Thompson No 2 is a dam located in Clearwater County, Idaho, built in 1970. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 19 ft19 ft tall and 480 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Thompson No 2
The primary purpose of Thompson No 2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is private-owned. It impounds the Spring Clearwater River.
The dam stands 19 feet tall and stretches 480 feet across, creates a reservoir covering 2 acres, has a storage capacity of 14 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1970, the structure is well into its service life at over 50 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/18/2016.
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Location
| State | Idaho |
| County | Clearwater |
| River/Stream | Spring Clearwater River |
| Coordinates | 46.49420, -116.36310 |
Physical Characteristics
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 480 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 14 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/18/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00597 |
| Federal ID | ID00597 |
| More Info | State Dam Safety Program |