Questions about data contact:
David Clow

Additonal Graphs:

• Rhodamine-WT Reservoir Level
• Rhodamine-WT Concentration in stream
• Battery Voltage
• Pump Housing Air Temperature
• Rhodamine-WT Injection Solution temperature
• Pump Revolutions
• All graphs

Discharge, cubic feet per second from surface water station: _____

Discharge, cubic feet per second from tracer
gage: X

Median of all the daily mean discharges for 96 years:

Discharge value of -9 represents invalid or missing data for tracer gage.

U.S. Department of the Interior
U.S. Geological Survey
Colorado Water Science Center
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Last Modified:
May 5, 2008

What is the Tracer Gage?

• It is an automated method for measuring streamflow in ice covered streams
• Streamflow is calculated based on the amount of dilution of a tracer that is injected into the stream
• Streamflow is measured three times per day
• It was developed by USGS scientists to measure streamflow in Colorado during winter, when streamflow reported from standard stream gages may be incorrect due to presence of ice in the stream channel
• Funding for development provided by the Colorado Water Conservation Board and USGS