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Hydrograph River at a Glance Download Inundation
Mapping
Boise River at Eagle Island River Discharge (cfs)Flow (cfs)Observed: 3891 cfs at 8:00PM Apr 21, 2024Observed: 3878 cfs at 8:15PM Apr 21, 2024Observed: 3891 cfs at 8:30PM Apr 21, 2024Observed: 3904 cfs at 8:45PM Apr 21, 2024Observed: 3865 cfs at 10:00PM Apr 21, 2024Observed: 3891 cfs at 10:15PM Apr 21, 2024Observed: 3865 cfs at 10:30PM Apr 21, 2024Observed: 3904 cfs at 10:45PM Apr 21, 2024Observed: 3891 cfs at 11:15PM Apr 21, 2024Observed: 3865 cfs at 11:30PM Apr 21, 2024Observed: 3904 cfs at 11:45PM Apr 21, 2024Observed: 3917 cfs at 12:00AM Apr 22, 2024Observed: 3878 cfs at 12:15AM Apr 22, 2024Observed: 3929 cfs at 12:30AM Apr 22, 2024Observed: 3878 cfs at 12:45AM Apr 22, 2024Observed: 3839 cfs at 1:00AM Apr 22, 2024Observed: 3891 cfs at 1:15AM Apr 22, 2024Observed: 3865 cfs at 1:30AM Apr 22, 2024Observed: 3852 cfs at 1:45AM Apr 22, 2024Observed: 3878 cfs at 2:00AM Apr 22, 2024Observed: 3852 cfs at 2:15AM Apr 22, 2024Observed: 3878 cfs at 2:30AM Apr 22, 2024Observed: 3878 cfs at 2:45AM Apr 22, 2024Observed: 3865 cfs at 4:00AM Apr 22, 2024Observed: 3852 cfs at 4:15AM Apr 22, 2024Observed: 3891 cfs at 4:30AM Apr 22, 2024Observed: 3865 cfs at 4:45AM Apr 22, 2024Observed: 3852 cfs at 5:00AM Apr 22, 2024Observed: 3865 cfs at 5:15AM Apr 22, 2024Observed: 3826 cfs at 5:30AM Apr 22, 2024Observed: 3904 cfs at 5:45AM Apr 22, 2024Observed: 3917 cfs at 6:00AM Apr 22, 2024Observed: 3891 cfs at 6:15AM Apr 22, 2024Observed: 3865 cfs at 6:30AM Apr 22, 2024Observed: 3891 cfs at 6:45AM Apr 22, 2024Observed: 3878 cfs at 7:00AM Apr 22, 2024Observed: 3865 cfs at 7:15AM Apr 22, 2024Observed: 3878 cfs at 7:30AM Apr 22, 2024Observed: 3865 cfs at 7:45AM Apr 22, 2024Observed: 3852 cfs at 8:00AM Apr 22, 2024Observed: 3826 cfs at 8:15AM Apr 22, 2024Observed: 3865 cfs at 8:30AM Apr 22, 2024Observed: 3865 cfs at 8:45AM Apr 22, 2024Observed: 3878 cfs at 9:00AM Apr 22, 2024Observed: 3904 cfs at 9:15AM Apr 22, 2024Observed: 3813 cfs at 9:30AM Apr 22, 2024Observed: 3878 cfs at 9:45AM Apr 22, 2024Observed: 3865 cfs at 11:00AM Apr 22, 2024Observed: 3878 cfs at 11:15AM Apr 22, 2024Observed: 3878 cfs at 11:30AM Apr 22, 2024Observed: 3891 cfs at 11:45AM Apr 22, 2024Observed: 3955 cfs at 2:00PM Apr 22, 2024Observed: 3981 cfs at 2:15PM Apr 22, 2024Observed: 3942 cfs at 2:30PM Apr 22, 2024Observed: 3981 cfs at 2:45PM Apr 22, 2024Observed: 3968 cfs at 3:00PM Apr 22, 2024Observed: 3955 cfs at 3:15PM Apr 22, 2024Observed: 3981 cfs at 3:30PM Apr 22, 2024Observed: 3981 cfs at 3:45PM Apr 22, 2024Observed: 3955 cfs at 4:00PM Apr 22, 2024Observed: 3994 cfs at 4:15PM Apr 22, 2024Observed: 3955 cfs at 4:30PM Apr 22, 2024Observed: 3955 cfs at 4:45PM Apr 22, 2024Observed: 3955 cfs at 5:00PM Apr 22, 2024Observed: 3968 cfs at 5:15PM Apr 22, 2024Observed: 3968 cfs at 5:30PM Apr 22, 2024Observed: 3942 cfs at 5:45PM Apr 22, 2024Observed: 3904 cfs at 6:00PM Apr 22, 2024Observed: 3942 cfs at 6:15PM Apr 22, 2024Observed: 3942 cfs at 6:30PM Apr 22, 2024Observed: 3955 cfs at 6:45PM Apr 22, 2024Observed: 3929 cfs at 8:00PM Apr 22, 2024Observed: 3968 cfs at 8:15PM Apr 22, 2024Observed: 3994 cfs at 8:30PM Apr 22, 2024Observed: 3955 cfs at 8:45PM Apr 22, 2024Observed: 3942 cfs at 9:00PM Apr 22, 2024Observed: 3929 cfs at 9:15PM Apr 22, 2024Observed: 3955 cfs at 9:30PM Apr 22, 2024Observed: 3968 cfs at 9:45PM Apr 22, 2024Observed: 3968 cfs at 10:00PM Apr 22, 2024Observed: 3942 cfs at 10:15PM Apr 22, 2024Observed: 3981 