Loch Lomond
Loch Lomond is an earth dam located in Clear Creek County, Colorado, built in 1963. It carries a High hazard potential classification and has a fair condition assessment.
About Loch Lomond
The primary purpose of Loch Lomond is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Agricultural Ditch & Reservoir Company (acker, Pet (private). It impounds the Fall River-tr near Idaho Springs.
The dam stands 45 feet tall and stretches 875 feet across, creates a reservoir covering 31 acres, has a maximum storage capacity of 1,058 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1963, the structure is well into its service life at over 50 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/12/2022.
At 45 feet, this dam is taller than 91% of dams nationwide.
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 Colorado 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 | Colorado |
| County | Clear Creek |
| Nearest City | Idaho Springs |
| River/Stream | Fall River-tr |
| Coordinates | 39.83371, -105.67583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 42 ft |
| Dam Length | 875 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 1,058 acre-ft |
| Max Storage | 1,058 acre-ft |
| Normal Storage | 875 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | AGRICULTURAL DITCH & RESERVOIR COMPANY (ACKER, PET |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 08/12/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00199 |
| Federal ID | CO00199 |
| More Info | State Dam Safety Program |