Day Creek Debris Basin
Day Creek Debris Basin is an earth dam located in San Bernardino County, California, built in 1988. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Day Creek Debris Basin
The primary purpose of Day Creek Debris Basin is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by County Of San Bernardino Department Of Public Works (local government). It impounds the Day Creek near Rancho Cucamonga.
The dam stands 90 feet tall and stretches 975 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1988, the structure is 38 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 03/10/2025.
At 90 feet, this dam is taller than 98% 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 | Rancho Cucamonga |
| River/Stream | Day Creek |
| Coordinates | 34.17610, -117.54320 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 90 ft |
| Dam Height | 90 ft |
| Dam Length | 975 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 5 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | County of San Bernardino Department of Public Works |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/10/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01232 |
| Federal ID | CA01232 |
| More Info | State Dam Safety Program |