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EPA has recently published a tool called the National Stormwater Calculator that can be used to further analyze the most cost effective BMP options within WRR opportunity sites. Consider integrating your findings from the WRR with the Stormwater Calculator to achieve more meaningful results based on landscape characteristics.

Click here to view an AASHTO sponsored webinar on the WRR presented by members of the Maryland WRR Technical Advisory Committee (TAC).

Link to Map Tool
Link to Map Tool
Link to Map Tool


Welcome to the Watershed Resources Registry, an interactive mapping tool to characterize and prioritize natural resource management opportunities using a Watershed Approach. Areas across Maryland have been scored on a scale of one to five stars based on their potential benefits for restoration or preservation. Users can either access the interactive mapping tool or download the data directly.

Using the Watershed Resources Registry allows you to:

  • Identify candidate locations
  • Assess and compare potential projects
  • Export data and print site maps for field visits
After exploring the site or utilizing the mapping tool for watershed information, we welcome your feedback.

Training Video

The Watershed Resources Registry has put together a training video to help teach users how to use the various tools inside the mapping application. Click here to view the training video. An additional video that demonstrates the new “Add Site Visit” functionality can be viewed by clicking here.

Technical Requirements

To use this website we strongly recommend using a high speed internet connection and Google Chrome. Note compatibility view needs to be enabled if running alternate web browsers; functionality will be limited. Additionally, Adobe PDF Reader 9.0 and Adobe Flash Player 10.0 are required. The resolution of your monitor is also important; make sure your resolution is 1024 x 768 or above and assure you have disabled any pop-up blocker utilities while accessing the site..


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