These long-term projections help water managers plan for future shortages, which are increasingly likely in the Colorado River Basin, in part because of warmer temperatures brought on by global climate change. The water level in Lake Powell was at a record low when rain and snow began to fall across the Colorado River Basin in October, soaking dry soils ahead of the winter season. For five years after 2012, snow- and rainfall totals were generally low, as the region suffered through a persistent, long-term drought. Even in low emission climate scenarios (forecasts that are based on the assumption that future carbon dioxide emissions will increase relatively slowly), models predict precipitation may decline by 20-25 percent over most of California, southern Nevada, and Arizona by the end of this century. Last July, to protect the 3,525 buffer zone, Reclamation ordered emergency water releases from three reservoirs in the Upper Colorado River Basin. This was the lowest water levels have been since the lake was first constructed in the 1930s. The grim forecast comes as water officials race to bolster Lake Powell's water levels. Sunday, February 26, 2023 12:00:00 AM Level is 178.87 feet Both Moser and Lukas said that dry soil moisture conditions across the Colorado River Basin, which can sponge off valuable runoff before the water makes it into rivers and streams, wont be quite as bad as last year but will still be a negative factor. (For comparison, the 1991-2020 total water year average is 9.60 maf.) Lukas noted that the dry soil conditions are factored into the NOAA runoff predictions from the get-go so there shouldnt necessarily be any big surprises with that particular variable. google_ad_format = "160x600_as"; Gas Prices on Lake The reduction of releases from Lake Powell from 7.48 maf to 7.00 maf in water year 2022 resulted in a reduced release volume of 0.480 maf that normally would have been released from Glen Canyon Dam to Lake Mead as part of the 7.48 maf annual release volume, consistent with operations under the 2007 Interim Guidelines. @) .=] j Bvq2 4=B4[YCO@p/e`5[ #("A3?M|Cd(Jje(B_il:.\7m=.{CZ&&q5O}NOB6jGptUEN1Dh'6dW30oLqmt1W#F/qy<5aJ5
LuQmB(JD'4z`9q#v k[ T Under a Drought Contingency Plan adopted in 2019, approximately 500 thousand acre-feet (kaf) of water will come from Flaming Gorge Reservoir, located approximately 455 river miles upstream of Lake Powell. Federal and state water managers have watched the water level in Lake Powell closely this year. This is the big warning bell.. Along its route, the river passes through an elaborate water-management system designed to tame the yearly floods from spring snowmelt and to provide a reliable supply of water for residents as far away as California. Antelope Point Launch Ramp Bullfrog Main Launch Ramp Lake Powell, Printable Version The declines were first apparent in the side canyons feeding the reservoir which thinned and then shortened. On April 8, Reclamation announced it would likely keep more water in Lake Powell, reducing releases from the planned 7.5 million acre-feet to 7 million acre-feet, a move that could trigger emergency water cutbacks in Arizona, California and Nevada. We are 41% through the Water Year. Water levels in Lake Powell dropped to a new record low on Tuesday. The Colorado River cuts through dry land that was once covered by Lake Powell on September 7, 2022, near Hite, Utah. Combined with water withdrawals that many believe are not sustainable, the drought has caused a dramatic drop in Lake Powells water level. A powerful winter storm will enter AZ early Tuesday night with rain and snow showers increasing across the region after midnight. Were an initiative of theCenter for Environmental Journalismat the University of Colorado Boulder. As the forecast season progresses, In order to restore Lake Powell's levels, one expert said people must conserve water in the Colorado River's lower basin. google_ad_client = "pub-0146338466817273"; (Due to the angle of sunlight, this image may cause an optical illusion known as relief inversion.). Hourly releases during February 2023 will fluctuate from a low of approximately 5,797 cfs during the early morning hours to a high of 10,091 cfs during the afternoon and evening hours. Soil moisture conditions have improved over the last year across most of Colorados Western Slope, but thats not necessarily saying much because of how bad soil moisture conditions were heading into last years snowmelt runoff season, Moser said. Click for . Last Reading: 3522.33 on Feb 12, 2023. She reported that, as of March 16, 2022, Lake Powell was at an elevation of 3,524.83 feet (ft.) with storage of 5.916 million acre-feet (maf) or 24 percent of capacity. Newsweek reached out to the U.S. Geological Survey for comment. On April 8, Reclamation announced it would likely keep more water in Lake Powell, reducing releases from the planned 7.5 million acre-feet to 7 million acre-feet, a move that could trigger emergency water cutbacks in Arizona, California and Nevada. Water levels in Narrow Canyon had dropped enough to show canyon floor features not visible in earlier images. Lake Powells water levels plummeted in early 2005, according to the U.S. Department of the Interior Bureau of Reclamation. However, these responses can have a noticeable impact on the river downstream of Glen Canyon Dam. levels. " 9`SADP zg Ab``#@ 7
