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Boise River at Eagle Island, ID (EAGI1)


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: 11.54 ft
9,500 cfs
8,300 cfs
7,400 cfs
7,200 cfs
7,000 cfs

Minor Flooding Begins

6,500 cfs

Near Flooding Begins

4,900 cfs
* = Extended rating
Weather Forecast Office Boise, ID Northwest River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Flow:
306 cfs at 10/19/2017 22:45:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
What is UTC time? Map Help

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.

Gauge Information Collapse

Map Overlays

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) 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
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 2,040 cfs on 04/09/2014
(2) 1,520 cfs on 05/21/2013
(3) 8,310 cfs on 05/05/2012
(4) 7,230 cfs on 05/18/2011
(5) 6,180 cfs on 06/11/2010
(6) 6,320 cfs on 06/07/2009
(7) 7,270 cfs on 05/20/2008
(8) 7,440 cfs on 04/30/2006
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.43 ft on 10/05/1989
(2) 4.43 ft on 10/18/1990
(3) 4.43 ft on 10/26/1983
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:
This interactive map depicts fifteen different flow rates of the Boise River from the head of Eagle Island to the Ada-Canyon County Line. The flow model used provides the best analysis of flooding and flood depths that it can. However, high water events are dynamic and flood waters could end up in areas not depicted on the map.

This map is for planning and awareness purposes only and is not the regulatory Flood Insurance Rate Map (FIRM). To check a property's flood designation, place the address in the search query box of the FEMA Flood map located online at: FEMA National Flood Hazard Map.

These inundation maps for the Boise River were developed by the U.S. Army Corps of Engineers in partnership with Ada County Emergency Management. The National Weather Service and U.S. Geological Survey provided technical expertise in the review and production of these maps.

Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
16000 Or 13.8 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 13.0 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.
10500 Or 12.2 feet, 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 11.7 feet, 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. The water may affect some residential property near the river, but should stay below the level of most residential structures.
8900 Or 11.4 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.
7000 Or 10.3 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 10.0 feet, large sections of the greenbelt path adjacent to the river will be submerged. Minor flooding may affect portions of Eagle Island.
4000 Or 8.4 feet, water will begin seeping onto low spots on the greenbelt path next to the river especially near bridge underpasses.
Additional Information Collapse
This is a pseudo gage being used as a place- holder for flood inundation maps on the Boise River for the river reach from the head of Eagle Island to the Ada-Canyon County line. Data from upstream gage BIGI1 is being used to populate observed and forecast data, flood flows and impacts, and historical crest information.
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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: 21-Dec-2016 10:42 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.