New to CAST?

Register to create and edit scenarios for reducing nitrogen, phosphorus, and sediment with varying best management practices to streamline environmental planning. Registration also includes access to additional data, tools and resources including CAST's monthly newsletter.

CAST is back online after successful updates. For those users who access NEIEN, the NEIEN node at the Bay Program is still being worked on and remains temporarily offline. We apologize for the inconvenience.


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.