Delta Narratives: Stitching a River Culture: Trade, Communication and Transportation to 1960

Delta Protection Commission (DPC) | June 1st, 2015

“Stitching a River Culture” explores three themes in the history of the California Delta: trade, communication, and transportation. Heretofore these three subjects ha

“Stitching a River Culture” explores three themes in the history of the California Delta: trade, communication, and transportation. Heretofore these three subjects have received scant attention, save the history of steamboating and recreational uses of the Delta in recent times. The purpose of the larger narrative is to provide museums, archives, and historical societies with a basic framework that includes these three themes in the context of the larger subjects of agriculture, various kinds of technologies, town building, and reclamation. This narrative begins before Spanish exploration and contact with Native peoples in the last quarter of the eighteenth century and includes the following eras: Spanish, Mexican, Gold Rush, and post?statehood??to around 1960.

Delta Operations for Salmonids and Sturgeon (DOSS) Technical Working Group

Delta Stewardship Council (Delta Council) | November 1st, 2018

Delta Reclamation District Financing and Budgets

Delta Stewardship Council (Delta Council) | August 16th, 2016

This report explains the financing of the 93 reclamation districts that maintain the Delta’s levees. Reclamation districts’ primary method for raising funds is thr

This report explains the financing of the 93 reclamation districts that maintain the Delta’s levees. Reclamation districts’ primary method for raising funds is through assessments, which are levied on a per-acre basis upon property owners within a district’s boundaries. Assessments are subject to Proposition 218 procedures, and they must be approved by a vote of the affected people. A second financing tool that reclamation districts have is charging fees for services, such as irrigation or drainage services for landowners. In addition to relying on these direct financing tools, reclamation districts can also receive funds from the State or from other entities. According to data from the State Controller’s office, the median Delta reclamation districts have annual budgets of around $370,000, with property assessments serving as the primary source of revenue. Typical assessments in these districts are about $32 per acre. State funding is a supplementary source of revenue for these districts, making up about 30 percent of total revenues. On the expenditure side, more than 80 percent of typical reclamation districts’ expenditures are for “services and supplies,” which includes levee work, but also other expenses. Only 12 Delta reclamation districts have long-term debt, so State funding appears to have been successful in helping Delta reclamation districts avoid overly burdensome debt levels. The State has concentrated its reclamation district funding on certain strategic islands. Ten reclamation districts have received 62 percent of state funding over the past five years. These 10 reclamation districts that receive the most state funding also tend to have much higher property assessment rates compared to other reclamation districts. This suggests that reclamation districts are increasing their assessment rates as the State steps up its funding. Finally, reclamation districts receiving a large amount of state funds also spend much more on services and supplies, even after controlling for the size of the reclamation district. This difference suggests that reclamation districts that are not receiving significant funding from the State are primarily paying for levee maintenance projects rather than undertaking large-scale levee improvement projects.

Delta Region Integrated Flood Management: Key Considerations and Statewide Implications

California Department of Water Resources (DWR) | September 1st, 2012

This Background / Reference Memorandum (BRM) presents highlights from flood-related technical, legislative and funding information regarding the Sacramento-San Joaquin De

This Background / Reference Memorandum (BRM) presents highlights from flood-related technical, legislative and funding information regarding the Sacramento-San Joaquin Delta (Delta), with emphasis on activities by the California Department of Water Resources (DWR). The BRM is intended to provide historical and existing conditions (year 2011) context for DWR’s use in conveying strategies for future investments in integrated flood management in the Delta under a separate document. The State of California has entrusted DWR as the agency with the responsibility for managing water flow through the Delta and for representing State interests in Delta levees. DWR invests in the Delta levee system to protect clear and identifiable State interests, including but not limited to: • Human life, public health, and property within the Delta; • Water quality and water supply for agriculture, ecosystem, and municipal and industrial water users within the Delta and water users outside of the Delta; • Ecosystem protection and enhancement, including protection and recovery of threatened and endangered species; • Critical infrastructure such as highways, railroads, aqueducts, and pumping plants; • Other infrastructure such as transmission lines (electric & petroleum), shipping channels, and public infrastructure (water and wastewater treatment plants); • Agriculture and recreation; and • Cultural, historical, aesthetic, and other values included in “Delta as a place.” State legislation and modifications to the California Water and Public Resources codes have repeatedly demonstrated the State’s interest in preserving the Delta and the importance of Delta levees. The legislation and modifications to the codes have made strong statements about the importance of the Delta, provided direction for the DWR’s levee programs, and provided funding for flood management activities and environmental stewardship in the Delta. This BRM should be considered a reference document. Due to the large number of existing documents on the Delta and its levees, this BRM provides highlights of important material with references to other documents for more detailed information. This base information should be useful when considering modifications to investment strategies for integrated flood management in the Delta.