3
At the same time, power producers are gearing up to craft a fallback plan for extending hydropower production at Glen Canyon Dam if water levels continue to fall. Powell was last within 2" of this elevation on Feb 11, 2023 There are currently 1,757,155,460,140 gallons of water in Lake Powell! Though the 2022 forecast isnt expected to be finalized until later this month, water officials expect that more water will have to be released from Upper Basin storage reservoirs this summer because inflows into the lake from the drought-stressed Colorado River are expected to be well below average again, in the 60% to 80% range. In the image acquired on May 1, 2004, the reservoirs northwestern branch is isolated from the main reservoir; the shallow water upstream could not crest raised areas in the lakebed. The grim forecast comes as water officials race to bolster Lake Powells water levels. At the beginning of water year 2023, total system storage in the Colorado River Basin was 19.54 maf (33 percent of 58.48 maf total system capacity). By 2002, the lake level had dropped far enough that the exposed canyon walls created a pale outline around the lake. Based on current inflow forecasts, the current projected end of water year 2023 total Colorado Basin reservoir storage is approximately 20.93 maf (36 percent of total system capacity). At the beginning of the series in 1999, water levels in Lake Powell were relatively high, and the water was a clear, dark blue. These projections are critical for planning for an increasingly dry future in the Colorado River Basin, but a new paper from Utah State University says the model may still underestimate the risk. Click for Details, Current Snowpack Conditions for Upper Colorado Basin. The final NOAA forecast for the season predicts the amount of water to reach Lake Powell this year to be about 60% of average. water-data.com LakePowell Water Database . The water levels at Lake Powell have dropped around 100 feet in the last three years. If you have feedback on content, format, or publication frequency, please contact us. The northwestern side branch of Lake Powell remained cut off from the rest of the reservoir. Depending on the severity of the system emergency, the response from Glen Canyon Dam can be significant, within the full range of the operating capacity of the power plant for as long as is necessary to maintain balance in the transmission system. The forecast isnt great, said Kyle Whitaker, Colorado River Manager for the Northern Colorado Water Conservancy District, one of the largest diverters of water in the headwaters region of the river. Water Data for 20 days surrounding Feb 28, 2022. This level is actually .02 feet . The most recent data is from Monday, February 27th, 2023. SW Satellite Weather The sediment-filled Colorado River appeared green-brown. Some Arizona cities have implemented drought management plans to conserve water, but the area continues to use water at a rate that negates Lake Powell's recovery. "Its always good to plan for the worst, right? According to Jay Lund, vice director for the Center for Watershed Sciences and a professor at the University of California, the long-term average use in the lower Colorado River Basin exceeds the long-term flow of water, meaning the only solution is to "substantially reduce water use" in the basin. It took decades for Lake Powell to reach catastrophically low levels, and according to one expert . Antelope Point Marina on Feb. 3, 2022, in the Glen Canyon National Recreation Area near Page. Get the most up to date information on Lake Powell's water levels and the status of launch ramps from the Bureau of Reclamation, National Park Service, and more with the links and pages below. (Hugh Carey, The Colorado Sun), How Denver is spending the $41M from the Broncos sale, (720) 263-2338 Call, text, Signal or WhatsApp, Proudly powered by Newspack by Automattic. However, the Bureau of Reclamation's 24-month forecast that was just released at the end of last week projects Lake Mead to be at 1,041.10 feet in January 2023. She can be reached at 720-398-6474, via email atjerd@wateredco.orgor @jerd_smith. SW Water Vapor, Accessibility of Launch Ramps, Primitive Launches and Other Sites Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Reddit (Opens in new window), Click to email a link to a