News Release Manager

Army Corps of Engineers updates High Tide Line data for Alaska

Published April 28, 2017
JOINT BASE ELMENDORF-RICHARDSON – Updated High Tide Line, or HTL, data is now available on the U.S. Army Corps of Engineers-Alaska District website.

The changes reflect HTL information used in identifying the Corps’ jurisdictional limits in tidally influenced waters of the U.S., as defined in the agency’s regulations.

New HTL data was gathered utilizing the National Oceanic Atmospheric Administration Epoch data at

The new tidal data, methods used to calculate HTL and Mean High Water, as well as updated definitions are available on the Corps’ public website at

The Corps is responsible for regulating certain activities in waters of the U.S., including wetlands. Under Section 10 of the Rivers and Harbors Act of 1899, a permit is required for work and/or structures in, over or under navigable waters of the U.S.

Under Section 404 of the Clean Water Act, a permit is required for the discharge of dredged or fill material in all waters of the U.S.

For more information on the extent of the Corps’ regulatory jurisdiction, go to or contact the Corps at (907) 753-2712.

Dena O'Dell

Release no. 17-004