Skip to main content
U.S. flag

An official website of the United States government

Drilling holes in the ice using an ice auger

Detailed Description

Hydrologic technician measured the streamflow of ice-covered rivers in Northern Maine as part of the North Index Trip. Certain gages are considered "Index" sites because they make for good references when comparing discharges of nearby streamgages, especially in frozen conditions. 


Public Domain.