Devil Canyon Second Afterbay
Devil Canyon Second Afterbay is an earth dam located in San Bernardino County, California, built in 1995. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Devil Canyon Second Afterbay
The primary purpose of Devil Canyon Second Afterbay 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 California Department Of Water Resources (state). It impounds the Devil Canyon Creek near San Bernardino.
The dam stands 88 feet tall and stretches 106 feet across, creates a reservoir covering 36 acres, has a maximum storage capacity of 960 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1995, the structure is 31 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. The most recent inspection on record was 05/09/2025.
At 88 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 | San Bernardino |
| Nearest City | San Bernardino |
| River/Stream | Devil Canyon Creek |
| Coordinates | 34.20418, -117.33538 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 88 ft |
| Dam Height | 40 ft |
| Dam Length | 106 ft |
| Year Completed | 1995 (31 years old) |
Storage & Hydraulics
| NID Storage | 960 acre-ft |
| Max Storage | 960 acre-ft |
| Normal Storage | 850 acre-ft |
| Surface Area | 36 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 2,960 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | California Department of Water Resources |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/09/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA01364 |
| Federal ID | CA01364 |
| More Info | State Dam Safety Program |