Magic Mountain #1
Magic Mountain #1 is an earth dam located in Jefferson County, Colorado, built in 1958. It carries a High hazard potential classification.
About Magic Mountain #1
The primary purpose of Magic Mountain #1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Martin Marietta Materials (courtney, Phillip) (private). It impounds the Jackson Gulch near Pleasant View.
The dam stands 56 feet tall and stretches 800 feet across, creates a reservoir covering 7 acres, and has a maximum storage capacity of 189 acre-feet. Completed in 1958, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 12/21/2022.
At 56 feet, this dam is taller than 94% 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 | Jefferson |
| Nearest City | Pleasant View |
| River/Stream | Jackson Gulch |
| Coordinates | 39.71168, -105.20891 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 51 ft |
| Dam Length | 800 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 189 acre-ft |
| Max Storage | 189 acre-ft |
| Normal Storage | 145 acre-ft |
| Surface Area | 7 acres |
| Max Discharge | 5,372 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | MARTIN MARIETTA MATERIALS (COURTNEY, PHILLIP) |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 12/21/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00201 |
| Federal ID | CO00201 |
| More Info | State Dam Safety Program |