cfs at 10:30PM Apr 22, 2024Observed: 3981 cfs at 10:45PM Apr 22, 2024Observed: 3942 cfs at 11:15PM Apr 22, 2024Observed: 3981 cfs at 11:30PM Apr 22, 2024Observed: 3981 cfs at 11:45PM Apr 22, 2024Highest Observation: 4007 cfs at 12:00AM Apr 23, 2024Observed: 3981 cfs at 12:15AM Apr 23, 2024Highest Observation: 4007 cfs at 12:30AM Apr 23, 2024Observed: 3981 cfs at 12:45AM Apr 23, 2024Observed: 3955 cfs at 1:00AM Apr 23, 2024Observed: 3929 cfs at 1:15AM Apr 23, 2024Observed: 3981 cfs at 1:30AM Apr 23, 2024Observed: 3955 cfs at 1:45AM Apr 23, 2024Observed: 3955 cfs at 3:00AM Apr 23, 2024Observed: 3968 cfs at 3:15AM Apr 23, 2024Observed: 3981 cfs at 3:30AM Apr 23, 2024Highest Observation: 4007 cfs at 3:45AM Apr 23, 2024Observed: 3981 cfs at 5:00AM Apr 23, 2024Observed: 3968 cfs at 5:15AM Apr 23, 2024Observed: 3968 cfs at 5:30AM Apr 23, 2024Observed: 3968 cfs at 5:45AM Apr 23, 2024Observed: 3917 cfs at 7:00AM Apr 23, 2024Observed: 3955 cfs at 7:15AM Apr 23, 2024Observed: 3955 cfs at 7:30AM Apr 23, 2024Observed: 3981 cfs at 7:45AM Apr 23, 2024Observed: 3981 cfs at 8:00AM Apr 23, 2024Observed: 3981 cfs at 8:15AM Apr 23, 2024Observed: 3968 cfs at 8:30AM Apr 23, 2024Observed: 3955 cfs at 8:45AM Apr 23, 2024Observed: 3981 cfs at 9:00AM Apr 23, 2024Observed: 3981 cfs at 9:15AM Apr 23, 2024Observed: 3955 cfs at 9:30AM Apr 23, 2024Observed: 3994 cfs at 9:45AM Apr 23, 2024Observed: 3942 cfs at 10:00AM Apr 23, 2024Observed: 3968 cfs at 10:15AM Apr 23, 2024Observed: 3955 cfs at 10:30AM Apr 23, 2024Observed: 3917 cfs at 10:45AM Apr 23, 2024Observed: 3942 cfs at 11:00AM Apr 23, 2024Observed: 3955 cfs at 11:15AM Apr 23, 2024Observed: 3955 cfs at 11:30AM Apr 23, 2024Observed: 3929 cfs at 11:45AM Apr 23, 2024Observed: 3942 cfs at 12:00PM Apr 23, 2024Observed: 3942 cfs at 12:15PM Apr 23, 2024Observed: 3981 cfs at 12:30PM Apr 23, 2024Observed: 3917 cfs at 12:45PM Apr 23, 2024Observed: 3942 cfs at 1:00PM Apr 23, 2024Observed: 3942 cfs at 1:15PM Apr 23, 2024Observed: 3955 cfs at 1:30PM Apr 23, 2024Observed: 3942 cfs at 1:45PM Apr 23, 2024Observed: 3929 cfs at 2:00PM Apr 23, 2024Observed: 3968 cfs at 2:15PM Apr 23, 2024Observed: 3929 cfs at 2:30PM Apr 23, 2024Observed: 3981 cfs at 2:45PM Apr 23, 2024Observed: 3968 cfs at 3:00PM Apr 23, 2024Observed: 3929 cfs at 3:15PM Apr 23, 2024Observed: 3955 cfs at 3:30PM Apr 23, 2024Observed: 3942 cfs at 3:45PM Apr 23, 2024Observed: 3942 cfs at 4:00PM Apr 23, 2024Observed: 3942 cfs at 4:15PM Apr 23, 2024Observed: 3942 cfs at 4:30PM Apr 23, 2024Observed: 3929 cfs at 4:45PM Apr 23, 2024Observed: 3942 cfs at 6:00PM Apr 23, 2024Observed: 3942 cfs at 6:15PM Apr 23, 2024Observed: 3929 cfs at 6:30PM Apr 23, 2024Observed: 3955 cfs at 6:45PM Apr 23, 2024Observed: 3942 cfs at 7:00PM Apr 23, 2024Observed: 3929 cfs at 7:15PM Apr 23, 2024Observed: 3929 cfs at 7:30PM Apr 23, 2024Observed: 3942 cfs at 7:45PM Apr 23, 2024Observed: 3955 cfs at 8:00PM Apr 23, 2024Observed: 3942 cfs at 8:15PM Apr 23, 2024Observed: 3929 cfs at 8:30PM Apr 23, 2024Observed: 3955 cfs at 8:45PM Apr 23, 2024Observed: 3968 cfs at 9:00PM Apr 23, 2024Observed: 3917 cfs at 9:15PM Apr 23, 2024Observed: 3955 cfs at 9:30PM Apr 23, 2024Observed: 3994 cfs at 9:45PM Apr 23, 2024Observed: 3981 cfs at 10:00PM Apr 23, 2024Observed: 3955 cfs at 10:15PM Apr 23, 2024Observed: 3968 cfs at 10:30PM Apr 23, 2024Observed: 3968 cfs at 10:45PM Apr 23, 2024Observed: 3955 cfs at 11:15PM Apr 23, 2024Observed: 3968 cfs at 11:30PM Apr 23, 2024Observed: 3968 cfs at 11:45PM Apr 23, 2024Observed: 3955 cfs at 1:00AM Apr 