Lorence Lake is an earth dam located in Marion County, Oregon, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 230 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 Lorence Lake
Lorence Lake is a dam in Marion, Oregon. The dam is owned by Greg & Kara Pilcher (private). It impounds the Drift Creek, Trib to near Aurora.
The dam stands 28 feet tall and stretches 230 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1959, 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. The most recent inspection on record was 10/29/2020.
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Location
| State | Oregon |
| County | Marion |
| Nearest City | Aurora |
| River/Stream | Drift Creek, Trib to |
| Coordinates | 44.95064, -122.76516 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 25 ft |
| Dam Length | 230 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 82 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 510 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Greg & Kara Pilcher |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/29/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00384 |
| Federal ID | OR00384 |
| More Info | State Dam Safety Program |