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Flood Season Begins

Flooded highway and rest stop on Salmon Falls Creek near San Jacinto, NNV

Ice jams, rain, and snowmelt have caused flooding on rivers and streams throughout Idaho, eastern Oregon, and northern Nevada. Hydrographers from our Post Falls, Idaho Falls, and Boise field offices responded quickly to collect data and document high-water marks, to repair flooded streamgages, and to install emergency streamgages to provide additional data for emergency response managers.

With this year's abundant snowpack, flooding may occur throughout the spring runoff. You can track flows form any of our real-time streamgages on the web, by subscribing to USGS WaterAlert, or by texting or e-mailing a streamgage station number to the USGS WaterNow service.


Monthly Hydrologic Update

February 2017 Idaho Hydrologic Update

Our monthly Idaho Hydrologic Update enters its second year of keeping you 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.

Download our latest update.

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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

Bull trout (Salvelinus confluentus) telemetry and associated habitat data collected in a geodatabase from the upper Boise River, southwestern Idaho

Report cover. Click to read report.

The Boise River upstream of Arrowrock Dam in southwestern Idaho (including Arrowrock Reservoir) provides habitat for one of the southernmost populations of bull trout. The presence of the species in Arrowrock Reservoir poses implications for dam and reservoir operations. From 2011 to 2014, the Bureau of Reclamation and the U.S. Geological Survey collected fish telemetry data to improve understanding of bull trout distribution and movement in Arrowrock Reservoir and in the upper Boise River tributaries. The U.S. Geological Survey compiled the telemetry (fish location) data, along with reservoir elevation, river discharge, precipitation, and water-quality data in a geodatabase.

Ambient water quality in aquifers used for drinking-water supplies, Gem County, southwestern Idaho, 2015

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The entire population of southwestern Idaho’s Gem County depends on aquifers for its drinking water. The results of our study conducted with Gem County and the Idaho Department of Environmental Quality show that the water in those aquifers is of generally good quality.