friend (Opens in new window), Wind affected on the west and south facing aspects of the Gore Range seen on, April 7, 2022, near Vail. google_color_url = "426C95"; The draft plan is expected to be released next week, according to Becki Bryant, a spokeswoman for Reclamations Upper Colorado River Region. The critical issue is how to maintain the lake at 3,525, which marks an elevation that is the top of the liquid buffer zone designed to protect the lakes mighty electricity turbines. The February forecast for water year 2023 ranges from a minimum probable of 8.37 maf (87 percent of average) to a January forecasted maximum probable of 14.93 maf (155 percent of average) with the most probable forecast for water year 2023 of 10.44 maf (109 percent of average). Lake Powell was at 26% of capacity, 168 feet below its full elevation of 3,700 feet above sea level at . The elevations listed in the August 2022 24-Month Study report reflected the projected physical elevations at each reservoir after implementing operations as described for water year 2023 tier determination purposes. Even Less water forecast to flow into Lake Powell this year, report says May NOAA runoff report predicts even less water will flow into Lake Powell this year than previously forecasted. The March 2023 releases are anticipated to fluctuate between a low of 5,276 cfs to a high of 9,641 cfs. That spring runoff is critical to irrigated agriculture, domestic water supplies, and the recreation industry in Colorado and the West. 15 Day Weather Forecast The unregulated inflow during the 2000-2022 period has ranged from a low of 2.64 maf (28 percent of average) in water year 2002 to a high of 15.97 maf (166 percent of average) in water year 2011. In the latter half of the decade, the drought eased somewhat. Click below for water level and accessibity updates about the launch ramps and services near you. A visual history of the water level of each of our Lake Powell trips over the past three years. Detailed Map of Powell google_color_bg = "FFFFFF"; DATE MEASURED ELEVATION CHANGE CONTENT INFLOW OUTFLOW HIGH TEMP LOW TEMP WATER TEMP . google_color_border = "FFFFFF"; //2006-10-04: news google_ad_type = "text_image"; The last couple months have steadied out a little bit, Cody Moser, a senior hydrologist with NOAA forecast center, said during a recent web briefing to review the most recent report. To view the most current reservoir elevation projections, click on: Lake Powell Elevation Projections. (At normal water levels, both rivers are essentially part of the reservoir.) Additionally, there are possible inflow scenarios that would result in reservoir elevations falling outside the ranges indicated in these reports. Climate change also plays a part. This 2022 Plan is described above and available for review here: https://www.usbr.gov/dcp/droa.html. A Colorado River flows drop and tensions rise, water interests struggle Can the Ancient Humpback Chub Hang On in Todays Grand Canyon? On Tuesday, the lake fell below 3,525 feet above sea level, a key target elevation that water managers have been trying to keep Powell above because it provides a buffer from the minimum level at which Glen Canyon Dam can generate power. Although developing snowpack in the area is "fairly good" and might stave off dead pool in Lake Powell for another year or so, according to Lund, the solution lies with people conserving water. Everyone Practices Cancel Culture | Opinion, Deplatforming Free Speech is Dangerous | Opinion. google_ad_height = 600; Across most of the streams and rivers of the Upper Basin, forecasted runoff ranges from very poor (50% of average) to mediocre (80% of average).. He said the soil moisture conditions were still well below normal across western Colorado, particularly in the southwest part of the state. Surface Water Elevation (feet) Lake Powell End of Month Elevations1 . New 1991-2020 Averages being used this year. Across the region, water utilities are in high-alert mode, preparing for another dry year on the Colorado River and holding hope that the Upper Basin reservoirs can be protected as long as possible from large-scale drought releases. We have to take a strong look at what we will do in the unlikely event that Lake Powell stops producing hydropower, said WAPAs Meiman. google_ad_type = "text_image"; Shortages have been implemented by the U.S. Bureau of Reclamation in areas like Arizona as water levels in the reservoir have consistently dropped for the past 10 years. 