Chapman Upper
Chapman Upper is an earth dam located in Malheur County, Oregon, built in 1948. It carries a Low hazard potential classification.
About Chapman Upper
The primary purpose of Chapman Upper is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Second Oregon, Llc (private). It impounds the Granite Creek, Trib To near Riverside.
The dam stands 15 feet tall and stretches 850 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 500 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1948, 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 05/19/2016.
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Location
| State | Oregon |
| County | Malheur |
| Nearest City | Riverside |
| River/Stream | Granite Creek, Trib To |
| Coordinates | 43.47026, -118.03582 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 850 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 500 acre-ft |
| Max Storage | 500 acre-ft |
| Normal Storage | 223 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 95 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | SECOND OREGON, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 05/19/2016 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR00176 |
| Federal ID | OR00176 |
| More Info | State Dam Safety Program |