Office of Coast Survey – Page 2

August 1, 2025

Charting the Yukon River as it freezes and thaws

NOAA’s Office of Coast Survey just released major updates to the official navigational charts of the Yukon River—a vital waterway serving many interior communities of Alaska. The Yukon is frozen more than half the year, limiting the window for barges to deliver the fuel, building materials, heavy equipment, and other supplies that cannot be transported by air. NOAA has developed a new process for updating the Yukon charts with the most current shoreline information, which is expected to improve safety and efficiency of navigation on the river and make delivery of vital supplies more reliable.

July 25, 2025August 13, 2025

Surveying the Kuskokwim River, Alaska’s Most Dynamic Waterway

A black U.S. Coast Guard ship, with "U.S. COAST GUARD" written in white on its side and the number "208" on its stern, is docked at a wooden pier. The ship has an orange and white superstructure. In the background, snow-capped mountains rise under a cloudy sky. The water in the foreground is calm.

Alaska’s Kuskokwim River is both unpredictable and essential. Shifting sandbars, variable tides, and seasonal ice dramatically reshape the waterway, requiring frequent updates to the navigational channel. It remains a lifeline for communities like Bethel, Alaska. NOAA’s Coast Pilot describes the waterway as a “maze of shifting sandbars…and blind channels” with navigation conditions that can change daily.

Currently, the U.S. Coast Guard maintains over 50 aids to navigation, or ATONs, along the river to guide vessels. Mariners use these ATONs to travel safely through the channels. The Coast Guard Cutter Aspen requested support from NOAA to provide updated bathymetric data to help them to validate and adjust ATONs–a mission critical function to ensure safe navigation for vessels traversing one of the state’s most dynamic and economically vital waterways.

June 13, 2025June 13, 2025

NOAA releases Long Island Sound survey data to support electric power cable planning

We are pleased to announce the availability of new seafloor mapping data to support energy infrastructure planning in the Long Island Sound!

This survey is the result of a Coast Survey partnership with the Connecticut Department of Energy and Environmental Protection (CTDEEP) through NOAA’s Brennan Ocean Mapping Fund opportunity, a program that allows non-federal organizations to co-fund projects of mutual interest utilizing NOAA’s contracting and data management expertise. NOAA selected this project in the FY2024 round of the matching fund opportunity.

June 4, 2025June 6, 2025

Coast Survey’s Operational Forecast System informs shipwreck oil spill scenarios

During World War II, the 334-foot, 5,350-ton SS Coast Trader was hit by a torpedo and sank off the coast of Cape Flattery, Washington.

Resting almost 500 feet below the surface, the Coast Trader has an estimated 542 tons of heavy fuel oil remaining in the fuel tanks. The quantity onboard the Coast Trader is equivalent to 60% of the volume of fuel spilled into the Pacific Ocean near Grays Harbor by the barge Nestucca in 1988, which remains one of Washington’s largest and most damaging oil spills.

March 28, 2025

The Interagency Working Group on Ocean and Coastal Mapping announces progress on mapping U.S. ocean, coastal, and Great Lakes waters

The federal Interagency Working Group on Ocean and Coastal Mapping recently released the sixth annual report on progress made in mapping U.S. ocean, coastal, and Great Lakes waters. To safeguard our national security and economic prosperity, ocean mapping, exploration, and characterization is foundational to maritime commerce, domestic energy and seafood production, tourism and recreation, and understanding of our natural resources, among other interests. The 2020 National Strategy for Mapping, Exploring, and Characterizing the United States Exclusive Economic Zone (NOMEC) makes comprehensive ocean mapping a priority for the coming decade. The Unmapped U.S. Waters report tracks progress toward these important goals.

March 24, 2025March 31, 2025

Ancient river systems, glacial grooves, and steep cliffs discovered near Cape Fear, North Carolina

An image of NOAA Ship Ferdinand R. Hassler.

A View into the History of the Cape Fear Region–Tens of Thousands of Years into the Past

By Cmdr. William Winner

Over the spring and summer of 2024, NOAA Ship Ferdinand R. Hassler surveyed an area southeast of Cape Fear, North Carolina. This area is unique to the East Coast of the United States—whereas most of the East Coast’s seabed is sandy and has large areas of sand waves, this area does not have as much deep sand cover and instead features exposed underlying bedrock.

March 14, 2025February 18, 2026

Coast Survey responds to the D.C. midair collision: a timeline

Four images: the first is an uncrewed surface vehicle on the Potomac River, and the three following are different NOAA Corps officers and civilians conducting hydrographic surveying.

On January 29, 2025, a commercial jetliner and a U.S. Army helicopter collided in midair over the Potomac River, near Washington’s Ronald Reagan National Airport. On February 2, the U.S. Coast Guard and District of Columbia Fire Department requested NOAA Coast Survey’s expertise in hydrographic surveying in order to locate wreckage from the incident using multibeam and side scan sonar technology. Once Coast Survey arrived, the incident command team turned over virtually all survey operations, particularly in the shallow water debris field, to our field units.

February 11, 2025

NOAA’s 2025 hydrographic survey season is gearing up and will be underway soon

An image showing a red uncrewed surface vessel and NOAA Ship Thomas Jefferson on Lake Erie in the vicinity of Cleveland, Ohio

The winter months represent an end to NOAA’s active survey season. During this period, hydrographic survey ships, navigation response team survey vessels, and contractor teams and vessels undergo maintenance and repair in anticipation of the upcoming survey season. NOAA’s 2025 survey season will begin soon as planned survey projects go through the planning and development process and begin to filter to the forefront of each field party’s focus. The ships and survey vessels collect bathymetric data (i.e. map the seafloor) to support nautical charting, modeling, and research, but also collect other environmental data to support a variety of ecosystem sciences. NOAA considers hydrographic survey requests from stakeholders such as marine pilots, local port authorities, the Coast Guard, and the boating community, and also considers other hydrographic and NOAA science priorities in determining where to survey and when. Visit our “living” ArcGIS StoryMap to find out more about our mapping projects and if a hydrographic vessel will be in your area this year!

February 6, 2025June 12, 2025

Office of Coast Survey 2024 Year in Review

A group of images showing various activities undertaken by the Office of Coast Survey throughout the course of 2024.

As we look ahead to continued progress in 2025, NOAA’s Office of Coast Survey is proud to share some highlights of the past year with you. We mounted successful emergency responses to reopen ports quickly and safely after hurricanes and a bridge collapse; completed a five-year process to transition to fully electronic navigational chart production; provided hands-on learning experiences for students aboard NOAA Ship Nancy Foster; and much more, all in service of delivering authoritative ocean and lakebed mapping information as the nation’s chartmaker.

December 18, 2024June 20, 2025

NOAA updates bridge clearances crossing one of the most important waterways in the United States

An image showing the Crescent City Connection Bridges taken from the left ascending bank of the Mississippi River with the city of New Orleans in the background.

The Port of New Orleans, is one of the largest ports in the United States. It spans both sides of the Mississippi River in the state of Louisiana, with its lower limit situated approximately 80 miles above the confluence of three major passes used to access the river from the Gulf of Mexico. The city of New Orleans serves as the primary commercial hub within the port’s limits. As one of the largest cities along the Gulf Coast, it is a natural gateway for trade, connecting the vast central and southern regions of the nation, particularly the entire Mississippi River Valley, via numerous inland water routes.