Upper Pasture
Upper Pasture is an earth dam located in Modoc County, California. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Upper Pasture
The primary purpose of Upper Pasture is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Wilson Ranches (private). It impounds the Yankee Jim Sl.
The dam stands 15 feet tall and stretches 1,100 feet across, creates a reservoir covering 50 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 5 square miles.
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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/19/2025.
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Location
| State | California |
| County | Modoc |
| River/Stream | Yankee Jim Sl |
| Coordinates | 41.42730, -120.46580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 1,100 ft |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 5 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Wilson Ranches |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/19/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00488 |
| Federal ID | CA00488 |
| More Info | State Dam Safety Program |