Images

GeoGirls analyze volcanic sediment at the Coldwater Lake outlet.

GeoGirls take core samples at a pond near the Hummocks Trail to study groundwater transport.

Lost River suckers congregating to spawn on Sucker Springs in Upper Klamath Lake, Oregon.

The choice when issuing earthquake warnings is to: 1) issue alerts for weak shaking and potentially provide long warning times, but risk sending alerts for the many events that do not go on to produce damaging ground shaking, or 2) issue alerts only when ground shaking is expected to be damaging, with the tradeoff that the alert will be sent much later, reducing

Variability associated with streamflow permanence predictions

Stream observation points and focal basins for PROSPER project

Mean Annual Streamflow Permanence Probability

Horizontal displacements from campaign (black vectors) and continuous (red vectors, with station names given) GPS stations, as well as vertical displacements (indicated by color of GPS station symbol) near South Sister, Oregon. Length of arrow gives amount of horizontal displacement, with scale in lower left showing an arrow length

The Alsea River in the Oregon Coast Range

Scientists from the U.S. Geological Survey and Idaho Power Company collected water, sediment, and biological samples from Brownlee Reservoir as part of an ongoing, cooperative study of mercury cycling in the Hells Canyon complex of reservoirs along the Snake River bordering Idaho and Oregon.

The Snake River is the largest tributary of the Columbia River. It drains over 108,000 square miles in mainly Idaho and portions of Montana, Nevada, Oregon, Washington, and Wyoming. The climate of much of the Snake River watershed is arid or semi-arid and spring snowmelt contributes substantially to the river’s flow.

GeoGirls collect water samples and flow measurements to model the transport of volcanic sediments.

As blooms of cyanobacteria die on the water surface of Upper Klamath Lake they turn blue-green.

USGS studies the behavior and health of juvenile endangered Lost River and shortnose suckers within in-lake mesocosms in Upper Klamath Lake, Oregon.

Columbia River mouth bathymetry from USGS data release

Looking out over a red alder forest with evergreen trees at Cascade Head Preserve in Oregon.

USGS scientist conducts sediment trap deployment in Hells Canyon Reservoir in the Snake River on the Idaho-Oregon border.

Klamath Falls Field Station staff maintain remote Passive Integrated Transponder (PIT) detection system on Upper Klamath Lake, Oregon.

This remote area along the southern Idaho-Oregon border was affected by the 2015 Soda Fire, which burned nearly 400 square miles of sagebrush habitat important to many species of wildlife, as well as federal and private ranchlands.

GeoGirls hike onto the Pumice Plain to learn more about Mount St. Helens’ historical

eruptions.

High-resolution digital elevation dataset for Newberry Volcano and vicinity, Oregon, based on lidar survey of August-September, 2010 and bathymetric survey of June, 2001.