Portland #6 (mt.tabor) is an earth dam located in Multnomah County, Oregon, built in 1911. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 28 ft28 ft tall and 1,400 ft long, taller than 62% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Portland #6 (mt.tabor)
The primary purpose of Portland #6 (mt.tabor) 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 City of Portland #6 (local government). It impounds the Bull Run River (offstream) near Portland.
The dam stands 28 feet tall and stretches 1,400 feet across, creates a reservoir covering 12 acres, and has a maximum storage capacity of 230 acre-feet. Completed in 1911, the structure is over a century 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 08/06/2020.
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 Oregon 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 | Oregon |
| County | Multnomah |
| Nearest City | Portland |
| River/Stream | Bull Run River (offstream) |
| Coordinates | 45.51123, -122.59998 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 1,400 ft |
| Year Completed | 1911 (115 years old) |
Storage & Hydraulics
| NID Storage | 230 acre-ft |
| Max Storage | 230 acre-ft |
| Normal Storage | 230 acre-ft |
| Surface Area | 12 acres |
| Max Discharge | 30 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Portland #6 |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/06/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OR00671 |
| Federal ID | OR00671 |
| More Info | State Dam Safety Program |