Helms Reservoir
Helms Reservoir is an earth dam located in Linn County, Oregon, built in 1968. It carries a Low hazard potential classification.
About Helms Reservoir
The primary purpose of Helms Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Miller Forests, Inc. (private). It impounds the South Santiam River, Trib To near Jefferson.
The dam stands 27 feet tall and stretches 440 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 120 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1968, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 12/05/2018.
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Location
| State | Oregon |
| County | Linn |
| Nearest City | Jefferson |
| River/Stream | South Santiam River, Trib To |
| Coordinates | 44.69408, -122.95763 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 25 ft |
| Dam Length | 440 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 120 acre-ft |
| Max Storage | 120 acre-ft |
| Normal Storage | 91 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 140 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | MILLER FORESTS, INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 12/05/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00455 |
| Federal ID | OR00455 |
| More Info | State Dam Safety Program |