Tag Archive for: Colorado River Basin

Colorado River Proposal-April 2023-USBR-San Diego County Water Authority-IID

Water Authority Supports Talks on Fed Draft Colorado River Proposal

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The San Diego County Water Authority supports a consensus-based approach for long-term solutions to water supply issues in the Colorado River Basin. The U.S. Bureau of Reclamation on April 11 released a draft environmental document that considers changes to near-term operations on the Colorado River, including potential reductions in water supplies for California and across the Lower Colorado River Basin.

Colorado River Proposal

Reclamation’s draft Supplemental Environmental Impact Statement (SEIS) analyzes two alternatives, plus a no-action alternative, to protect critical elevations at Lakes Mead and Powell, the two reservoirs California depends on for its river supplies. Both reservoirs have declined due to unprecedented low levels from more than two decades of drought.

The release of the draft SEIS, which would modify the set of operating guidelines that manage river operations through 2026, comes even as heavy snows this winter signal some relief on the river.

Collaboration and consensus-based approach

“While this winter’s storms delivered an incredible snowpack, the release of the draft SEIS highlights that we need to continue to work with all Basin states, the tribes and Mexico toward a consensus-based approach that provides real and lasting solutions for all water users,” said Dan Denham, deputy general manager for the San Diego County Water Authority.

The first of the two action alternatives in the draft SEIS acknowledges the priority system for water rights under existing agreements and laws. The San Diego region’s river supplies are largely protected from reductions because they are tied to California’s senior rights within the Lower Colorado River Basin as well as the Imperial Irrigation District’s (IID) high priority rights through the Water Authority’s conserved water transfer agreement with IID.

The second alternative calls for Reclamation to analyze the effects of reductions “distributed in the same percentage” for all water users in the Lower Basin states – California, Arizona and Nevada – despite there being no precedent or foundation for this approach under existing laws. It would mean across-the-board reductions for all water users in the region, including those with senior water rights.

Reclamation has stated it is expecting input from states, tribes and water agencies to fine-tune and adjust these alternatives. Discussions are ongoing between stakeholders.

Colorado River Board of California

“The Water Authority will continue to work in collaboration with our partners on the Colorado River Board of California to ensure California’s high priority water rights on the river are upheld through this SEIS process while we also work with all river stakeholders to develop long-term, durable solutions for the river,” Denham said.

The draft SEIS will be available for public comment for 45 calendar days and the final SEIS is anticipated to be available with a Record of Decision in Summer 2023, according to the Bureau of Reclamation. Comments on the draft SEIS are due May 30. This document will inform the August 2023 decisions that will affect 2024 operations for Glen Canyon and Hoover Dams.

The proposal to address immediate water supply challenges complements Reclamation’s ongoing process to develop new guidelines for Colorado River Operations when the current interim guidelines expire at the end of 2026.

Opinion: Is the San Diego-Imperial Model Part of the Solution for Colorado River Woes?

/in , , , /by /The San Diego Union-Tribuneby Michael Smolens Mentioned: San Diego County Water Authority

In a sense, the record string of storms that hit California created two lakes — one real and one hypothetical.

The deluges re-established Tulare Lake, once the largest lake west of the Mississippi River that was drained long ago for agriculture and municipal water demands.

Meanwhile, the state’s record snowpack, according to the Los Angeles Times, holds enough water to fill the depleted Lake Mead on the Colorado River. Of course, that’s not where the runoff goes.

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Wet Winter Improves Colorado River Forecast; Big Cuts Still Coming

/in , , /by /Las Vegas Review-Journal by Colton Lochhead

An already wet winter in the mountains that feed the Colorado River got even better in March, providing a significant boost to the amount of water that forecasters expect to flow downstream into Lake Powell this summer.

The latest prediction from the National Weather Service’s Colorado Basin River Forecast Center shows that the river will swell to 177 percent of its average volume during the all-important April-through-July period as the snow melts and flows into the river and its tributaries.

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Opinion-Colorado River Basin-San Diego County Water Authority-Smolens

Is the San Diego-Imperial Model Part of the Solution for Colorado River Woes?

/in , /by /The San Diego Union-Tribuneby Michael Smolens Mentioned: San Diego County Water Authority

In a sense, the record string of storms that hit California created two lakes — one real and one hypothetical.

The deluges re-established Tulare Lake, once the largest lake west of the Mississippi River that was drained long ago for agriculture and municipal water demands.

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Record snowpack-April 2023-drought-California

Record Snowpack Conditions in California, Parts of Southwest

/in , /by by NRCS/WNN

After a three-year drought in California and throughout the Southwest, many states throughout the West are measuring record snowpack conditions at NRCS SNOTEL stations and snow courses. Utah especially has seen a benchmark year for snowfall levels throughout the state.

