Ross No. 1
Ross No. 1 is an earth dam located in Shasta County, California, built in 1957. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Ross No. 1
The primary purpose of Ross No. 1 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 The Mcconnell Foundation (private). It impounds the Tr Stillwater Cr.
The dam stands 30 feet tall and stretches 740 feet across, creates a reservoir covering 53 acres, has a maximum storage capacity of 709 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1957, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. 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 04/21/2025.
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Location
| State | California |
| County | Shasta |
| River/Stream | Tr Stillwater Cr |
| Coordinates | 40.64190, -122.31550 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 740 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 709 acre-ft |
| Max Storage | 709 acre-ft |
| Surface Area | 53 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | The McConnell Foundation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/21/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00934 |
| Federal ID | CA00934 |
| More Info | State Dam Safety Program |