National Weather Service Advanced Hydrologic Prediction Service

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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office Seattle, WA

Northwest River Forecast Center

Hydrograph

River at a Glance

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About this graph

Tabular Data (UTC)

Tabular Data (PDT)

Datum: Not Available

Metadata

NOTE: River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Issaquah Creek near Issaquah are issued routinely year-round.

Return to Area Map

Flood Categories (in KCFS)

Major Flood Flow:	2.8
Moderate Flood Flow:	2.3
Flood Flow:	2
Action Flow:	1.34
Low Stage (in feet):	0

Historic Crests
(1) 3,200 cfs on 01/09/1990
(2) 3,100 cfs on 11/24/1986
(3) 2,870 cfs on 12/03/1975
(4) 2,620 cfs on 02/06/2020
(5) 2,450 cfs on 01/08/2009
(6) 2,420 cfs on 02/08/1996
(7) 2,410 cfs on 11/24/1990
(8) 2,330 cfs on 01/25/1984
(9) 2,300 cfs on 01/19/1986
(10) 2,260 cfs on 02/28/1972
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 2,110 cfs on 03/01/2022 (P)
(2) 1,350 cfs on 01/13/2021 (P)
(3) 1,320 cfs on 01/03/2021 (P)
(4) 2,620 cfs on 02/06/2020
(5) 1,290 cfs on 02/01/2020
(6) 1,930 cfs on 12/20/2019
(7) 1,510 cfs on 02/09/2017
(8) 2,010 cfs on 12/09/2015 (P)
(9) 1,460 cfs on 11/14/2015
(10) 1,020 cfs on 01/05/2015
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 10 cfs on 09/29/1994

Zoom Level:16

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
2800	Issaquah Creek will cause severe near record flooding in Issaquah valley. Deep and swift flood waters will inundate residential and business areas and numerous roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Issaquah Creek Basin.
2300	Issaquah Creek will cause major flooding in most of the valley. Deep and swift flood waters will inundate residential and business areas and numerous roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Issaquah Creek Basin.
2000	Issaquah Creek will flood most low areas in the valley. Swift waters will flood residential and business areas and roads including Newport Way.
1200	Issaquah Creek will spill over its banks into low flood prone areas of the valley.

About This Location

Latitude: 47.552500° N, Longitude: 122.046667° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS flow	Not Available	Not Available	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	Not Available	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	35.99 ft	46.49 ft	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	Not Available	Not Available

Current/Historical Observations:

U.S. Geological Survey (USGS) Data and Site Info for Issaquah

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Hydrologic Resources

Additional Resources

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
Seattle Weather Forecast Office
7600 Sandpoint Way NE
Seattle, WA 98115-6349
(206) 526-6087
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Page last modified: 2-Nov-2020 7:27 PM

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