Delta Regional Monitoring Program Annual Monitoring Report for Fiscal Year 2015–16: Pesticides and Toxicity

San Francisco Estuary Institute (SFEI) | March 1st, 2018

The primary purpose of this report is to document the first year (FY15/16) of pesticide monitoring by the Delta Regional Monitoring Program (Delta RMP). This document rep

The primary purpose of this report is to document the first year (FY15/16) of pesticide monitoring by the Delta Regional Monitoring Program (Delta RMP). This document reports the results from samples collected monthly from July 2015 through June 2016. The data described in this report are available for download via the California Environmental Data Exchange Network (CEDEN) website. Pesticide monitoring of the Delta RMP includes chemical analysis and toxicity testing of surface water samples. The parameters analyzed include 154 current use pesticides, dissolved copper, field parameters, and “conventional” parameters (ancillary parameters measured in the laboratory, such as dissolved/particulate organic carbon and hardness). Toxicity tests included an algal species (Selenastrum capricornutum, also known as Raphidocelis subcapitata), an invertebrate (Ceriodaphnia dubia, a daphnid or water flea), and a fish species (Pimephales promelas, fathead minnow). Toxicity testing included the evaluation of acute (survival) and chronic (growth, reproduction, biomass) toxicity endpoints. The surface water samples were collected from 5 fixed sites representing key inflows to the Delta that were visited monthly: Mokelumne River at New Hope Road, Sacramento River at Hood, San Joaquin River at Buckley Cove, San Joaquin River at Vernalis, and Ulatis Creek at Brown Road. A total of 52 pesticides were detected above method detection limits (MDLs) in water samples (19 fungicides, 17 herbicides, 9 insecticides, 6 degradates, and 1 synergist). A total of 9 pesticides (5 herbicides, 3 insecticides, and 1 degradate) were detected in suspended sediments in 10 of a total of 60 samples collected during the study period. All collected samples contained mixtures of pesticides ranging from 2 to 26 pesticides per sample. From a total of 154 target parameters, 100 compounds were never detected in any of the samples.

Delta Regional Monitoring Program Nutrients Synthesis: Modeling to Assist Identification of Temporal and Spatial Data Gaps for Nutrient Monitoring

San Francisco Estuary Institute (SFEI) | March 1st, 2018

Nutrient loads are an important water quality management issue in the Sacramento-San Joaquin Delta (Delta) and there is consensus that the current monitoring activities d

Nutrient loads are an important water quality management issue in the Sacramento-San Joaquin Delta (Delta) and there is consensus that the current monitoring activities do not collect all the information needed to answer important management questions.  The purpose of this report is to use hydrodynamic model outputs to refine recommendations for monitoring nutrients and related conditions in the Delta. The basic premise was that variability in water source and hydraulic residence time can serve to estimate variability in water quality. Therefore, using existing hydrodynamic models that are highly resolved in space and time could be a cost-effective way to get information about likely spatial and temporal variability in nutrients and nutrient-associated parameters. We assume that the Delta can be divided into relatively homogeneous subregions (e.g., such as those proposed in a previous report by Jabusch et al. 2016) and that a representative monitoring location can be chosen in each subregion to track status and trends. We also assume that, within any subregion, areas with long hydraulic residence time and source water mixing may represent potential nutrient transformation hotspots.  Two types of modeling approaches were applied: 1) volumetric water source analysis to evaluate the mix of source waters within each subregion; and 2) particle tracking simulations. Results from the source water analysis were evaluated to assess heterogeneity of water sources within each of the subregions. Results from the particle tracking analysis were evaluated to identify high-residence-time areas. Finally, we compared analysis results to current monitoring locations to inform potential monitoring gaps or redundancies within each of the subregions. 

Delta Salinity Management Workshops 2022 Information Sheet

Delta Stewardship Council (Delta Council) | March 7th, 2022

Delta Science Plan (2016 update)

Delta Stewardship Council (Delta Council) | May 9th, 2016

The Delta of the Sacramento and San Joaquin rivers is the hub of California’s extensive water supply system and critical to the State’s economy. However, emerging sca

