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Boise River at Boise, ID (BIGI1)


Data Type




Inundation Flows

34,800 cfs*
29,000 cfs*
23,900 cfs*
20,000 cfs*
16,600 cfs*
15,000 cfs*

Major Flooding Begins

13,000 cfs*
11,000 cfs*

Moderate Flooding Begins

Record Crest: 9840 cfs
9,500 cfs
8,400 cfs
7,400 cfs
7,200 cfs
7,000 cfs

Minor Flooding Begins

6,500 cfs

Near Flooding Begins

4,200 cfs
* = Extended rating
Weather Forecast Office Boise, ID Northwest River Forecast Center

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Current Flow:
218 cfs at 11/01/2014 08:45:00 UTC
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Inundation Legend Inundation Legend
USGS Gauge Location Gauge Location

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.

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Map Overlays

Flood Categories (in KCFS)
Major Flood Flow:15
Moderate Flood Flow:11
Flood Flow:7
Action Flow:6.5

Historical Crests
(1) 9,840 cfs on 06/13/1983
(2) 8,350 cfs on 05/31/1998
(3) 8,310 cfs on 05/05/2012
(4) 8,030 cfs on 06/07/1986
(5) 7,630 cfs on 06/29/1982
(6) 7,564 cfs on 06/06/1983
(7) 7,440 cfs on 04/30/2006
(8) 7,300 cfs on 03/27/1997
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(P): Preliminary values subject to further review.

Low Water Records
(1) 42 cfs on 10/26/1983
(2) 109 cfs on 10/22/1985
(3) 110 cfs on 12/29/1988
Show More Low Water Records

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

Site-specific information:
These inundation maps for the Boise River through the City of Boise and Garden City were developed by the U.S. Army Corps of Engineers in partnership with Ada County and Ada City-County Emergency Management. The City of Boise, Garden City, and the Idaho Department of Water Resources also provided technical expertise in the review and production of these maps.

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If you notice any errors in the below information, please contact our Webmaster
16000 Or 13.3 feet, 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 Or 12.5 feet, 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 Or 12.0 feet, flooding over Park Center Boulevard in southeast Boise near the Park Center Pond will occur. 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 Or 11.5 feet, moderate 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 and Municipal Park in east Boise. The water may affect some residential property near the river, but should stay below the level of most residential structures.
8900 Or 11.2 feet, 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. The river will spill over its banks between 45th and 46th Street in Garden City into the warehouse district.
7000 Or 10.2 feet, 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 Or 9.9 feet, large sections of the greenbelt path adjacent to the river will be submerged. Minor flooding may affect portions of Eagle Island.
4000 Or 8.5 feet, water will begin seeping onto low spots on the greenbelt path next to the river especially near bridge underpasses.
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Additional Information Collapse
Flood Flow = 7000 cfs. The latest USGS rating shows this flow now corresponds to a river stage of 10.2 feet when measured at Glenwood Bridge.
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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.
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Page last modified: 15-Jul-2014 6:27 PM
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.