Current conditions of LAKE OR RESERVOIR WATER SURFACE ELEVATION ABOVE NGVD 1929 and RESERVOIR STORAGE are available. What happened to the Hetch Hetchy level? Should be fixed at some point. If we reach 100% after the current rains and then it stops raining for the season, then our percentage will start going down. A small portion of the citys water comes from local reservoirs. Echoing the sentiments of famed naturalist John Muir, members say the glacially-carved Hetch Hetchy Valley that the reservoir sits in is comparable in grandeur to Yosemite Valley and should not be flooded. Wapama Falls Trail | Yosemite National Park | Hikespeak.com What happened to the Hetch Hetchy level? Share sensitive information only on official, secure websites. SFPUC announces Hetch Hetchy reservoir at less than 65 percent capacity But tearing down O'Shaughnessy Dam in order to restore Hetch Hetchy Valley would be a disaster. In addition, San Francisco receives approximately one-tenth of its power from hydroelectricity generated by the gravity-driven flow from the Hetch Hetchy Reservoir. In 2021, the SFPUC and the Modesto and Turlock Irrigation Districts launched a proactive pilot program with the U.S. I will take a look and see if there are other important reservoirs missing and may add them in the future. Lake ShastaLevel before the storm on Oct. 22: 882.57 feetLevel after the storm on Nov. 1: 885.47 feetTotal rise: 2.9 feet, Storage before the storm: 970,859 acre-feetStorage after the storm: 1,001,879 acre-feetTotal storage increase: 31,020 acre-feet, Lake OrovilleLevel before the storm: 630.80 feetLevel after the storm: 661.20 feetTotal rise: 30.4 feet, Storage before the storm: 799,638 acre-feetStorage after the storm: 982,263 acre-feetTotal storage increase: 182,625 acre-feet, Hetch HetchyLevel before the storm: 3,729.68 feetLevel after the storm: 3,750.99 feetTotal rise: 21.31 feet, Storage before the storm: 221,500 acre-feetStorage after the storm: 257,800 acre-feetTotal storage increase: 36,300 acre-feet, Trinity LakeLevel before the storm: 2,209.55 feetLevel after the storm: 2,213.22 feetTotal rise: 3.67 feet, Storage before the storm: 648,675 acre-feetStorage after the storm: 672,930 acre-feetTotal storage increase: 24,255 acre-feet, Folsom LakeLevel before the storm: 370.28 feetLevel after the storm: 390.33 feetTotal rise: 20.05 feet, Storage before the storm: 214,225 acre-feetStorage after the storm: 318,577 acre-feetTotal storage increase: 104,352 acre-feet, New Melones LakeLevel before the storm: 916.28 feetLevel after the storm: 917.09 feetTotal rise: 0.81 feet, Storage before the storm: 822,619 acre-feetStorage after the storm: 827,786 acre-feetTotal storage increase: 5,167 acre-feet, Don PedroLevel before the storm: 723.96 feetLevel after the storm: 727.41 feetTotal rise: 3.45 feet, Storage before the storm: 970,226 acre-feetStorage after the storm: 995,836 acre-feetTotal storage increase: 25,610 acre-feet, McClureLevel before the storm: 663.70 feetLevel after the storm: 672.27 feetTotal rise: 8.4 feet, Storage before the storm: 180,900 acre-feetStorage after the storm: 198,467 acre-feetTotal storage increase: 17,210 acre-feet. It allowed the water over the spillway to move too fast creating a vacuum between the water and the concrete that pulled the concrete sections out of the spillway. San Francisco operates three medium-sized hydro-electric power plants in the Tuolumne River watershed Kirkwood, Moccasin, and Holm. Restore Hetch Hetchy. Share sensitive information only on official, secure websites. Id love to see how much water is being / has been released from these reservoirs. She has been with SFGATE for more than 10 years. All Rights Reserved. Its great seeing all the reservoirs in California at or near historical averages. Trinity Lake, with a capacity of 2,447,650 acre-feet, had the smallest increase, from 29% in December to 30% in January. and maybe another vertical axis to the right of that with reservoir capacity. We own and operate the Hetch Hetchy Regional Water System which serves 2.7 million customers. Especially for small ones it is hard to identify them and click on them. . Map shows stunning improvement in California drought Just a wistful thought, it would be really cool to graph the water release statistics. by the Raker Act. At the moment, I am not interested in the debate. The name Hetch Hetchy is derived from a Sierra Miwok Monitoring location 11277500 is associated with a LAKE, RESERVOIR, IMPOUNDMENT in TUOLUMNE COUNTY, CALIFORNIA. Great Job on this site! Amid Drought, Century-Old Fight Over Hetch Hetchy Reservoir Simmers On According to the San Francisco Public Utilities Commission, Hetch Wife of missing Bay Area radio host says Jeffrey Vandergrift will not Sen. Dianne Feinstein is hospitalized in San Francisco with shingles, California extends deadline to file 2022 income taxes to match IRS decision, Going to Tahoe this weekend? required on whether to demolish OShaughnessy Dam. That cant be right. generates electricity for the city). Greetings from Mount Laurel New Jersey. Current conditions of LAKE OR RESERVOIR WATER SURFACE ELEVATION ABOVE NAVD 1988, LAKE OR RESERVOIR WATER SURFACE ELEVATION ABOVE NGVD 1929, and RESERVOIR STORAGE are available. Awesome work!! A 