Images

An open-source image recognition program was used to detect the fish and lures in the videos. The program was “trained” to recognize the fish and lures by exposing it to approximately 800 images of fish and non-fish.

This is a screenshot of the web tool: Legacy Mercury Contamination from Historical Gold Mining.

View of San Francisco from the USGS research vessel. The goal of this study was to identify the reasons for discrepancies between fChl measurements made under different sampling conditions. 

Sample map - Legacy Mercury Contamination in California’s Sierra Nevada. This map show locations of remediation efforts.

Historical photo of the Malakoff Diggins hydraulic gold mine in the Sierra Nevada in California. 

This is a photo of a Sierran Treefrog (Pseudacris sierra). It was one of the taxa sampled in the study: Legacy Mercury Contamination from Historical Gold Mining.

The above photo includes members of the team associated with research done in collaboration with UC Davis. From left to right, Angela DePalma-Dow (Lake County, conference co-organizer), Sergio Valbuena (UC Davis), Charles Alpers (USGS), Alicia Cortes (UC Davis), and Samantha Sharp (UC Davis).  

USGS scientists Dina Saleh, Fred Feyrer, and Charles Alpers stand next to their poster at the 2024 Clear Lake Symposium.

USGS booth at the 2024 Lake Tahoe Summit. Shown are Zachery Hood (left) and Sara Doyle (right) of the Nevada Water Science Center. Also present were Joseph Nawikas of the California Water Science Center and Ramon Naranjo of Nevada. (Photo by Ramon Naranjo.)

Distance shot of crown gathered for the 2024 Lake Tahoe Summit. Lake Tahoe Summit attendees listen to opening remarks from U.S. Senator Catherine Cortez Masto from Nevada.

Mount San Jacinto after some winter storms and the windmills. Mount San Jacinto forms the southern border of the San Gorgornio Pass in California.

The figure shows the locations of the San Gorgonio Pass groundwater monitoring network and planned well sites.

Lilium pardalinum, or California Tiger Lillies, found along Squirrel Creek in the Plumas National Forest.

Soil moisture sensors positioned in pit at different depths. Inset: close-up of sensor showing the two probes that gather the data.

USGS team in front of Squirrel Creek monitoring station in California's Plumas National Forest.

USGS scientists attaching solar panel and antennae to soil moisture response unit.

Lilium pardalinum, or California Tiger Lillies, found along Squirrel Creek in the Plumas National Forest.

A team member helps dig the pit for the soil moisture sensors in the Plumas National Forest in California. Inset: close-up of soil removed from Squirrel Creek pit. 

USGS Hydrologist Jim Howle checks data logging and transmission components using a laptop computer.

Panorama of area near Squirrel Creek soil moisture response unit installation in California's Feather River watershed.

Soil monitoring station installation team, with personnel from USGS and USDA, at Squirrel Creek installation site.