24, 2024Observed: 3994 cfs at 1:15AM Apr 24, 2024Observed: 3968 cfs at 1:30AM Apr 24, 2024Observed: 3942 cfs at 1:45AM Apr 24, 2024Observed: 3942 cfs at 2:00AM Apr 24, 2024Observed: 3929 cfs at 2:15AM Apr 24, 2024Observed: 3955 cfs at 2:30AM Apr 24, 2024Observed: 3942 cfs at 2:45AM Apr 24, 2024Observed: 3968 cfs at 3:00AM Apr 24, 2024Observed: 3929 cfs at 3:15AM Apr 24, 2024Observed: 3968 cfs at 3:30AM Apr 24, 2024Observed: 3968 cfs at 3:45AM Apr 24, 2024Observed: 3994 cfs at 4:00AM Apr 24, 2024Observed: 3955 cfs at 4:15AM Apr 24, 2024Observed: 3955 cfs at 4:30AM Apr 24, 2024Observed: 3981 cfs at 4:45AM Apr 24, 2024Observed: 3968 cfs at 5:00AM Apr 24, 2024Observed: 3968 cfs at 5:15AM Apr 24, 2024Observed: 3955 cfs at 5:30AM Apr 24, 2024Observed: 3929 cfs at 5:45AM Apr 24, 2024Observed: 3942 cfs at 8:00AM Apr 24, 2024Observed: 3942 cfs at 8:15AM Apr 24, 2024Observed: 3929 cfs at 8:30AM Apr 24, 2024Observed: 3942 cfs at 8:45AM Apr 24, 2024Highest Observation: 4007 cfs at 9:00AM Apr 24, 2024Observed: 3942 cfs at 9:15AM Apr 24, 2024Observed: 3968 cfs at 9:30AM Apr 24, 2024Observed: 3968 cfs at 9:45AM Apr 24, 2024Observed: 3955 cfs at 10:00AM Apr 24, 2024Observed: 3942 cfs at 10:15AM Apr 24, 2024Observed: 3968 cfs at 10:30AM Apr 24, 2024Observed: 3981 cfs at 10:45AM Apr 24, 2024Observed: 3929 cfs at 4:15PM Apr 24, 2024Observed: 3942 cfs at 4:30PM Apr 24, 2024Observed: 3942 cfs at 4:45PM Apr 24, 2024Observed: 3968 cfs at 5:00PM Apr 24, 2024Observed: 3929 cfs at 5:15PM Apr 24, 2024Observed: 3929 cfs at 5:30PM Apr 24, 2024Observed: 3929 cfs at 5:45PM Apr 24, 2024EAGI1(plotting QRIRZ) Graph Created (7:30PM Apr 24, 2024)ObservedLatest observed value: 3929 cfs at 5:45 PM MDT 24-Apr-2024. Flood Flow is 7 kcfs
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: Not Available
Metadata
Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Boise River at Eagle Island are issued routinely year-round.

Return to Area Map
Upstream Locations Upstream Gauge Downstream Gauge Downstream Locations
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
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 7,340 cfs on 05/06/2019
(2) 6,520 cfs on 05/28/2018
(3) 9,590 cfs on 06/06/2017
(4) 6,420 cfs on 04/11/2016
(5) 1,770 cfs on 05/19/2015
(6) 2,040 cfs on 04/09/2014
(7) 1,520 cfs on 05/21/2013
(8) 8,310 cfs on 05/05/2012
Show More Recent Crests

(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

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:15
KML Image
Gauge LocationGauge Map Marker
 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 Collapse
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.
10500 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. The water may affect some residential property near the river, but should stay below the level of most residential structures.
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.
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.
4000 Water will begin seeping onto low spots on the greenbelt path next to the river especially near bridge underpasses. Minor out or bank flow may begin to impact portions of Eagle Island along the south channel.
About This Location Collapse

Latitude: 43.670278° N, Longitude: 116.307500° 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 Not Available Not Available  
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.
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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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