Three Mile Falls Diversion
Three Mile Falls Diversion is a concrete dam located in Umatilla County, Oregon, built in 1913. It carries a Low hazard potential classification.
About Three Mile Falls Diversion
The primary purpose of Three Mile Falls Diversion is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau Of Reclamation (federal). It impounds the Umatilla River near Umatilla.
The dam stands 28 feet tall and stretches 915 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 1,280 square miles. Completed in 1913, the structure is over a century 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 07/30/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oregon |
| County | Umatilla |
| Nearest City | Umatilla |
| River/Stream | Umatilla River |
| Coordinates | 45.88220, -119.32450 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 915 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 1,280 sq mi |
| Max Discharge | 38,000 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 07/30/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00588 |
| Federal ID | OR00588 |
| More Info | State Dam Safety Program |