The Delta of the Sacramento and San Joaquin rivers is the hub of California’s extensive water supply system and critical to the State’s economy. However, emerging scarcities of water in the Delta watersheds, which are expected to intensify with global warming, threaten California’s ability to sustain further economic development and population growth.  At the same time, patterns of water and land use have resulted in severe declines in the abundances of many valuable native species. Protecting and restoring these species while maintaining a reliable water supply and building California’s economic future is an absolute priority. The economic and environmental stakes in the Delta are enormous. Over 27 million people rely on Delta water and the ecosystem has been degraded to the point where over 60 native species are listed as threatened or endangered. The Delta and its water supply infrastructure are also highly vulnerable to earthquakes, floods, and droughts. Proposed actions under the Bay Delta Conservation Plan to reduce risks to the people, ecosystems and economy of California are likely to cost many billions of dollars. Achieving the co-goals of the Delta Plan will depend upon acquiring and communicating a new shared body of scientific knowledge to catalyze cultural change. The Delta Science Plan is intended to be that catalyst. The Delta Science Plan provides direction for achieving an integrated, collaborative and transparent science of the Delta to enhance policy and management decisions. The Plan is transformative and uses principles that have proven successful in other Big Science programs – embracing emerging technologies and fostering open science communities. The science plan uses collaboration to build trust and acquire a shared body of scientific knowledge. It proposes new mechanisms for synthesis and communication that will enhance decision-making and reduce conflicts that hinder policy decisions. Vigorous and sustained investment in the Delta Science Plan will ensure that the responsible agencies have the knowledge, trust and collaboration necessary to achieve the coequal goals.

Delta Science Plan (2019)

Delta Stewardship Council (Delta Council) | May 23rd, 2019

A coordinated, science-based approach is essential for managing the Sacramento-San Joaquin Delta (Delta) to achieve the vision of One Delta, One Science and further the

A coordinated, science-based approach is essential for managing the Sacramento-San Joaquin Delta (Delta) to achieve the vision of One Delta, One Science and further the coequal goals in a manner that enhances and protects the Delta as an evolving place. As members of the 18 federal and state agencies composing the Delta Plan Interagency Implementation Committee (DPIIC), we recognize that we must avoid a siloed, single-interest approach to management and science issues in the Delta. Such an approach hampers effective management and efficient resource use to address complex issues including increasing risks from climate change related effects such as sea level rise, prolonged dry periods, and floods. Our focus must be twofold: a more integrated effort among federal and state agencies and stakeholders to advance Delta-relevant scientific knowledge and using that knowledge to inform decisions that address these complex natural resource management issues. The Delta Science Plan is a call to action for a more collaborative Delta science community that contributes to improving decision-making in the Delta. This document provides direction for collectively prioritizing research questions, setting goals, developing shared protocols for how science is conducted, and verifying and communicating scientific results with an eye towards usability for decision-makers and the public. This direction is only possible if the Delta science community, including members of DPIIC, work together to implement and conduct work consistent with the actions identified in the document and to speak with one voice to marshal support for scientific efforts. The members of DPIIC are committed to promoting and investing in coordinated and collaborative efforts that generate scientific knowledge to support both the Delta Plan and the objectives identified in the 2009 Delta Reform Act. This commitment has been expressed through DPIIC’s endorsement and acceptance of the Interim Science Action Agenda (2014), the High-Impact Science Actions (2015), and the Science Action Agenda (2017); documents that identify and prioritize collaborative science efforts. In endorsing the Delta Science Plan, we accept the document as a shared guide to build the collaborative science community and support efforts to work together in carrying out integrated actions that achieve the vision of One Delta, One Science.

Delta smelt resiliency strategy

California Department of Water Resources (DWR) | July 11th, 2016

The Delta Smelt Resiliency Strategy (Strategy) is a science-based document that has been prepared by the State of California (State) to voluntarily address both immediate

The Delta Smelt Resiliency Strategy (Strategy) is a science-based document that has been prepared by the State of California (State) to voluntarily address both immediate and near-term needs of Delta Smelt, to promote their resiliency to drought conditions as well as future variations in habitat conditions. The Strategy relies on the MAST Report and Conceptual Models (IEP 2015) to articulate a suite of actions that can be implemented in the next few years that are intended to benefit Delta Smelt. Although the feasibility and effectiveness of each action included in the Strategy requires further exploration and study, the Strategy is an aggressive approach to implementing any actions that can be implemented in the near term, can be implemented by the State with minimal involvement of other entities, and have the potential to benefit Delta Smelt. State agencies that could implement this Strategy include Department of Water Resources (DWR), Department of Fish and Wildlife (DFW), and Division of Boating and Waterways (DBW). Several of the actions identified in this Strategy could also benefit other species, and coordination across various resource management agencies as appropriate may allow for benefits beyond Delta Smelt. All of the actions will be in compliance with applicable laws, including the Federal Endangered Species Act, California Endangered Species Act, California Environmental Quality Act, National Environmental Policy Act, and the Federal Clean Water Act. The Collaborative Science and Adaptive Management Program (CSAMP) will be used to determine the appropriate research approach to designing and assessing the outcomes of these management actions individually and synergistically. Additionally, it is expected that the Bureau of Reclamation (Reclamation) would participate in the implementation of this Strategy, including providing enhanced outflows in 2016.