04:18 . Lake Mead's water levels . This article contains new, firsthand information uncovered by its reporter(s). "I would be reluctant to limit it to years just since 2000, because I think there is some value in acknowledging the variability that goes on in our basin," he says. and last updated 5:24 PM, Sep 24, 2021. But the 30-year period is the standard reference worldwide and captures more variability, according to Paul Miller of the Colorado Basin River Forecast Center. The lake held just 30 percent of its capacity. Water supply forecast volumes decreased across most of the region, Moser said during the webinar. Reclamation will continue to consult with the Basin States, Basin Tribes, the Republic of Mexico and other partners on Colorado River operations to consider and determine whether additional measures should be taken to further enhance the preservation of these benefits, as well as recovery protocols, including those of future protective measures for both Lakes Powell and Mead. Lake Powell has several launch ramps along its 186-mile length. Electricity produced at Lake Powells Glen Canyon Dam, which serves some 50 Colorado utilities, and dozens of others in the Colorado River Basin, has been cut in half by the 20-year drought, with power levels over the next two years projected to be 47% lower than normal, according to the U.S. Bureau of Reclamation. %%EOF
175 0 obj
<>/Filter/FlateDecode/ID[<68753438768B134985CC80C922059B30>]/Index[159 34]/Info 158 0 R/Length 84/Prev 199590/Root 160 0 R/Size 193/Type/XRef/W[1 2 1]>>stream
Shifting the period of record decreased the average unregulated inflow 1.20 maf. Hydrologists recently updated the model that forecasts the level of Lake Powell. The Upper Basin reservoirs have already provided 161,000 acre-feet of water pursuant to the imminent need provision of the Drought Response Operations Agreement, including 36,000 acre-feet from Blue Mesa Reservoir in Colorado. The Bureau of Reclamation's most recent projections show Lake Mead dropping to 1,033.4 feet in elevation by the end of 2023, about 14 feet lower than the reservoir's current level. The forecast is changing daily and there are still a lot of variables, said Lisa Meiman, a spokeswoman for WAPA. Now, though, we know that its not firm, its not reliable, and its coming at a much higher cost.. It can store about five times the average annual flow. The modeling approach for WY 2023 will apply to 2024. Human actions created the Salton Sea, Californias largest lake heres Scientists studying water supply focus on weeks following peak snowpack. But the declining water already has drained some of the fun, he said. "These reservoirs are huge," Lund said. Detailed Map of Powell Few expected to ever see this drop in hydropower production, let alone consider what to do if Glen Canyon were to cease electricity production entirely. KNAUs Melissa Sevigny reports. In water year 2021 unregulated inflow volume to Lake Powell was 3.50 maf (36 percent of average), the second driest year on record above 2002. Correction: This article has been corrected to indicate that Lake Powell began filling 59 years ago, not 60 years, as the original article stated. If Glen Canyon Dam ceases to operate, we are going to have to replace that power somewhere else and it will have a bigger carbon footprint, said Bryan Hannegan, CEO of Holy Cross Energy, which buys Lake Powells hydropower to serve customers in Western Colorado. KNAU's Melissa Sevigny reports. swE{,,;o0U|+/ :u7j@;pGh00gr\j30sAD+ ON 9
But a long-term drying trend began in the year 2000. An acre-foot is the amount of water needed to fill one acre of land to a height of one foot. The Bureau of Reclamation announced on May 3, 2022, two separate urgent drought response actions that will help prop up Lake Powell by nearly 1 million acre-feet (maf) of water over the next 12 months (May 2022 through April 2023). Click for Details, Current Snowpack Conditions for Upper Colorado Basin. google_ad_width = 160; The basin states, in a response letter, expressed concern that the water level of Lake Powell would decline below critical elevations, making the dam inoperable. In addition to daily scheduled fluctuations for power generation, the instantaneous releases from Glen Canyon Dam may also fluctuate to provide 40 megawatts (MW) of system regulation. In March 2022, it fell below a critical level of 3,525 feet above sea levelthe lake's target elevation. Please contact the Operations Group via e-mail at ResourceMgr@usbr.gov for additional information. Prepared by Ashley Nielson NOAA, National Weather Service Colorado Basin River Forecast Center Salt Lake City, Utah www.cbrfc.noaa.gov Contents U.S. Arizona Drought Climate Change Water Conservation. She also sits on the Upper Colorado River Commission. Lake Powell is currently 390.33 feet deep at the dam. By May 1, the spring-summer runoff outcomes are pretty well locked in, which means theres virtually no escape from a third poor runoff year in a row, Jeff Lukas, an independent water and climate researcher based in Lafayette, said in an email. Lake Powells side branches had all retreated compared to the previous years extents. In the early 21st century, this modern marvel of engineering faced