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Hydrograph River at a Glance Download Inundation
Mapping
Boise River at Eagle Island River Discharge (cfs)Stage (ft)Observed: 271 cfs at 11:15PM Oct 20, 2020Observed: 271 cfs at 11:30PM Oct 20, 2020Observed: 274 cfs at 11:45PM Oct 20, 2020Observed: 274 cfs at 12:00AM Oct 21, 2020Highest Observation: 277 cfs at 12:15AM Oct 21, 2020Highest Observation: 277 cfs at 12:30AM Oct 21, 2020Highest Observation: 277 cfs at 12:45AM Oct 21, 2020Highest Observation: 277 cfs at 1:00AM Oct 21, 2020Highest Observation: 277 cfs at 1:15AM Oct 21, 2020Observed: 274 cfs at 1:30AM Oct 21, 2020Observed: 271 cfs at 1:45AM Oct 21, 2020Observed: 268 cfs at 2:00AM Oct 21, 2020Observed: 271 cfs at 2:15AM Oct 21, 2020Highest Observation: 277 cfs at 2:30AM Oct 21, 2020Observed: 274 cfs at 2:45AM Oct 21, 2020Observed: 271 cfs at 5:00AM Oct 21, 2020Observed: 268 cfs at 5:15AM Oct 21, 2020Observed: 265 cfs at 5:30AM Oct 21, 2020Observed: 268 cfs at 5:45AM Oct 21, 2020Observed: 268 cfs at 8:00AM Oct 21, 2020Observed: 271 cfs at 8:15AM Oct 21, 2020Observed: 271 cfs at 8:30AM Oct 21, 2020Observed: 274 cfs at 8:45AM Oct 21, 2020Observed: 271 cfs at 9:00AM Oct 21, 2020Observed: 268 cfs at 9:15AM Oct 21, 2020Observed: 268 cfs at 9:30AM Oct 21, 2020Observed: 268 cfs at 9:45AM Oct 21, 2020Observed: 274 cfs at 11:00AM Oct 21, 2020Observed: 274 cfs at 11:15AM Oct 21, 2020Observed: 274 cfs at 11:30AM Oct 21, 2020Observed: 274 cfs at 11:45AM Oct 21, 2020Observed: 271 cfs at 2:00PM Oct 21, 2020Observed: 271 cfs at 2:15PM Oct 21, 2020Observed: 271 cfs at 2:30PM Oct 21, 2020Observed: 271 cfs at 2:45PM Oct 21, 2020Observed: 271 cfs at 4:00PM Oct 21, 2020Observed: 271 cfs at 4:15PM Oct 21, 2020Observed: 268 cfs at 4:30PM Oct 21, 2020Observed: 268 cfs at 4:45PM Oct 21, 2020Observed: 271 cfs at 7:00PM Oct 21, 2020Observed: 271 cfs at 7:15PM Oct 21, 2020Observed: 265 cfs at 7:30PM Oct 21, 2020Observed: 265 cfs at 7:45PM Oct 21, 2020Observed: 265 cfs at 8:00PM Oct 21, 2020Observed: 268 cfs at 8:15PM Oct 21, 2020Observed: 268 cfs at 8:30PM Oct 21, 2020Observed: 271 cfs at 8:45PM Oct 21, 2020Observed: 265 cfs at 10:00PM Oct 21, 2020Observed: 265 cfs at 10:15PM Oct 21, 2020Observed: 265 cfs at 10:30PM Oct 21, 2020Observed: 268 cfs at 10:45PM Oct 21, 2020Observed: 265 cfs at 11:15PM Oct 21, 2020Observed: 265 cfs at 11:30PM Oct 21, 2020Observed: 268 cfs at 11:45PM Oct 21, 2020Observed: 265 cfs at 1:00AM Oct 22, 2020Observed: 268 cfs at 1:15AM Oct 22, 2020Observed: 268 cfs at 1:30AM Oct 22, 2020Observed: 265 cfs at 1:45AM Oct 22, 2020Observed: 255 cfs at 2:00AM Oct 22, 2020Observed: 265 cfs at 2:15AM Oct 22, 2020Observed: 265 cfs at 2:30AM Oct 22, 2020Observed: 258 cfs at 2:45AM Oct 22, 2020Observed: 265 cfs at 4:00AM Oct 22, 2020Observed: 268 cfs at 4:15AM Oct 22, 2020Observed: 265 cfs at 4:30AM Oct 22, 2020Observed: 258 cfs at 4:45AM Oct 22, 2020Observed: 265 cfs at 5:00AM Oct 22, 2020Observed: 268 cfs at 5:15AM Oct 22, 2020Observed: 265 cfs at 5:30AM Oct 22, 2020Observed: 265 cfs at 5:45AM Oct 22, 2020Observed: 265 cfs at 7:00AM Oct 22, 2020Observed: 258 cfs at 7:15AM Oct 22, 2020Observed: 261 cfs at 7:30AM Oct 22, 2020Observed: 268 cfs at 7:45AM Oct 22, 2020Forecast: 246 cfs 12:00PM Oct 23, 2020Forecast: 246 cfs 6:00PM Oct 23, 2020Forecast: 249 cfs 12:00AM Oct 24, 2020Forecast: 249 cfs 6:00AM Oct 24, 2020Forecast: 249 cfs 12:00PM Oct 24, 2020Forecast: 252 cfs 6:00PM Oct 24, 2020Forecast: 252 cfs 12:00AM Oct 25, 2020Highest Forecast: 255 cfs 6:00AM Oct 25, 2020Highest Forecast: 255 cfs 12:00PM Oct 25, 2020Forecast: 252 cfs 6:00PM Oct 25, 2020Forecast: 252 cfs 12:00AM Oct 26, 2020Forecast: 252 cfs 6:00AM Oct 26, 2020Forecast: 252 cfs 12:00PM Oct 26, 2020Forecast: 252 cfs 6:00PM Oct 26, 2020Forecast: 252 cfs 12:00AM Oct 27, 2020Forecast: 252 cfs 6:00AM Oct 27, 2020Forecast: 252 cfs 12:00PM Oct 27, 2020Forecast: 252 cfs 6:00PM Oct 27, 2020Forecast: 252 cfs 12:00AM Oct 28, 2020Forecast: 249 cfs 6:00AM Oct 28, 2020Forecast: 249 cfs 12:00PM Oct 28, 2020Forecast: 249 cfs 6:00PM Oct 28, 2020Forecast: 249 cfs 12:00AM Oct 29, 2020Forecast: 249 cfs 6:00AM Oct 29, 2020Forecast: 249 cfs 12:00PM Oct 29, 2020Forecast: 249 cfs 6:00PM Oct 29, 2020Forecast: 249 cfs 12:00AM Oct 30, 2020Forecast: 249 cfs 6:00AM Oct 30, 2020EAGI1(plotting QRIRZ) Graph Created (6:00AM Oct 23, 2020)ObservedForecast (issued 3:29PM Oct 22)Latest observed value: 268 cfs at 7:45 AM MDT 22-Oct-2020. Flood Flow is 7 kcfs
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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.

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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) 4.43 ft on 10/26/1983
(2) 4.43 ft on 10/18/1990
(3) 4.43 ft on 10/05/1989
Show More Low Water Records

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

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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.
8500 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.
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.
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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.
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: 1-Mar-2019 12:33 AM
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