Graham
Graham is an earth dam located in Lake County, California, built in 1959. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Graham
The primary purpose of Graham 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 Matthew G. Boyer (private). It impounds the Tr Hland Cr.
The dam stands 39 feet tall and stretches 220 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 62 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1959, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/21/2025.
At 39 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | California |
| County | Lake |
| River/Stream | Tr Hland Cr |
| Coordinates | 38.96830, -122.94590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 220 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Matthew G. Boyer |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/21/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00570 |
| Federal ID | CA00570 |
| More Info | State Dam Safety Program |