Boise River at Boise (Glenwood Bridge)

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. Park Center Boulevard in southeast Boise will be flooded near the Park Center Pond.
3. 11000.0 ftFlooding over Park Center Boulevard in southeast Boise near the Park Center Pond will occur. Flooding will occur in Municiple Park. 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.
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. Water will cover portions of Warm Springs Golf Course in east Boise. The water may affect some residential property near the river, but should stay below the level of most residential structures. The river will spill over its banks between 45th and 47th Street in Garden City into the warehouse district.
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. Water will seep into the Garden City warehouse district between 45th and 47th streets. Flooding will impact portions of Marianne Williams Park in east Boise.
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 and Bethine Church River Trail adjacent to the river.
10. 4200.0 ftWater will begin seeping onto low spots on the greenbelt path next to the river especially near bridge underpasses, and onto portions of the Bethine Church River Trail.

Most recent crests

• March 28, 2025: 8.53 ft
• April 23, 2024: 8.22 ft
• May 8, 2023: 9.80 ft
• June 16, 2022: 7.14 ft
• June 14, 2022: 7.14 ft
• May 22, 2021: 6.52 ft
• April 30, 2020: 5.12 ft
• May 6, 2019: 10.01 ft
• May 28, 2018: 9.71 ft
• June 6, 2017: 11.93 ft

• UpstreamBoise River at Diversion Dam
• DownstreamBoise River at Eagle Island
• Boise River at South Channel at Eagle
• New York Canal Diversion at Boise
• Mores Creek at Robie Creek
• Boise River at Lucky Peak Dam
• Boise River at Middleton
• Southwest Idaho Reservoirs at Arrowrock Dam

Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round. Stage may be affected by ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.