This data release documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the North Delta, Central Delta, and the Western Delta out to Suisun Bay in the Sacramento-San Joaquin River Delta of California, USA. Descriptions for each document and file are listed below: 1. METHODS: (Methods LandingPage.pdf) - Text document describing methods used for data and sample collection and analysis. 2. META DATA: (Assessing spatial variability of nutrients and related water quality constituents in California Sacramento San Joaquin Delta High resolution mapping surveys.xml) - Full metadata for the landing page of ''Assessing spatial variability of nutrients and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: High resolution mapping surveys.'' ; 3. INSTRUMENT SET UP: (DRMP Instrumentation.png) - Image showing set up of the instrumentation used for mapping.