Images

Technicians installed a new cableway on the Columbia River below Priest Rapids Dam at USGS streamgage 12472800. Date unknown.

USGS staff prepare to measure a flooding river from a cableway. The location is likely USGS streamgage 12472800 on the Columbia River below Priest Rapids Dam. 

The steep basalt banks of the Columbia River below Priest Rapids Dam at USGS streamgage 12472800 made for tricky streamflow measurements.

A historical USGS streamgage measured flow through a small river in Washington State. The gagehouse on the right relied on the concrete weir to make flow measurements. The exact date and location are unknown.

A goose wades in front of a USGS streamgage. The staff plate (measuring stick) is visible in front of the small bridge. The exact date and location are unknown.

The USGS monitors streamflow in rivers across the nation year-round. Here, a technician makes notes at a gagehouse on a river in Washington State. The exact date and location are unknown.

A USGS streamgage and cableway situated on a small river in central Washington State. The exact location and date are unknown.

Before/after photographs document the installation of a new USGS gagehouse and cableway in Washington State. The exact date and location are unknown.

Remnant of Villard Glacier is in cirque below. Thick summit lava flow makes up "Glisan Pinnacle," which overlies hundreds of thin rubbly lava flows that are intercalated with red-oxidized agglutinate and scoria falls exposed on 800-m- (2600-ft-) high face below. Flows that form ridge at upper right are thicker than those on most of edifice.

Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.

Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.

Information regarding volume and rates of advance for the crevassed Crater Glacier at Mount St. Helens, Washington, are extracted from Digital Elevation Models created from aerial photography. The red line shows the extent of Crater Glacier in 2012. Since 2012, the glacier has advanced about 50 m (160 ft) down the Loowit channel.

Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.

Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat.

Tiltmeters allowed 24-hour monitoring as the information was telemetered back to CVO. Other instruments such as displacement meters for measuring cracks, seismometers for measuring earthquakes, gas sensors for measuring gas concentrations, and magnetometers for measuring the magnetic field, were also used for 24-hour monitoring.

Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.

Map of horizontal displacement vectors for Global Positioning System (GPS) stations in and around Mount St. Helens. Blue arrows show the direction and magnitude of horizontal movement, as measured at the GPS station from 2008-2014. The total horizontal displacement is indicated in millimeters (mm) and inches (in).

Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.