Record snowpack

In California, the statewide snowpack (April 5) was 243% of normal, with the Northern Sierra at 198%, Central Sierra at 242%, and Southern Sierra at 302%. The California Department of Water Resources reported that the 2022-23 season will go down as one of the largest snowpacks on record in California.

In Nevada and Utah, current SWE percentages of median for select basins are as follows: Central Lahontan 273%, Central Nevada Desert Basins 267%, Great Salt Lake 224%, Lower Green 202%, Upper Colorado-Dolores 207%, and Upper Colorado-Dirty Devil 219%, according to the NRCS SNOTEL network.

In Arizona and New Mexico, snowpack levels are above normal, especially in the ranges of northern and central Arizona. In Arizona, the total reservoir system (Salt and Verde River system) is currently 100% full as compared to 72% full at the same time last year, according to the Salt River Project. For the Colorado River system, the U.S. Bureau of Reclamation is reporting (April 4) Lake Mead at 28% full and Lake Powell at 23% full.”

Agricultural weather highlights

“A significant Western warming trend during the weekend and early next week will increase streamflow due to melting snow. On April 10-11, temperatures should briefly top 95°F in lower elevations of the Desert Southwest. Periods of Northwestern precipitation will add to the runoff potential in that region. Meanwhile, little or no precipitation will fall during the next 5 days across a vast swath of the country, including southern California and the Plains, Southwest, Midwest, and Northeast.

Farther south, however, 5-day rainfall could total 1 to 3 inches or more from eastern Texas to the Carolinas, with the bulk of the rain falling by Saturday. The NWS 6- to 10-day outlook for April 11 – 15 calls for the likelihood of below-normal temperatures in California, the Great Basin, and the Northwest, while warmerthan-normal weather will dominate the central and eastern U.S. Meanwhile, above-normal precipitation from the Rockies into the Plains and upper Midwest should contrast with drier-than-normal conditions in the East (excluding Florida’s peninsula) and much of California.”

(Editor’s Note: The Natural Resources Conservation Service produces the weekly Water and Climate Update using data and products from the National Water and Climate Center and other agencies. The report focuses on seasonal snowpack, precipitation, temperature, and drought conditions in the U.S.)

Science Tackles the West’s Megadrought

/in , , /by /Yale Climate Connectionsby Tanya Petach & Emilio Mateo

Taps ran dry in Rio Verde on New Year’s Day.

Water had to be trucked in for household use in the affluent suburb outside Scottsdale, Arizona. The approximately 1,000 residents of the large, suburban stucco homes of Rio Verde were forced to take shorter showers and eat from paper plates.

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Snowpack Peaks at 160% of Normal as Colorado River Water Flows Toward Lake Mead

/in , /by /8 News Now (KLAS-TV)by Greg Haas

It’s snowing today in the central Colorado Rockies, likely the last hurrah for a year to remember for everyone who depends on water from the Colorado River — including Las Vegas.

It’s just past the early April peak when scientists calculate the final snowpack levels for the year. Today, that measurement hit 160% of normal, just above where it was a week ago.

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Colorado River Basin Reservoirs Still Face Grim Outlook Despite Healthy Snowpack

/in , , /by /The Colorado Sunby Shannon Mullane

The healthy snowpack whitening Colorado’s mountain peaks has given water officials some breathing room to manage the Colorado River Basin’s ongoing drought. The challenge will be not to squander it.

As winter storms wind down, water managers and policymakers are mulling over decisions about how to release and retain water in shrunken reservoirs across the basin, which supports 40 million people across the West.

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Sierra Nevada Snowpack: One of the Largest on Record

/in , /by /California Department of Water Resources / WNN

Following three consecutive years of drought in California, the Sierra Nevada snowpack is one of the most bountiful in more than 40 years. While the snowpack and snow water equivalent is great news for water supply, there are concerns the record snowpack could create flooding issues.

The California Department of Water Resources electronic readings from 130 snow sensors placed throughout the state indicate the statewide Sierra Nevada snowpack’s snow water equivalent is 61.1 inches, or 237% of average for April 3. The snow water equivalent measures the amount of water contained in the snowpack and is a key component of DWR’s water supply forecast.

Sierra Nevada snowpack

This year’s April result from the statewide snow sensor network is higher than any other reading since the snow sensor network was established in the mid-1980s. Before the network was established, the 1983 April 1 statewide summary from manual snow course measurements was 227% of average. The 1952 April 1 statewide summary for snow course measurements was 237% of average.

