Centennial Streamgages in Washington State
In 1887 the USGS began monitoring streamflow in the Yakima River at Kiona, WA. The streamgage is still in operation, providing real-time data to inform decision-making and serve the public. The Kiona gage is one of several centennial streamgages in Washington State, locations where USGS recorded data for at least 100 years.
Streamgages enable hydrologists to record stream water levels and streamflow without needing to constantly make direct measurements. The Nation’s water needs have evolved over the past 100+ years and so has much of the technology used to measure water. USGS streamgage monitoring data continues to benefit communities by providing information about flooding, drought, safety, and engineering design.
Long-term records of streamflow are especially prized. Longer records contain information that allows scientists to conduct statistical analyses and examine trends through time. Additionally, streamgages record how often a river has flooded in the past and thus provide information about how frequently flooding might occur in the future. Centennial streamgages are designated as locations where the USGS has monitored rivers and streams for 100 years or more.
Centennial Streamgages in Washington State
Total: 29 centennial gages in Washington
You may view centennial gage locations in the map widget.
Updated: January 2025
Explore historical photos of streamgaging in Washington State
