Graven
Graven 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.
About Graven
The primary purpose of Graven 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 Ray Anklin (private). It impounds the Tr Canyon Creek.
The dam stands 15 feet tall and stretches 1,630 feet across, creates a reservoir covering 214 acres, has a maximum storage capacity of 1,100 acre-feet, and collects water from a drainage area of 6 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 09/23/2025.
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Location
| State | California |
| County | Modoc |
| River/Stream | Tr Canyon Creek |
| Coordinates | 41.28830, -120.67080 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 1,630 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 1,100 acre-ft |
| Max Storage | 1,100 acre-ft |
| Surface Area | 214 acres |
| Drainage Area | 6 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Ray Anklin |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/23/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00472 |
| Federal ID | CA00472 |
| More Info | State Dam Safety Program |