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Development and Research: Tracer Tests

Locating inflows and springs discharging into a stream.
Locating inflows and springs discharging into Mineral Creek, Colorado, prior to conducting a tracer test. Tracer tests are used to assess the relative magnitude of metal loading from inflows along a stream reach.

A USGS scientist and continuous water-quality sampling equipment on the banks of a stream.
USGS scientist at a site of continuous water-quality sampling during a tracer test conducted on the North Fork of the Animas River, Colorado.

View of a data logger used to control a pump.
View of a data logger used to control a pump that injects a tracer solution into a stream during a stream tracer test.

USGS equipment trailer -- bringing tracer tests to Rocky Mountain streams.
USGS equipment trailer -- bringing tracer tests to Rocky Mountain streams.

USGS scientist spacing sampling points along a stream.
Spacing sampling points along a stream prior to a tracer test on Mineral Creek, Colorado.

USGS scientists filling a holding tank with a tracer solution.
Filling a holding tank with a tracer solution prior to the start of a stream tracer study, Upper Animas River Watershed, Colorado.

View of the setup of a NaCl tracer test.
View of the setup of a NaCl tracer test that was designed to determine natural attenuation of metals in Pinal Creek, Arizona.

Downstream view of Pinal Creek, Ariz.
Downstream view of Pinal Creek, Arizona, where a tracer solution was injected into the stream during a tracer test. Water-quality sampling crews can be seen in the distance.

 

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Page Last Modified: Wednesday, 07-May-2014 14:55:49 EDT