Images

The Water Isotope Network precipitation collector at U.S. Geological Survey site 395811105480401 Devils Thumb Meteorological Station near Fraser, Colorado, in September 2020.

The Captain Jack site is located in mountainous terrain northwest of Boulder, Colorado. Here the terrain is visible behind an old train track leading into a mine adit.

Location: Captain Jack Superfund site, Boulder County, Colorado

Image of a streamflow measurement site on Fountain Creek near Manitou Springs, Colorado.

Interactions between water and minerals in the subsurface (including efflorescent sulfate salts and calcite such as this sample from the Big Five adit) are a primary control on water quality in mining environments. Research is evaluating the importance of these minerals in generating acid mine drainage.

Real-Time Kinematic Global Navigation Satellite Systems (GNSS) surveying equipment near Non-Potable Reservoir 1

Ice Lake at dusk, looking north from the main outlet structure

Research vessel with bathymetric surveying equipment Non-Potable Reservoir 2

Research vessel with bathymetric surveying equipment andU.S. Geological Survey hydrologist on Kettle Lake 3.

Looking southwest from the north side of Kettle Lake 2

Image of North Taylor Creek in Wet Mountain Valley, Colorado prior to completion of a surface-water discharge measurement.

Photo of equipment for slug test at aquifer testing site in Colorado. The Rocky Mountains are visible in the background.

Tony Carson, with the Colorado Water Science Center, pays careful attention to detail as he records flume measurements. 

Two synoptic sampling campaigns were conducted near Breckenridge, Colorado, to quantify metal loading to Illinois Gulch, a tributary of the Blue River.

A microscopic picture of a Dytiscus insect from the AXL lab at the Fort Collins Science Center. 

USGS research vessel with Teledyne Odom Hydrographic ES3PT–M integrated multibeam echo sounder and motion sensor submerged on the port side, and Trimble SPS461 GPS receivers mounted on each side of vessel.

USGS research vessel collecting bathymetry data at Clear Creek Reservoir.

Animas River downstream from Silverton, Colorado, showing right and left bank areas where streambed sediment sample was collected near USGS stream gage at site A72 (USGS site ID 09359020). Latitude 37.789964, Longitude -107.667394.

North Fork Cement Creek showing visual results of sodium hydroxide (NaOH) addition which increases the pH causing  precipitation of ferric (orange) and ferrous (green) iron hydroxides.  Latitude 37.89517, Longitude -107.64656.

Animas River downstream from Silverton, Colorado, showing streambed sediment collected from right bank backwater area in scoop, and from left bank cobble area (in jar) near USGS stream gage at site A72 (USGS site ID 09359020). Latitude 37.789964, Longitude -107.667394.

Measuring pH at the outlet of the fourth settling pond downstream from the North Fork Cement Creek. Latitude 37.894451, Longitude -107.64763.

USGS stream Gage (USGS site ID 09358000) on Animas River upstream from Silverton and Cement Creek. Latitude 37.811131, Longitude -107.659213.