Alaska Tidal Datum Portal

Unambiguous vertical datums in the coastal environment are critical to the evaluation of natural hazard vulnerability in support of local and regional planning. Appropriate tidal data must be considered in the siting, design, construction, and operations of development projects to ensure protection of human life, property, and the coastal environment.

January 2017 - Update Summary
Alaska Tidal Datum Reference Table

Help update the Tidal Datum Portal, improve the National Spatial Reference System, and facilitate public access to Alaska benchmarks by collecting GPS data and making a contribution to the shared Online Positioning User Service (OPUS) database.

2017 list of tide stations in need of GPS benchmark observations

The development of this site was partially funded with qualified outer continental shelf oil and gas revenues by the Coastal Impact Assistance Program, Fish & Wildlife Service, and U.S. Department of the Interior. The views and conclusions contained herein are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. government.