S-x is an earth dam located in Modoc County, California, built in 1917. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 45 ft45 ft tall and 650 ft long, taller than 90% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About S-x
The primary purpose of S-x 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 Lazy Spade, LLC (private). It impounds the Tr Pit River.
The dam stands 45 feet tall and stretches 650 feet across, creates a reservoir covering 330 acres, has a maximum storage capacity of 4,225 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1917, the structure is over a century 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/06/2025.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | California |
| County | Modoc |
| River/Stream | Tr Pit River |
| Coordinates | 41.51250, -120.74890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 650 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 4,225 acre-ft |
| Max Storage | 4,225 acre-ft |
| Surface Area | 330 acres |
| Drainage Area | 12 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lazy Spade, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/06/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00461 |
| Federal ID | CA00461 |
| More Info | State Dam Safety Program |