Rod Meredith provided this link to proposed revisions to Clean Water Act regulations that are applicable to Waters of the United States (WOTUS). These proposed regulations should be of interest to County staff dealing with design and/or operations.
https://www.federalregister.gov/documents/2021/12/07/2021-25601/revised-definition-of-waters-of-the-united-states
Colorado Association of Road Supervisors and Engineers (CARSE)
CARSE