Hydrology, Hydraulics, and Water Management Technical Report

U.S. Bureau of Reclamation (USBR) | December 15th, 2014

This Technical Report describes pertinent hydrologic and hydraulic condition and water management operations for Shasta Lake, the Sacramento River, the Delta, and the CVP

This Technical Report describes pertinent hydrologic and hydraulic condition and water management operations for Shasta Lake, the Sacramento River, the Delta, and the CVP/State Water Project (SWP) service areas, under existing conditions, the No-Action Alternative, and the Action Alternatives for the SLWRI.

Our Changing Planet: The U.S. Global Change Research Program for Fiscal Year 2024

U.S. Global Change Research Program (USGCRP) | April 19th, 2024

The U.S. Global Change Research Program (USGCRP) advances global change science and informs our national response to the climate crisis—from President Biden’s climate

The U.S. Global Change Research Program (USGCRP) advances global change science and informs our national response to the climate crisis—from President Biden’s climate, environmental justice, and nature priorities to decisions at all levels of government and society. Our Changing Planet: The U.S. Global Change Research Program for Fiscal Year 2024 presents highlights of USGCRP’s recent accomplishments, outlines federal investments in global change research, and sets future priorities for federal global change research as USGCRP implements its 2022-2031 Strategic Plan.

U.S. Global Change Research Program (USGCRP)

Congressional Research Service (CRS) | April 1st, 2025

The U.S. Global Change Research Program (USGCRP) is an interagency program established by Congress through the Global Change Research Act of 1990 (GCRA; P.L. 101-606) to

The U.S. Global Change Research Program (USGCRP) is an interagency program established by Congress through the Global Change Research Act of 1990 (GCRA; P.L. 101-606) to coordinate and integrate federal research on global change. Global change refers to global environmental changes in the Earth’s climate, land productivity, water resources, atmospheric chemistry, and ecological systems that may affect Earth’s capacity to sustain life. USGCRP was established to enhance scientific understanding of global changes and assess their potential impacts, and for the program’s results to be useful for those developing policy responses. As the Trump Administration looks to alter executive branch activities related to climate change, an issue for the 119th Congress may be whether—and if so, how—to alter congressional direction and funding for USGCRP and its activities.

Our Changing Planet: The U.S. Global Change Research Program for Fiscal Year 2025

U.S. Global Change Research Program (USGCRP) | January 3rd, 2025

This Fiscal Year 2025 edition of USGCRP’s annual report to Congress highlights advancements in science and information delivery that show how the Program is meeting nat

This Fiscal Year 2025 edition of USGCRP’s annual report to Congress highlights advancements in science and information delivery that show how the Program is meeting national needs. The Five-Year Progress section provides a longer-term look at USGCRP work on three selected topics: understanding the changing water cycle; responding to needs for climate information; and advancing diversity, equity, inclusion, justice, and accessibility across global change research efforts. We also highlight more recent activities in the 2023 Accomplishments section and look ahead to upcoming work in the Current and Future Priorities section.

Fifth National Climate Assessment

U.S. Global Change Research Program (USGCRP) | November 14th, 2023

Led by USGCRP and its 14 member agencies, NCA5 draws on the expertise of nearly 500 authors and 250 contributors from every state, as well as Guam, Puerto Rico, and the U

Led by USGCRP and its 14 member agencies, NCA5 draws on the expertise of nearly 500 authors and 250 contributors from every state, as well as Guam, Puerto Rico, and the U.S. Virgin Islands. NCA5 is the most up-to-date and comprehensive assessment of climate change in the United States, providing authoritative, decision-relevant information on how people across the country are experiencing climate change, the risks we face now and in the future, and actions underway to reduce greenhouse gas emissions and build resilience. The Assessment evaluates climate impacts across 10 U.S. regions and a wide range of interests, including water, forests and ecosystems, coasts and oceans, agriculture and rural communities, the built environment, energy and transportation, health and air quality, and economic and social systems. *This document, which was deleted from the federal websites that funded it by Trump administration political appointees,  is made available through the Internet Archive

Assessing Spatial Variability of Nutrients, Phytoplankton, and Related Water-Quality Constituents in the California Sacramento–San Joaquin Delta at the Landscape Scale: Comparison of Four (2018, 2020, 2021, 2022) Spring High-Resolution Mapping Surveys

U.S. Geological Survey (USGS) | July 2nd, 2025

This report summarizes results from boat-based, high-resolution water-quality mapping surveys completed before, during, and after upgrades to the EchoWater Resource Recov

This report summarizes results from boat-based, high-resolution water-quality mapping surveys completed before, during, and after upgrades to the EchoWater Resource Recovery Facility (EchoWater Facility), the regional wastewater facility for the City of Sacramento and surrounding areas, near Elk Grove, California. Surveys were completed in the tidal aquatic environments of the Sacramento–San Joaquin Delta (Delta) in spring (May or June) 2018, 2020, 2021, and 2022. In each survey, a suite of in situ sensors were used to continuously (one measurement per second) measure water-quality conditions, nutrients, phytoplankton abundance, and species composition. In addition to in situ data collection, discrete water samples were collected about every 2 miles while underway for determination of phosphate, ammonium, and nitrate concentration.

Statement of Findings regarding the Approval of the Sacramento Valley – Antelope Subbasin 2024 Groundwater Sustainability Plan

California Department of Water Resources (DWR) | February 27th, 2025

Anderson-Cottonwood Irrigation District Integrated Regional Water Management Program – Groundwater Production Element Project

U.S. Bureau of Reclamation (USBR) | August 15th, 2011

This project would improve the flexibility and reliability of the District’s water supply, particularly during dry and critically dry water years. In 2004, ACID’s sur

This project would improve the flexibility and reliability of the District’s water supply, particularly during dry and critically dry water years. In 2004, ACID’s surface water rights were reduced from 165,000 to 121,000 ac-ft per year as part of the renegotiation of the 40-year Settlement Contract. Furthermore, the west side of the District’s system has little to no downstream control. Control of the system is achieved at the head of the 35-mile main canal, causing some delivery difficulties at the downstream end of the service area. By pushing water from upstream to downstream without an ability to manage intermediate water surface elevations, downstream response time to water delivery needs can be greatly hindered. This project would help with the flexibility and reliability required to meet agricultural water needs.

Geohydrology of the Parker-Blythe-Cibola Area, Arizona and California

U.S. Geological Survey (USGS) | July 16th, 1973

The Parker-Blythe-Cibola area, as defined in this report, extends from the bedrock narrows north of Parker, Ariz., southward for about 85 miles along the valley of the Co

The Parker-Blythe-Cibola area, as defined in this report, extends from the bedrock narrows north of Parker, Ariz., southward for about 85 miles along the valley of the Colorado River to the bedrock narrows below Cibola, Ariz. The area is about midway between Hoover Dam and the Gulf of California. It includes parts of Yuma County, Ariz., and Imperial, Riverside, and San Bernardino Counties, Calif.

California’s Sustainable Groundwater Management Act and the Half-Exemption of Owens Valley Groundwater Basin

University of California, Los Angeles (UCLA) | May 1st, 2024

This Comment first uses historical accounts and secondary sources to describe the history of Owens Valley groundwater. It next describes the Governing Documents that curr

This Comment first uses historical accounts and secondary sources to describe the history of Owens Valley groundwater. It next describes the Governing Documents that currently manage this groundwater. It ends its history by relying on the content of OVGA meetings to tell the recent story of SGMA’s implementation in Owens Valley.