Trillium Lake
Trillium Lake is an earth dam located in Clackamas County, Oregon, built in 1960. It carries a Low hazard potential classification.
About Trillium Lake
The primary purpose of Trillium Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Oregon Department Of Fish And Wildlife (state). It impounds the Mud Creek near Welches.
The dam stands 21 feet tall and stretches 985 feet across, creates a reservoir covering 65 acres, has a maximum storage capacity of 380 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1960, 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 06/12/2019.
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Location
| State | Oregon |
| County | Clackamas |
| Nearest City | Welches |
| River/Stream | Mud Creek |
| Coordinates | 45.26731, -121.74231 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 19 ft |
| Dam Length | 985 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 380 acre-ft |
| Max Storage | 380 acre-ft |
| Normal Storage | 353 acre-ft |
| Surface Area | 65 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 450 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | OREGON DEPARTMENT OF FISH AND WILDLIFE |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 06/12/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00350 |
| Federal ID | OR00350 |
| More Info | State Dam Safety Program |