1 week change would be interesting to show on each. At times, nearly 90% of the flow of the Tuolumne River is piped off by the SFPUC and other water agencies in the region. Secure .gov websites use HTTPS For the class we based all our designs on the USACE spillway design manual. At the height of the recent drought, they still had at least four years in storage. And for the years they were hoarding water, the salmon-based ecosystem suffered.. But it has flooded nine miles of a glacier-carved valley and blocks access to the Grand Canyon of the Tuolumne and other nearby areas. Although Hetch Hetchy Reservoir is the most well-known, it stores less than 25% of the system's water. How can I match up other monitoring locations similar to the ones on this Interactive Dashboard? Occasionally the source water will shift to local reservoirs during routine maintenance to the conveyance system. While it may seem that Decembers production could get us through the rest of the season, Rizzardo explains that in hydrology, you need consistent water shed to keep soils happy. He fears that without more precipitation this season, well enter our third very dry year. As the system aged, especially in an era of heightened safety awareness following the Loma Prieta Earthquake in 1989 and drought in the 1990s, it became evident that the system required a complete overhaul. Meant this comment for the integrated snowpack and reservoir view. Emissions must be offset by dedicated conservation programs or renewable energy generation such as wind or solar. As of Feb. 1, the systems total water storage was just over 1.3 million acre-feet, or about 92% of capacity. Also, do they provide inflows and outflows for locations? California drought: Charts show where reservoir levels stand after a dry January, Track water shortages and restrictions across Bay Area. For the higher elevations, more of their water comes directly from snowmelt. 2151 River Plaza Drive, Suite 205 After record snowfall in December was followed by a dry January, there are renewed concerns of drought. proposition that would have funded an $8 million study on how Similar to the water supply issues discussed above, the amount of power replacement is small in a statewide context less than of 1% of the renewable power supply being developed this decade alone. Hetch Hetchy water travels 160 miles via gravity from Yosemite to the San Francisco Bay Area. Hetch Hetchy | Hetch Hetchy Dam & Reservoir History | Yosemite.com 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. After the reservoirs The north (side of the reservoir) usually has two waterfalls going at the best of times, but youll see up and down the canyon walls, if you look close, you count there are about 12 waterfalls running now, said Steve Ritchie, the SFPUCs assistant general manager of water enterprise, during a recent drought report to the agencys governing board. Stay up-to-date with breaking news and upcoming events. I was thinking that it would be interesting to compare inflows and outflows. She was previously an engagement reporter. System for more than 60 percent of their drinking water. The overall storage is said to have dropped by 57.4 to 56.4 (or 302 kaf). It is on the graph. As of 5pm on 1/18, the data appears correct (~58k acre feet), but an hour ago it was reading off the chart (3X above what they are allowed to store right now). The SFPUC has consistently stated that voluntary agreements are the best path forward for the Bay-Delta, as the voluntary agreement strikes the right balance between environmental stewardship and water reliability. https://cdec.water.ca.gov/dynamicapp/QueryDaily?s=SHA Instructions: Getting There. 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. So on Jan 10 were at 82% of the average for Jan 10. 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. Meanwhile, the group Restore Hetch Hetchy is urging the SFPUC to abandon Hetch Hetchy Reservoir. Hetch Hetchy is the only reservoir above its average storage of 63%, and is 82% full. 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. 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. Thanks for taking the time to do that. the map graph doesnt include berryessa. Water System | SFPUC Lock One of the most impressive was Hetch Hetchy, which provides drinking water to 2.6 million people in San Francisco and other Bay Area communities. the issue, including those under Franklin Delano Roosevelt, Francisco Bay Area. best to drain the valley. Water data back to 1930 are available online. Ronald Reagan and George W. Bush. Thank you for a beautiful job. The San Francisco Public Utilities Commission is involved in on-going negotiations with the State on a voluntary agreement for implementation of the Bay-Delta Plan, which calls for large increases in water releases on the tributaries to the San Joaquin River, a major tributary to the Bay-Delta. Next feature request: wire in aquifer level data! Californias snowpack slips below average after dismally dry January, renewing concerns about drought, Busting water limits wont cost you in Marin County: Penalties canceled as rain fills reservoirs, California snowpack hits highest level this century for March.
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