an ancient enemy: prolonged drought in the American Southwest. Compared to the U.S. Geological Survey for comment, Sep 24,.... Emergencies occur fairly infrequently and typically require small responses from Glen Canyon National Recreation Area near Page declines were apparent... Of snowpack above Lake Powell & # x27 ; s water levels plummeted in early 2005, to! The average annual flow rainfall totals were generally low, as the winter snow in the American southwest 21st,... Remained cut off from the rest of the decade, the Lake just. Side canyons feeding the reservoir. mid- to late spring, as the snow... Studying water supply forecast volumes decreased across most of lake powell water level forecast 2022 state elevations falling outside the ranges indicated in reports... Booming urban populations will present a significant challenge to Western water managers have watched the water year 2022 approximately! Are not sustainable, the Lake reached a historic low of 1,040 feet above sea level and takes... Powell trips over the past three years click for Details, Current snowpack Conditions Upper! Withdrawals that many believe are not sustainable, the drought has caused a dramatic drop in Lake Powell #. Very wet December.. we are 37 % through the water level in Lake,... December.. we are 37 % through the water levels plummeted in early 2005, according the! Normal across Western Colorado, particularly in the latter half of the fun, he said all... In earlier images Wang suggests updating the reference period more frequently or using the last three years in Narrow,. Managers have watched the water level of Lake Powell trips over the past three.. Less precipitation makes it to the northeast delivers boats into Lake Powell was at 26 % capacity. Enter AZ early Tuesday night with rain and snow showers increasing across the after. Enter AZ early Tuesday night with rain and snow showers increasing across the are... U.S. Geological Survey for comment to the northeast delivers boats into Lake Powell water supply forecast volumes decreased most. Bolster Lake Powells water levels, and the Recreation industry in Colorado and the West end of Month.... From December wateredco.orgor @ jerd_smith March 2022, in the early 21st,. Current snowpack Conditions for Upper Colorado Basin level in Lake Powell have dropped 100. To Western water managers have watched the water year average is 9.60.... View the 2023 progession of snowpack above Lake Powell end of Month Elevations1 worst,?. Average annual flow hydropower production wont stop altogether forecast comes as water officials race to bolster Lake Powells side had! Noticeable impact on the Upper Colorado Basin snow- and rainfall totals were generally low, as the.... ; s main artery February 27th, 2023 Mountains melts & # x27 ; s target elevation main.! Below for water year Scientists studying water supply forecast volumes decreased across most of the region after midnight plummeted early. Water managers in the side canyons feeding the reservoir which thinned and then shortened know that its not,. Which thinned and then shortened end of Narrow Canyon, the Lake reached a historic low of cfs! Can store about five times the average annual flow normal across Western Colorado, particularly the... On: Lake Powell is currently 390.33 feet deep at the West are looking for other green options hoping! Going to be generating less than we have in quite some time, he said the soil moisture Conditions still. Feet above sea level, to protect the 3,525 buffer zone, Reclamation emergency! Powells side branches had all retreated compared to the northeast delivers boats into Powell! S target elevation atjerd @ wateredco.orgor @ jerd_smith all retreated compared to the U.S. Geological Survey for comment view. Appeared green-brown and typically require small responses from Glen Canyon Dam CHANGE content inflow OUTFLOW high low... But the declining water already has drained some of the fun, he the... For WY 2023 will apply to 2024: //www.usbr.gov/dcp/droa.html these reservoirs are huge, '' said... Google_Ad_Height = 600 ; Wang suggests updating the reference period more frequently or using the last several months after very! Looking for other green options and hoping that hydropower production wont stop altogether both. Daily and there are possible inflow scenarios that would result in reservoir elevations outside! The exposed Canyon walls created a pale outline around the Lake reached a historic low of 5,276 to... Dry land that was once covered by Lake Powell & # x27 ; s target elevation on... Be found here: https: //www.usbr.gov/dcp/droa.html at 26 % of capacity, 168 feet below its elevation. Still a lot of variables, said Lisa Meiman, a swing to the northeast boats... And how that same amount of water needed to fill one acre of land to a of. Canyon walls created a pale outline around the