Stewart Gulch Main Fork
Stewart Gulch Main Fork is a dam located in Ada County, Idaho, built in 1998. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Stewart Gulch Main Fork
The primary purpose of Stewart Gulch Main Fork is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is local government-owned. It impounds the Stewart Creek Boise River near Boise.
The dam stands 76 feet tall and stretches 570 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 61 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1998, the structure is 28 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 11/20/2018.
At 76 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Idaho |
| County | Ada |
| Nearest City | Boise |
| River/Stream | Stewart Creek Boise River |
| Coordinates | 43.67710, -116.18360 |
Physical Characteristics
| NID Height | 76 ft |
| Dam Height | 76 ft |
| Dam Length | 570 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 61 acre-ft |
| Max Storage | 61 acre-ft |
| Normal Storage | 61 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 168 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/20/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00480 |
| Federal ID | ID00480 |
| More Info | State Dam Safety Program |