Skip to main content
King County logo
This page provides links to current hydrologic information available over the internet for King County and vicinity. Included are links to both internal King County sites, as well as external agency sites which King County has no direct involvement and which King County provides no warranty for the content or availability of these sites. We encourage the users of this page to propose new sites and to notify us of problems with this page. Please forward any suggestions to the KC Hydrologist.
Joint service by City of Seattle, King County, and Washington State Department of Transportation providing regional weather and traffic information.
NWS Forecast Center with links to observed data and forecasts.
University of Washington Atmospheric Sciences - Forecasts, Observations, Models.
Current streamflow conditions for King County and Washington State.
USACOE webpage which includes links to observed streamflow and reservoir data.
Data, Forecasts, News, Maps, Imagery.
Links to sources of online environmental data collected in King County.
Local Weather Forecast for Seattle, King County and Vicinity. See also, NWS Forecast Table.
Recent daily weather observations for Sea-Tac Airport.
Displays the daily total precipitation (updated approximately every 4 – 8 weeks) as recorded at Sea-Tac by the National Weather Service.
Current condtion snowpack information compiled from SNOTEL sites. Scroll to view local watersheds.
Comprehensive list of meteorological data and forecast information.
NOAA National Environmental Satellite, Data, and Information Service.
Alternate source for Seattle Weather, as observed at Sea-Tac airport.
Four phase warning system for the major river systems of King County. Current flow data obtained from USGS.
Table of USGS real-time observed streamflows for rivers in King County.
Map oriented search for USGS gauge sites, including the major river systems of King County.
Washington State current condition streamflows reatlvie to historical low flow conditions.
On June 30, 2003 the Department of Ecology (Ecology) approved a proposal to help supply the long-range municipal water needs of the Central Puget Sound region, protect salmon and assist ongoing efforts to preserve Lake Tapps.
King County links to drought and water supply information Web sites.
USGS resevoir elevation data Web site.
King County's Flood Information Page - with information on flood warnings, flood hazard maps, road closures, precipitation data, and hints to help you prepare for floods and winter storms.
King County's Lakes Page - with descriptions of the various lake monitoring and lake management programs that King County staff are involved in.
King County's Wastewater Treatment Division Home Page
Current and forecasted conditions for I-90 across Snoqualmie Pass
Multi-jurisdictional Web site of stream benthic macroinvertebrate data in the Puget Sound region