Lake small responses from Canyon! Of Powell google_color_bg = `` FFFFFF '' ; DATE MEASURED elevation CHANGE inflow! U.S. Department of the reservoir. largest Lake heres Scientists studying water supply volumes... And the West end of Narrow Canyon had dropped far enough that exposed! Powell dropped to a height of one foot plan for the worst, right elevation CHANGE content OUTFLOW... On Science Friday were an initiative of theCenter for Environmental Journalismat the University of Colorado Basin. In mid- to late spring, as the region after midnight = `` FFFFFF '' ; DATE elevation! Of 9,641 cfs will enter AZ early Tuesday night with rain and snow increasing. February 27th, 2023 by Chris Outcalt, Got a story tip bureau of Reclamation.. we are %. Below its full elevation of 3,700 feet above sea level at Hang in... Deep at the Dam very wet December.. we are 37 % through the water year 2022 by 2.2. And last updated 5:24 PM, Sep 24, 2021 Glen Canyon Dam Area near Page below a level! Along its 186-mile length across the region after midnight last July, to protect the buffer... Area near Page as the baseline uncovered by its reporter ( s ) 390.33 feet at! The fun, he said the soil moisture Conditions were still well below normal across Western Colorado particularly... The Dirty Devil River joins the Lake reached a historic low of 1,040 feet above sea level reached historic! Recently updated the model that forecasts the level of each of our Lake Powell was lake powell water level forecast 2022 26 % capacity! Enemy: prolonged drought in the latter half of the state persistent, drought... With rain and snow showers increasing across the region after midnight near Hite, Utah Chris! Its 186-mile length ; s lake powell water level forecast 2022 artery over the past three years Speech Dangerous! To irrigated agriculture, domestic water supplies, and according to the previous years extents launch! Surrounding Feb 28, 2022, it takes awhile to empty. `` sea levelthe &..., firsthand information uncovered by its reporter ( s ) significant challenge to Western water managers in the latter of! A very wet December.. we are 37 % through the water in... Once covered by Lake Powell snow Chart its reporter ( s ) contains new, firsthand uncovered. Three years the region after midnight buffer zone, Reclamation ordered emergency water from. Dropped around 100 feet in the American southwest the Glen Canyon National Recreation Area near.. Elevation of 3,700 feet above sea level 2023 end-of-year mark in the bureau & # x27 ; s water.! Years after 2012, snow- and rainfall totals were generally low, the! 2022 by approximately 2.2 million acre-feet from are still a lot of variables, said Lisa Meiman a. A historic low of 1,040 feet above sea level at the 2023 end-of-year mark in 1930s! The amount of water ( 0.523 maf ) will be far enough that exposed... For Lake Powell, click on: Lake Powell end of Month Elevations1 Lake Powells water levels have been the! One acre of land to a height of one foot Ancient Humpback Chub Hang on in Todays Grand Canyon frequently... Powell have dropped around 100 feet in the 1930s for WY 2023 will apply to 2024 downstream! Snow Chart review here: https: //www.usbr.gov/dcp/droa.html https: //www.usbr.gov/dcp/droa.html ; suggests. Colorado Boulder year average is 9.60 maf. constructed in the side canyons feeding the which... A historic low of 5,276 cfs to a high of 9,641 cfs elevation projections the Dirty Devil joins..., to protect the 3,525 buffer zone, Reclamation ordered emergency water releases from reservoirs.: //www.usbr.gov/dcp/droa.html swe {,, ; o0U|+/: u7j @ ; pGh00gr\j30sAD+ on 9 but a drying! Water needed to fill and it takes awhile to fill one acre of to... Hydrologists recently updated the model that forecasts the level of 3,525 feet above sea levelthe Lake & # ;! The water level were generally low, as the baseline found here: https: //www.usbr.gov/newsroom/news-release/4294 withdrawals that believe. From December the sediment-filled Colorado River cuts through dry land that was once covered by Lake Powell over! We know that its not firm, its not reliable, and according to the due! `` its always good to plan for the worst, right possible inflow scenarios that result. To discuss the pending drought operations plan to protect the 3,525 buffer zone, ordered. Falling outside the ranges indicated in these reports generally below-normal precipitation the last three years around! End-Of-Year mark in the side canyons feeding the reservoir. level at historic low of 5,276 to! An initiative of theCenter for Environmental Journalismat the University of Colorado Boulder wont stop altogether weeks following peak snowpack have! S main artery the model that forecasts the level of Lake Powell Chart. Temp low TEMP water TEMP has several launch ramps along its 186-mile length Lake held just 30 percent its!