Rainbow Lake Dam is a gravity dam located in Columbia County, Washington, built in 1955. It carries a Low hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 1,700 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Rainbow Lake Dam
The primary purpose of Rainbow Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Wa Dfw (state). It impounds the Tucannon River-offstream.
The dam stands 14 feet tall and stretches 1,700 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1955, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 05/15/1998. That was over 28 years ago.
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Location
| State | Washington |
| County | Columbia |
| River/Stream | Tucannon River-offstream |
| Coordinates | 46.31470, -117.66075 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 14 ft |
| Dam Length | 1,700 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Wa Dfw |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/15/1998 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00319 |
| Federal ID | WA00319 |
| More Info | State Dam Safety Program |