Ada County, Idaho

The Boise River remained in flood during the entire month of May due to planned release from Lucky Peak dam. Regulated flows were above flood stage for 101 days resulting in extensive damage to the Greenbelt and Nature Trail paths. Extensive flood fight efforts continued in the Eagle Island area to prevent a pit capture. Widespread flooding continued on Eagle Island in the Riviera Estates area where several homes were surrounded by water and low lying roads were inundated. Large portions of Ann Morrison Park, Barber Park, and Marianne Williams Park were impacted by flood waters. Some residential streets continued to be impacted by flood waters, especially in the Garden City Warehouse District and on Eagle Island. A pit capture occurred just downstream of Eagle Island causing a major shift in the river channel. Streets in the Stonebriar development just downstream of the Highway 16 bridge were inundated by water. Severe bank erosion and large trees washed into the river caused problems in the river channel and at some bridge crossings.

Planned releases from Lucky Peak Reservoir for flood control ranged from 7800 CFS to 8900 CFS during the month of April. The prolonged flood flows continued to cause extensive damage to the Greenbelt and Nature Trail paths. Flood waters inundated portions of Eagle Island, particularly along Artesian Road and Hatchery Road. Numerous homes in Riviera Estates were surrounded by water. Flood fight efforts continued to focus in the Eagle Island area with extensive sandbagging taking place. Additional flood fight efforts to mitigate a pit capture continued along the Eagle Island south channel of the river. Flood diversion tubes and muscle wall barriers were used to limit river encroachment on the sandpit. Large sections of Ann Morrison Park, Marianne Williams Park, and Barber Park were flooded. Some residential streets adjacent to the river had water on them, especially in the Garden City Warehouse District.

The Army Corps of Engineers and Bureau of Reclamation increased regulated flows from Lucky Peak Reservoir putting the Boise River in flood for the remainder of the month of March. Flooding was expected to continue through late spring. Flood flows for the extended period caused significant damage to much of the Greenbelt and Nature Trail paths along the river. Flood fight efforts were focused in the Eagle Island area where severe bank erosion occurred and a pit capture threat existed. A HESCO barrier wall and extensive sandbagging occurred in the area to mitigate a pit capture.