Hidden Lake
Hidden Lake is an earth dam located in Adams County, Colorado, built in 1958. It carries a Low hazard potential classification and has a fair condition assessment.
About Hidden Lake
The primary purpose of Hidden Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mayham Reservoir Company (gillis, Jason) (private). It impounds the Clear Creek-os near Westminster.
The dam stands 14 feet tall and stretches 202 feet across, creates a reservoir covering 111 acres, has a maximum storage capacity of 650 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1958, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/11/2018.
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Location
| State | Colorado |
| County | Adams |
| Nearest City | Westminster |
| River/Stream | Clear Creek-os |
| Coordinates | 39.81854, -105.03620 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 10 ft |
| Dam Length | 202 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 650 acre-ft |
| Max Storage | 650 acre-ft |
| Normal Storage | 270 acre-ft |
| Surface Area | 111 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 3,600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MAYHAM RESERVOIR COMPANY (GILLIS, JASON) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/11/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00200 |
| Federal ID | CO00200 |
| More Info | State Dam Safety Program |