New to CAST?

Rapidly develop scenarios for reducing nitrogen, phosphorus, and sediment with varying best management practices to streamline environmental planning.
Register for increased functionality and to stay updated.

CAST is updated to the CAST-19 version.

These updates change the loads in all scenarios.

Please visit the Upgrades page to learn about these changes. This CAST webinar reviews the changes and how to import scenarios from CAST-17d to CAST-19.


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.


View information on best management practices (BMPs) including calculations, a quick reference guide, and protocol and expert panel reports.

Map Tools & Spatial Data

View geographical information and shapefiles.


Download BMP costs data and view cost profiles for each state and Chesapeake Bay Watershed.

Track Progress

View helpful information on verification, river trends, how to submit progress data via NEIEN, and modeling Federal facilities.