Sly Park
Sly Park is an earth dam located in El Dorado County, California, built in 1955. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Sly Park
The primary purpose of Sly Park 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 El Dorado Irrigation District (public utility). It impounds the Sly Park Creek near Rancho Murieta.
The dam stands 182 feet tall and stretches 760 feet across, creates a reservoir covering 677 acres, has a maximum storage capacity of 41,000 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1955, the structure is well into its service life at over 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 03/05/2025.
At 182 feet, this dam is taller than 99% 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 | El Dorado |
| Nearest City | Rancho Murieta |
| River/Stream | Sly Park Creek |
| Coordinates | 38.71590, -120.56260 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 182 ft |
| Dam Height | 182 ft |
| Dam Length | 760 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 41,000 acre-ft |
| Max Storage | 41,000 acre-ft |
| Surface Area | 677 acres |
| Drainage Area | 17 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | El Dorado Irrigation District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/05/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01523 |
| Federal ID | CA01523 |
| More Info | State Dam Safety Program |