Boise River at Eagle Island
Idaho — Water Level & Flood Stage
Located in Ada County, Idaho on the Boise River. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: EAGI1). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
12.9 ft
15,000 cfs
Moderate Flood
12.7 ft
11,000 cfs
Minor Flood
10.1 ft
7,000 cfs
Action Stage
9.7 ft
6,500 cfs
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
16600 ft
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.
13000 ft
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.
11000 ft
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 will be limited by high water.
9500 ft
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 ft
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. Some residential areas near Eagle Island State Park will become inundated.
8500 ft
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 ft
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 ft
Large sections of the greenbelt path adjacent to the river will be submerged. Minor flooding may affect portions of Eagle Island.
4900 ft
Water will cover low sections of the greenbelt path.
4200 ft
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.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 5, 2017 | 11.93 ft | 9,590 cfs |
| Jun 5, 2017 | 11.93 ft | 9,590 cfs |
| Jun 12, 1983 | 11.54 ft | 9,840 cfs |
| Jun 12, 1983 | 11.54 ft | 9,840 cfs |
| May 30, 1998 | 11.1 ft | 8,350 cfs |
Flood Inundation Map
NOAA has mapped what areas flood at different water levels for this gauge. View the interactive flood inundation map →
About This Gauge
NWS LID
EAGI1
River
Boise River
County
Ada, ID
Coordinates
43.6703°N, 116.3075°W
Get Flood Alerts for Boise River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Boise River at Eagle Island?
The Boise River at Eagle Island gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Boise River at Eagle Island?
The NWS-defined flood stage for Boise River at Eagle Island is 10.1 feet. Action stage begins at 9.7 feet. Moderate flooding starts at 12.7 feet, and major flooding at 12.9 feet.
How do I get alerts when Boise River rises?
Download StormCast free on Google Play, go to River Gauges, and add Boise River at Eagle Island to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Boise River at Eagle Island gauge located?
The gauge is located in Ada County, Idaho at coordinates 43.6703°N, 116.3075°W. Data is provided by the U.S. Geological Survey and the National Weather Service.