“This year’s severe storms and flooding is the latest example that California’s climate is becoming more extreme,” said DWR Director Karla Nemeth after the April 3 snow survey at Phillips Station in the Sierra Nevada. Photo: Fred Greaves/California DWR

“California’s climate is becoming more extreme”

“This year’s severe storms and flooding is the latest example that California’s climate is becoming more extreme,” said DWR Director Karla Nemeth. “After the driest three years on record and devastating drought impacts to communities across the state, DWR has rapidly shifted to flood response and forecasting for the upcoming snowmelt. We have provided flood assistance to many communities who just a few months ago were facing severe drought impacts.”

Just as the drought years demonstrated that California’s water system is facing new climate challenges, this year is showing how the state’s flood infrastructure will continue to face climate-driven challenges for moving and storing as much of these flood water as possible.

Sierra Nevada snowpack-snow survey-DWR-

“This year’s result will go down as one of the largest snowpack years on record in California,” said Sean de Guzman, manager of DWR’s Snow Surveys and Water Supply Forecasting Unit. (R-to-L: de Guzman, Jacob Kollen, Water Resources Engineer in Snow Surveys and Water Supply Forecasting Unit, and Jordan Thoennes, Water Resources Engineer in Snow Surveys and Water Supply Forecasting Unit.) Photo: Kenneth James/California DWR

“One of the largest snowpack years on record”

“This year’s result will go down as one of the largest snowpack years on record in California,” said Sean de Guzman, manager of DWR’s Snow Surveys and Water Supply Forecasting Unit. “While 1952’s snow course measurements showed a similar result, there were fewer snow courses at that time, making it difficult to compare to today’s results. Because additional snow courses were added over the years, it is difficult to compare results accurately across the decades with precision, but this year’s snowpack is definitely one of the biggest the state has seen since the 1950s.”

Sierra Nevada-snowpack-April 2023-DWR

Snowpack varies by region

For California’s snow course measurements, only 1952, 1969 and 1983 recorded statewide results above 200% of the April 1 average. While above average across the state this year, snowpack varies considerably by region. The Southern Sierra snowpack is currently 300% of its April 1 average and the Central Sierra is at 237% of its April 1 average. However, the critical Northern Sierra, where the state’s largest surface water reservoirs are located, is at 192% of its April 1 average.

Flooding and spring snowmelt

The size and distribution of this year’s snowpack is also posing severe flood risk to areas of the state, especially the Southern San Joaquin Valley. DWR’s State-Federal Flood Operations Center (FOC) is supporting emergency response in the Tulare Lake Basin and Lower San Joaquin River by providing flood fight specialists to support ongoing flood response activities and by providing longer-term advanced planning activities.

The FOC and DWR’s Snow Surveys and Water Supply Forecasting Unit are helping local agencies plan for the spring snowmelt season by providing hydraulic and hydrologic modeling and snowmelt forecasts specific to the Tulare Lake Basin that are informed by DWR’s snowmelt forecasting tools, including Airborne Snow Observatory (ASO) surveys.

Storms this year have caused impacts across the state including flooding in the community of Pajaro and communities in Sacramento, Tulare, and Merced counties. The FOC has helped Californians by providing over 1.4 million sandbags, over 1 million square feet of plastic sheeting, and over 9,000 feet of reinforcing muscle wall, across the state since January.

State Water Project deliveries increased

On March 24, DWR announced an increase in the forecasted State Water Project deliveries to 75%, up from 35% announced in February, due to the improvement in the state’s water supplies. Governor Gavin Newsom has rolled back some drought emergency provisions that are no longer needed due to improved water conditions, while maintaining other measures that continue building up long-term water resilience and that support regions and communities still facing water supply challenges.

Sierra Nevada Snowpack-April 2023-Reservoir conditions

Water supply challenges

While winter storms have helped the snowpack and reservoirs, groundwater basins are much slower to recover. Many rural areas are still experiencing water supply challenges, especially communities that rely on groundwater supplies which have been depleted due to prolonged drought.

Water conservation ‘a way of life’

Long-term drought conditions in the Colorado River Basin will also continue to impact the water supply for millions of Californians. The state continues to encourage Californians to make water conservation a way of life as more swings between wet and dry conditions will continue in the future. The San Diego County Water Authority and its 24 member agencies provide rebates and programs to encourage water conservation.

Given the size of this year’s snowpack with more snow in the forecast, DWR anticipates conducting a May snow survey at Phillips Station. That is tentatively scheduled for May 1.

It’s All White: Colorado’s Statewide Snowpack Tops 140%, Though Reservoirs Are Still Low

/in , , /by /The Colorado Sunby Jerd Smith

Colorado is awash in white this spring, with statewide snowpack topping 140% of average this week, well above the reading a year ago, when it stood at just 97% of normal.

“Conditions in the American West are way better than they were last year at this time,” state climatologist Russ Schumacher said Tuesday at a joint meeting Tuesday of the Water Availability Task Force and the Governor’s Flood Task Force.

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