Hetch Hetchy Thank you! I would turn this graph, 90 counterclockwise, and start the capacity along the bottom axis from left to right, with the biggest reservoirs on the left and the smaller ones on the right. If you click on the list button in the top right of the dashboard, it will show a list of the reservoirs (in order of size from largest to smallest) and you can check which ones you would like to display. Upcountry and the Bay Area. San Francisco's water-bank in Don Pedro Reservoir, downstream on the Tuolumne River, holds twice as much water as Hetch Hetchy. Could the reason be that the water from Lake Alma or seems to be used for energy generation, and that there does not seem to be any agricultural or urban use? Gavin Newsom asked all California residents to voluntarily reduce use by 15% compared with use in 2019. The Hetch Hetchy Valley today with the dam seen in the lower right. In whats known as the Bay-Delta Plan, state water regulators are amid a years-long effort to negotiate a policy for how much water should be kept in rivers that flow to the Sacramento-San Joaquin River Delta to meet the needs of both people and wildlife. Current and Historical Visualization, https://cdec.water.ca.gov/dynamicapp/QueryDaily?s=HTH, https://cdec.water.ca.gov/dynamicapp/QueryDaily?s=SHA, https://engaging-data.com/ca-reservoir-level/, https://cdec.water.ca.gov/reportapp/javareports?name=RES, Visualizing Californias Water Storage Reservoirs and Snowpack, Interactive California Reservoir Levels Dashboard. Omar, Thanks! Park visitors walk across OShaughnessy Dam in Yosemite National Park on Sept. 1. Yoohyun Jung is the Deputy Data Editor for The San Francisco Chronicle. We own and operate the Hetch Hetchy Regional Water System which serves 2.7 million customers. The proportion of blue to brown will show how full it is, while the red line shows the historical level that reservoir is typically at for this date of the water year. Hi Keith, you could de-select the large reservoirs from the menu at the top right. Near the town of La Grange, the river exits the Sierra Nevada foothills and flows through a gently sloping alluvial valley that is incised into Pleistocene alluvial fans. Maybe bad data. Excellent graphic! Restore Hetch Hetchy. Folsom Lake is letting the water flow out. Hetch-Hetchy predicted to fill by end of the snowmelt period 2020-2021 Winter season continues to be dry 2019-2020 was dry, although key differences Feb. 2020 was unusually warm, which impacted snowfall levels and water demands; Feb 2021 was cooler, and hence snowfall level higher and water use lower Before joining the Chronicle, Alexander worked as a freelance writer and as a staff reporter for several media organizations, including The Fresno Bee and Bay Area News Group, writing about government, politics and the environment. These sources include surface water stored in reservoirs located in the Sierra Nevada, Alameda County and San Mateo County, and groundwater supplies stored in a deep aquifer located in San Francisco and San Mateo counties. Locked padlock They are draining it currently so that it can serve as that overflow if needed given how much rain is coming down and expected over the next week. He frequently writes about water, wildfire, climate and the American West. thanks. More about the Tuolumne River Voluntary Agreement can be found athttp://www.tuolumnerivermanagementplan.com. Lake Mendocino, which has a capacity of 122,400 acre feet, saw the biggest boost from 17% of storage capacity in December to 35% in January. "This was rare for October. BAWSCA agencies advocated for the capital improvement program that was adopted by the SFPUC in 2002, and are actively monitoring its implementation. Are they releasing water to relieve the pressure in anticipation of more water? The Mokolumne River, which originates in the high Sierra, provides more than 90 percent of the East Bay's water and the Owens Valley in the eastern Sierra serves as a key source of water for Los Angeles. Voters rejected a 2012 In 2016, a Tuolumne County Superior Court judge dismissed the Data and Tools It would be really interesting to visualize whether were able to replenish ground water this year after all the precipitation. Construction of the regional water system proceeded over the following 20 years, with water first delivered in 1934. Share sensitive information only on official, secure websites. Although Hetch Hetchy Reservoir is the most well-known, it stores less than 25% of the system's water. reservoir violates the California Constitution specifically the Hetch Hetchy Reservoir in Yosemite was 69 percent full on Tuesday, 150 percent of normal for this time of year. Arg. CHERRY LK NR HETCH HETCHY CA Important Legacy real-time page Monitoring location 11277200 is associated with a LAKE, RESERVOIR, IMPOUNDMENT in TUOLUMNE COUNTY, CALIFORNIA. Absolutely zero reason to be releasing this much water from these reservoirs. Charts from the California Department of Water Resources show conditions at key state reservoirs on Oct. 22 (left) and on Nov. 2 (right). A different story is unfolding at Hetch Hetchy reservoir in Yosemite National Park, where water is being released to conserve and restore wildlife. While constructed and owned by San Francisco, the water system was in fact planned to benefit the greater San Francisco Bay Area population. This is a marimekko (or mekko) graph which may take some time to understand if you arent used to seeing them. In another sign that Californias drought is easing, San Francisco captured more than a years worth of water in just one months time. Kurtis Alexander is an enterprise reporter for The San Francisco Chronicle, with a focus on natural resources and the environment. however, Ill update the code to include it soon. An official website of the United States government. I have to agree with many people here what a great job making such a clear graph of whats happening. Data have been checked by the reporting agency. Current conditions of LAKE OR RESERVOIR WATER SURFACE ELEVATION ABOVE NGVD 1929 and RESERVOIR STORAGE are available. The recent spate of storms lifted the statewide snowpack to 190% of average for the start of the month, and more snow is on the way. Take CA Highway 120 from the park toward Groveland. Privacy Policy | 2011-2021 San Francisco Public Utilities Commission. The amount stored is increasing, just not by a lot. Water data back to 1956 are available online. Next feature request: wire in aquifer level data! Impounded by OShaughnessy Dam, Hetch Hetchy Reservoir water passes through hydroelectric powerhouses before it enters the San Joaquin Pipelines, the Tesla Ultraviolet Treatment Facility, and the Coast Range Tunnel on its journey to the Bay Area. Is that a good thing? Especially for small ones it is hard to identify them and click on them. I think the problem is with the CDEC database (as the LakesOnline website also has had incorrectly high information).

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