Chapman Lake Dam is a gravity dam located in Spokane County, Washington, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 75 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 Chapman Lake Dam
The primary purpose of Chapman Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jones Trust (private). It impounds the Rock Creek.
The dam stands 18 feet tall and stretches 75 feet across, creates a reservoir covering 150 acres, has a maximum storage capacity of 8,000 acre-feet, and collects water from a drainage area of 48 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 10/27/1993. That was over 32 years ago.
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Location
| State | Washington |
| County | Spokane |
| River/Stream | Rock Creek |
| Coordinates | 47.35612, -117.56745 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 18 ft |
| Dam Length | 75 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 8,000 acre-ft |
| Max Storage | 8,000 acre-ft |
| Normal Storage | 7,500 acre-ft |
| Surface Area | 150 acres |
| Drainage Area | 48 sq mi |
| Max Discharge | 5,000 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jones Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/27/1993 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00303 |
| Federal ID | WA00303 |
| More Info | State Dam Safety Program |