Leonard Johnson
Leonard Johnson is an earth dam located in Modoc County, California, built in 1948. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Leonard Johnson
The primary purpose of Leonard Johnson 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 Russ Ranch Company, Llc (private). It impounds the Dry Creek.
The dam stands 18 feet tall and stretches 720 feet across, creates a reservoir covering 1,125 acres, has a maximum storage capacity of 120 acre-feet, and collects water from a drainage area of 5 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 01/16/2025.
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Location
| State | California |
| County | Modoc |
| River/Stream | Dry Creek |
| Coordinates | 41.64080, -120.40960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 720 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 120 acre-ft |
| Max Storage | 120 acre-ft |
| Surface Area | 1,125 acres |
| Drainage Area | 5 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Russ Ranch Company, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/16/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00492 |
| Federal ID | CA00492 |
| More Info | State Dam Safety Program |