Boise River at Eagle Island

1. 16600.0 ftMajor 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.
2. 13000.0 ftFlooding 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.
3. 11000.0 ftFlooding 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.
4. 9500.0 ftFlooding 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.
5. 8900.0 ftLarge 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.
6. 8500.0 ftLarge 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.
7. 7000.0 ftLarge 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.
8. 6500.0 ftLarge sections of the greenbelt path adjacent to the river will be submerged. Minor flooding may affect portions of Eagle Island.
9. 4900.0 ftWater will cover low sections of the greenbelt path.
10. 4200.0 ftWater 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.

Most recent crests

• May 6, 2019: 10.01 ft
• May 28, 2018: 9.71 ft
• June 6, 2017: 11.93 ft
• April 11, 2016: 9.98 ft
• May 19, 2015: 6.42 ft
• April 9, 2014: 6.68 ft
• May 21, 2013: 6.39 ft
• May 5, 2012: 10.93 ft
• May 18, 2011: 10.07 ft
• June 11, 2010: 9.72 ft

• UpstreamBoise River at Boise (Glenwood Bridge)
• DownstreamBoise River at South Channel at Eagle
• New York Canal Diversion at Boise
• Boise River at Middleton
• Boise River at Diversion Dam
• Mores Creek at Robie Creek
• Boise River at Lucky Peak Dam
• Payette River at Emmett

Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.