### Question
How is the "ordinary high water mark" defined?


### Answer
The term **ordinary high water mark** is defined in *40 CFR § 300.5* as follows -

> that line on the shore established by the fluctuations of water and indicated by physical characteristics such as a clear, natural line impressed on the bank, shelving, changes in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas.

#### Citation:
  - *40 CFR § 300.5*
  - Heading: **PART 300—NATIONAL OIL AND HAZARDOUS SUBSTANCES POLLUTION CONTINGENCY PLAN > Subpart A—Introduction**

