Merwin Reservoir #2 is an earth dam located in Crook County, Oregon, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 74 ft74 ft tall and 850 ft long, taller than 97% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Merwin Reservoir #2
The primary purpose of Merwin Reservoir #2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hamilton Ranch (private). It impounds the Watson Creek near Post.
The dam stands 74 feet tall and stretches 850 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 174 acre-feet, and collects water from a drainage area of 27 square miles. Completed in 1968, 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 02/27/2020.
At 74 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Oregon |
| County | Crook |
| Nearest City | Post |
| River/Stream | Watson Creek |
| Coordinates | 44.13840, -120.11732 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 74 ft |
| Dam Height | 48 ft |
| Dam Length | 850 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 174 acre-ft |
| Max Storage | 174 acre-ft |
| Normal Storage | 174 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 3,000 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Hamilton Ranch |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 02/27/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00397 |
| Federal ID | OR00397 |
| More Info | State Dam Safety Program |