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: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Boise, ID

Northwest River Forecast Center

Hydrograph

River at a Glance

Download

Inundation
Mapping

Printable Image

About this graph

Tabular Data (UTC)

Tabular Data (MDT)

Datum: NAVD88

Metadata

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

NOTE: Forecasts for the Boise River at Boise (Glenwood Bridge) are issued routinely year-round.

Vertical datum height surveyed by the USGS

Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in KCFS)

Major Flood Flow:	15
Moderate Flood Flow:	11
Flood Flow:	7
Action Flow:	6.5
Low Stage (in feet):	-9999

Historic Crests
(1) 9,840 cfs on 06/13/1983
(2) 9,590 cfs on 06/06/2017
(3) 8,350 cfs on 05/31/1998
(4) 8,310 cfs on 05/05/2012
(5) 8,030 cfs on 06/07/1986
(6) 7,630 cfs on 06/29/1982
(7) 7,564 cfs on 06/06/1983
(8) 7,440 cfs on 04/30/2006
(9) 7,340 cfs on 05/06/2019
(10) 7,300 cfs on 03/27/1997
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 2,840 cfs on 06/16/2022
(2) 2,840 cfs on 06/14/2022
(3) 2,270 cfs on 05/22/2021
(4) 1,000 cfs on 04/30/2020
(5) 7,340 cfs on 05/06/2019
(6) 6,520 cfs on 05/28/2018
(7) 9,590 cfs on 06/06/2017
(8) 6,420 cfs on 04/11/2016
(9) 1,770 cfs on 05/19/2015
(10) 2,130 cfs on 03/31/2014
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:13

	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
16000	Major flooding will occur near the river in Boise, Garden City, Eagle, Star, and Caldwell. Some residential areas in low lying areas near the river will be flooded with water entering some houses. A flood of this magnitude has not occurred on the Boise River since 1943. Most of the area within the 100 year flood plain, including many city parks near the river, will be underwater. Debris piling up on bridge crossings will cause additional flood damage.
12000	Flooding will occur in low areas and parkland adjacent to the river in Boise, Garden City, Eagle, Star, and Caldwell. Flooding of low lying residential streets in areas adjacent to the river is likely, especially on portions of Eagle Island. Debris damming on bridges crossing the river will occur and may cause water to spill over the road surfaces leading up to the bridge. Park Center Boulevard in southeast Boise will be flooded near the Park Center Pond.
10500	Flooding over Park Center Boulevard in southeast Boise near the Park Center Pond will occur. Flooding will occur in Municiple Park. Flooding near the river will occur in low areas of Boise, Garden City, Eagle, Star and Caldwell. Portions of Eagle Island will be submerged with flooding of residential property in low lying areas near the river likely. The water should remain below the level of most residential structures, but access in and out of some neighborhoods may be limited by high water.
9500	Flooding of low areas near the river in Boise, Garden City, Eagle, Star, and Caldwell will occur. Debris in the river will collect on bridges crossing the river. Water will cover portions of Warm Springs Golf Course in east Boise. The water may affect some residential property near the river, but should stay below the level of most residential structures. The river will spill over its banks between 45th and 47th Street in Garden City into the warehouse district.
8900	Large sections of the green belt will be submerged and severe bank erosion will occur. Flooding will occur in low areas close to the river in Boise, Garden City, Eagle and Caldwell, but the water should remain below the level of most residential areas. Water will seep into the Garden City warehouse district between 45th and 47th streets. Flooding will impact portions of Marianne Williams Park in east Boise.
8200	Large sections of the green belt will be submerged and severe bank erosion will occur. Flooding will occur in low areas close to the river in Boise, Garden City, Eagle and Caldwell, but the water should remain below the level of most residential areas. Water will begin seeping into the Garden City warehouse district between 45th and 47th streets.
7000	Large sections of the greenbelt path adjacent to the river will be submerged. Erosion of river banks will also become a significant problem. Debris in the river including small trees and logs may begin piling up at bridge crossings. Minor flooding will be observed on sections of Eagle Island and in other low spots near the river. Minor flooding will spread downstream to low areas near the river in Star and Caldwell.
6500	Large sections of the greenbelt path adjacent to the river will be submerged. Minor flooding may affect portions of Eagle Island.
5500	Water will cover low sections of the greenbelt path and Bethine Church River Trail adjacent to the river.
4000	Water will begin seeping onto low spots on the greenbelt path next to the river especially near bridge underpasses, and onto portions of the Bethine Church River Trail.

About This Location

Latitude: 43.660556° N, Longitude: 116.279167° 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	Not Available	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	2600 ft	2610.4 ft

Current/Historical Observations:

U.S. Geological Survey (USGS) Data and Site Info for Boise (Glenwood Bridge)

Resources

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
Boise Weather Forecast Office
NIFC Building 3807
Boise, ID 83705-5354
(208) 334-9860
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Page last modified: 2-Nov-2020 7:28 PM

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