How to use this site

Step 2.

After you have refined your query by the boundary or constraint that you chose in the previous step, you will be given the opportunity to refine your query further. Once you select the primary boundary or constraint, you will be given other dropdown lists that can be selected from (either State, Year, Drainage, or Route Name, based on the initial query). Once you select your desired items in the list (using Ctrl to select multiple items), press the "Next" button to continue to the next list. It may be more effective to refine your results one parameter at a time because it is easy to select items in each of the list that are mutually exclusive