Logging in to CAST allows users to rapidly develop scenarios for reducing nitrogen, phosphorus and sediment with varying best management practices to streamline environmental planning. Costs are provided so users may select the most cost-effective practices to reduce pollutant loads.

Log In To Get Started


Updates will be deployed to CAST Tuesday, May 7, 2019 at Noon EST. We will do our best to minimize the amount of time that CAST is unavailable. 


Model Documentation

Find information about the Phase 6 model, its documentation and links to calibration data, model review webinars and files.

Develop A Plan

Get answers to your questions about how to use CAST to develop a plan.

Source Data

Download data tables including information on load sources and agencies, BMPs, animals, geographic references and delivery factors.

River Trends

Scientists calculate flow-adjusted trends in nitrogen, phosphorus and sediment levels to better determine whether pollution has changed over time.

Map Tools, BMPs & Verification

View Geographical Information and Shapefiles, BMPs and Verification information.

Track TMDL Progress

Information on how to submit progress data via NEIEN and view implemenation data on meeting the Chesapeake Bay TMDL.