Lake County Sanitation District 2
Lake County Sanitation District 2 is an earth dam located in Lake County, California, built in 1976. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lake County Sanitation District 2
The primary purpose of Lake County Sanitation District 2 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 Lake County Sanitation District (local government). It impounds the Tr Lyons Creek near North Lakeport.
The dam stands 77 feet tall and stretches 650 feet across, creates a reservoir covering 34 acres, has a maximum storage capacity of 870 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1976, the structure is 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/23/2025.
At 77 feet, this dam is taller than 97% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | Lake |
| Nearest City | North Lakeport |
| River/Stream | Tr Lyons Creek |
| Coordinates | 39.11570, -122.92170 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 77 ft |
| Dam Height | 77 ft |
| Dam Length | 650 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 870 acre-ft |
| Max Storage | 870 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lake County Sanitation District |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/23/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01108 |
| Federal ID | CA01108 |
| More Info | State Dam Safety Program |