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Protecting Water Quality Starts with Science

USGS hydrologist prepares a profiler to sample water quality in Brownlee Reservoir
USGS hydrologist prepares a profiler to sample water quality in Brownlee Reservoir

From the Coeur d'Alene River basin in the panhandle to the Idaho National Laboratory in the southeast, we work with Federal, state, local, tribal, and private sector partners to monitor and study the quality of Idaho's water resources.

We also provide real-time water-quality data from monitoring sites throughout Idaho.


Monthly Hydrologic Update

June 2016 Idaho Hydrologic Update

Our monthly Idaho Hydrologic Update helps you stay informed about Idaho's water resources. Each month, we summarize significant findings from our hydrologic data networks; announce new studies; and let you know how we support our local, state, Federal, and tribal partners with reliable, unbiased science.

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Browse previous updates.

Current Streamflow Conditions

Today's streamflow conditions. Click to see more real-time data.

Centennial Streamgages

More than two dozen Idaho streamgages offer more than 100 years of water data. Click the Centennial Streamgage badge below to access data from these streamgages.


Idaho's centennial streamgages with more than 100 years of recorded data

Latest Publications

Mercury cycling in the Hells Canyon Complex of the Snake River, Idaho and Oregon

Report cover. Click to read report.

Elevated concentrations of mercury and methylmercury have been found in the water, sediments, and fish of the Snake River as it flows through the three-reservoir Hells Canyon Complex along the Idaho-Oregon border. Scientists from the USGS and Idaho Power Company are intensively studying the processes of mercury cycling in the Hells Canyon Complex to inform decision-making about reservoir operations.

Groundwater-flow model for the Wood River Valley aquifer system, south-central Idaho

Report cover. Click to read report.

USGS and Idaho Department of Water Resources hydrologists collaboratively developed a new groundwater-flow model for the Wood River Valley aquifer system. With the model, resource managers can simulate how increased or decreased pumping from the aquifer system or changes in precipitation and climate would affect groundwater levels and area streams.